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Open Altimeter Database (OpenADB)

Deutsches Geodätisches Forschungsinstitut

Technische Universität München

Parameter-Documentation


{'id': 16, 'name': 'instr', 'num_parameter': 9, 'size_bytes': 22}
Version 00

CryoSat-2 (Extended Mission) | GOP | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
4 +2 -3 m stdalt RMS of Altimeter Range
5 2 -2 m swh Significant Wave Height
6 +2 -2 m stdswh RMS of Significant Wave Height
7 +2 -2 db sigma0 Backscatter Coefficient
8 +1 -1 m/s windsp Wind Speed
9 +1 - - iflags Instrument Status and Quality Flags

CryoSat-2 | GOP | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
4 +2 -3 m stdalt RMS of Altimeter Range
5 2 -2 m swh Significant Wave Height
6 +2 -2 m stdswh RMS of Significant Wave Height
7 +2 -2 db sigma0 Backscatter Coefficient
8 +1 -1 m/s windsp Wind Speed
9 +1 - - iflags Instrument Status and Quality Flags

ERS-1 (Phase A) | SGDR/REAPER | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: ocean_range
4 +2 -3 m stdalt RMS of Altimeter Range
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: ocean_range_rms
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: ocean_sig0
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ocean_range_numval, stdalt, ralt
Flags:
2: swh == 0 or swh_rms/swh > 0.1
8: ocean_range_numval < 12 || ocean_range_numval > 20
128 : stdalt = nan || ralt == nan

ERS-1 (Phase A) | SGDR/REAPER | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: ocean_range_20hz
4 +2 -3 m stdalt RMS of Altimeter Range
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: ocean_range_rms
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh_20hz
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: ocean_sig0_20hz
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ocean_range_numval, stdalt, ralt
Flags:
2: swh == 0 or swh_rms/swh > 0.1
8: ocean_range_numval < 12 || ocean_range_numval > 20
128 : stdalt = nan || ralt == nan

ERS-1 (Phase B) | SGDR/REAPER | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: ocean_range
4 +2 -3 m stdalt RMS of Altimeter Range
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: ocean_range_rms
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: ocean_sig0
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ocean_range_numval, stdalt, ralt
Flags:
2: swh == 0 or swh_rms/swh > 0.1
8: ocean_range_numval < 12 || ocean_range_numval > 20
128 : stdalt = nan || ralt == nan

ERS-1 (Phase B) | SGDR/REAPER | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: ocean_range_20hz
4 +2 -3 m stdalt RMS of Altimeter Range
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: ocean_range_rms
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh_20hz
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: ocean_sig0_20hz
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ocean_range_numval, stdalt, ralt
Flags:
2: swh == 0 or swh_rms/swh > 0.1
8: ocean_range_numval < 12 || ocean_range_numval > 20
128 : stdalt = nan || ralt == nan

ERS-1 (Phase C) | SGDR/REAPER | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
4 +2 -3 m stdalt RMS of Altimeter Range
5 2 -2 m swh Significant Wave Height
6 +2 -2 m stdswh RMS of Significant Wave Height
7 +2 -2 db sigma0 Backscatter Coefficient
8 +1 -1 m/s windsp Wind Speed
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ocean_range_numval, ocean_range, ocean_range_rms
Flags:
2 : swh_ku == 0 || swh_rms_ku/swh_ku > 0.1
8 : ocean_range_numval < 12
128 : range_ku == nan || range_rms_ku == nan

ERS-1 (Phase C) | SGDR/REAPER | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: ocean_range_20hz
4 +2 -3 m stdalt RMS of Altimeter Range
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: ocean_range_rms
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh_20hz
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: ocean_sig0_20hz
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ocean_range_numval, stdalt, ralt
Flags:
2: swh == 0 or swh_rms/swh > 0.1
8: ocean_range_numval < 12 || ocean_range_numval > 20
128 : stdalt = nan || ralt == nan

ERS-1 (Phase D) | SGDR/REAPER | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: ocean_range
4 +2 -3 m stdalt RMS of Altimeter Range
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: ocean_range_rms
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: ocean_sig0
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ocean_range_numval, ocean_range, ocean_range_rms
Flags:
2 : swh_ku == 0 || swh_rms_ku/swh_ku > 0.1
8 : ocean_range_numval < 12
128 : range_ku == nan || range_rms_ku == nan

ERS-1 (Phase D) | SGDR/REAPER | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: ocean_range_20hz
4 +2 -3 m stdalt RMS of Altimeter Range
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: ocean_range_rms
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh_20hz
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: ocean_sig0_20hz
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ocean_range_numval, stdalt, ralt
Flags:
2: swh == 0 or swh_rms/swh > 0.1
8: ocean_range_numval < 12 || ocean_range_numval > 20
128 : stdalt = nan || ralt == nan

ERS-1 (Phase E) | SGDR/REAPER | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: ocean_range
4 +2 -3 m stdalt RMS of Altimeter Range
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: ocean_range_rms
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: ocean_sig0
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ocean_range_numval, ocean_range, ocean_range_rms
Flags:
2 : swh_ku == 0 || swh_rms_ku/swh_ku > 0.1
8 : ocean_range_numval < 12
128 : range_ku == nan || range_rms_ku == nan

ERS-1 (Phase E) | SGDR/REAPER | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: ocean_range_20hz
4 +2 -3 m stdalt RMS of Altimeter Range
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: ocean_range_rms
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh_20hz
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: ocean_sig0_20hz
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ocean_range_numval, stdalt, ralt
Flags:
2: swh == 0 or swh_rms/swh > 0.1
8: ocean_range_numval < 12 || ocean_range_numval > 20
128 : stdalt = nan || ralt == nan

ERS-1 (Phase F) | SGDR/REAPER | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: ocean_range
4 +2 -3 m stdalt RMS of Altimeter Range
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: ocean_range_rms
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: ocean_sig0
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ocean_range_numval, ocean_range, ocean_range_rms
Flags:
2 : swh_ku == 0 || swh_rms_ku/swh_ku > 0.1
8 : ocean_range_numval < 12
128 : range_ku == nan || range_rms_ku == nan

ERS-1 (Phase F) | SGDR/REAPER | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: ocean_range_20hz
4 +2 -3 m stdalt RMS of Altimeter Range
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: ocean_range_rms
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh_20hz
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: ocean_sig0_20hz
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ocean_range_numval, stdalt, ralt
Flags:
2: swh == 0 or swh_rms/swh > 0.1
8: ocean_range_numval < 12 || ocean_range_numval > 20
128 : stdalt = nan || ralt == nan

ERS-1 (Phase G) | SGDR/REAPER | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: ocean_range
4 +2 -3 m stdalt RMS of Altimeter Range
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: ocean_range_rms
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: ocean_sig0
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ocean_range_numval, ocean_range, ocean_range_rms
Flags:
2 : swh_ku == 0 || swh_rms_ku/swh_ku > 0.1
8 : ocean_range_numval < 12
128 : range_ku == nan || range_rms_ku == nan

ERS-1 (Phase G) | SGDR/REAPER | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: ocean_range_20hz
4 +2 -3 m stdalt RMS of Altimeter Range
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: ocean_range_rms
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh_20hz
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: ocean_sig0_20hz
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ocean_range_numval, stdalt, ralt
Flags:
2: swh == 0 or swh_rms/swh > 0.1
8: ocean_range_numval < 12 || ocean_range_numval > 20
128 : stdalt = nan || ralt == nan

ERS-2 | SGDR/REAPER | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: ocean_range
4 +2 -3 m stdalt RMS of Altimeter Range
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: ocean_range_rms
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: ocean_sig0
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ocean_range_numval, ocean_range, ocean_range_rms
Flags:
2 : swh_ku == 0 || swh_rms_ku/swh_ku > 0.1
8 : ocean_range_numval < 12
128 : range_ku == nan || range_rms_ku == nan

ERS-2 | SGDR/REAPER | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: ocean_range_20hz
4 +2 -3 m stdalt RMS of Altimeter Range
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: ocean_range_rms
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh_20hz
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: ocean_sig0_20hz
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh_20hz, swh_rms, ocean_range_numval, ocean_range_20hz, ocean_range_rms
Flags:
2 : swh_ku == 0 || swh_rms_ku/swh_ku > 0.1
8 : ocean_range_numval < 12
128 : range_ku == nan || range_rms_ku == nan

Envisat (Extended Mission) | SGDR v2.1 | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
Source: SGDR v2.1
4 +2 -3 m stdalt RMS of Altimeter Range
5 2 -2 m swh Significant Wave Height
6 +2 -2 m stdswh RMS of Significant Wave Height
7 +2 -2 db sigma0 Backscatter Coefficient
8 +1 -1 m/s windsp Wind Speed
Wind Speed from RA2
Source: SGDR v2.1
Original-Parameter: ra2_wind_sp (Field number 112)
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR v2.1
Flags:
1 : agc_rms_ku > agc_ku
2 : swh_rms_ku > swh_ku
8 : range_numval_ku < 12
64 : rain_flag != 0 || ice_flag != 0
128 : range_rms_ku == nan

Envisat (Extended Mission) | SGDR v3.0 | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Source: SGDR v3.0
Original-Parameter: time_01
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Source: SGDR 3.0
Original-Parameter: time_01
3 +4 -3 m ralt Altimeter Range
Source: SGDR v3.0
Original-Parameter: range_ocean_01_ku
4 +2 -3 m stdalt RMS of Altimeter Range
Source: SGDR v3.0
Original-Parameter: range_ocean_rms_01_ku
5 2 -2 m swh Significant Wave Height
Source: SGDR v3.0
Original-Parameter: swh_ocean_01_ku
6 +2 -2 m stdswh RMS of Significant Wave Height
Source: SGDR v3.0
Original-Parameter: swh_ocean_rms_01_ku
7 +2 -2 db sigma0 Backscatter Coefficient
Source: SGDR v3.0
Original-Parameter: sig0_ocean_01_ku
8 +1 -1 m/s windsp Wind Speed
Source: SGDR v3.0
Original-Parameter: wind_speed_alt_01_ku
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR v3.0
Original-Parameter: range_ocean_01_ku, range_ocean_rms_01_ku, swh_ocean_01_ku, swh_ocean_rms_01_ku
Flags:
2 : swh_ocean_rms_01_ku == 0 or swh_ocean_rms_01_ku == 32767 or swh_ocean_01_ku == 0 or swh_ocean_01_ku == 32767 or stdswh/swh > 0.1
8 : range_numval_ku < 12
128 : range_ocean_01_ku == 2147483647 or range_ocean_rms_01_ku == 2147483647

Envisat | SGDR v2.1 | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
Ku-band ocean ranges
Source: SGDR v2.1
Original-Parameter: ku_band_ocean_range (Field number 17)
4 +2 -3 m stdalt RMS of Altimeter Range
5 2 -2 m swh Significant Wave Height
Source: SGDR v2.1
Original-Parameter: ku_sig_wv_ht (Field number 54)
6 +2 -2 m stdswh RMS of Significant Wave Height
Source: SGDRv2.1
7 +2 -2 db sigma0 Backscatter Coefficient
Ku-band corrected ocean backscatter coefficient
Source: SGDR v2.1
Original-Parameter: ku_ocean_bscat_coeff (Field number 72)
8 +1 -1 m/s windsp Wind Speed
Wind Speed from RA2
Source: SGDR v2.1
Original-Parameter: ra2_wind_sp (Field number 112)
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR v2.1
Flags:
1 : agc_rms_ku > agc_ku
2 : swh_rms_ku > swh_ku
8 : range_numval_ku < 12
64 : rain_flag != 0 || ice_flag != 0
128 : range_rms_ku == nan

Envisat | SGDR v2.1 | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
18 Hz Ku-band ocean ranges
Source: SGDR v2.1
Original-Parameter: hz18_ku_band_ocean (Field number 19)
4 +2 -3 m stdalt RMS of Altimeter Range
Source: SGDR v2.1
5 2 -2 m swh Significant Wave Height
Source: SGDR v2.1
Original-Parameter: ku_sig_wv_ht (Field number 54)
6 +2 -2 m stdswh RMS of Significant Wave Height
Standard deviation of 18hz ku-band significant wave height
Source: SGDR v2.1
Original-Parameter: sd_18hz_ku_swh (Field number 56)
7 +2 -2 db sigma0 Backscatter Coefficient
Ku-band corrected ocean backscatter coefficient
Source: SGDR v2.1
Original-Parameter: ku_ocean_bscat_coeff (Field number 72)
8 +1 -1 m/s windsp Wind Speed
Wind Speed from RA2
Source: SGDR v2.1
Original-Parameter: ra2_wind_sp (Field number 112)
9 +1 - - iflags Instrument Status and Quality Flags

Envisat | SGDR v3.0 | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Source: SGDR v3.0
Original-Parameter: time_01
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Source: SGDR 3.0
Original-Parameter: time_01
3 +4 -3 m ralt Altimeter Range
Source: SGDR v3.0
Original-Parameter: range_ocean_01_ku
4 +2 -3 m stdalt RMS of Altimeter Range
Source: SGDR v3.0
Original-Parameter: range_ocean_rms_01_ku
5 2 -2 m swh Significant Wave Height
Source: SGDR v3.0
Original-Parameter: swh_ocean_01_ku
6 +2 -2 m stdswh RMS of Significant Wave Height
Source: SGDR v3.0
Original-Parameter: swh_ocean_rms_01_ku
7 +2 -2 db sigma0 Backscatter Coefficient
Source: SGDR v3.0
Original-Parameter: sig0_ocean_01_ku
8 +1 -1 m/s windsp Wind Speed
Source: SGDR v3.0
Original-Parameter: wind_speed_alt_01_ku
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR v3.0
Original-Parameter: range_ocean_01_ku, range_ocean_rms_01_ku, swh_ocean_01_ku, swh_ocean_rms_01_ku
Flags:
2 : swh_ocean_rms_01_ku == 0 or swh_ocean_rms_01_ku == 32767 or swh_ocean_01_ku == 0 or swh_ocean_01_ku == 32767 or stdswh/swh > 0.1
8 : range_numval_ku < 12
128 : range_ocean_01_ku == 2147483647 or range_ocean_rms_01_ku == 2147483647

Geosat Follow-On | GDR | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
4 +2 -3 m stdalt RMS of Altimeter Range
5 2 -2 m swh Significant Wave Height
6 +2 -2 m stdswh RMS of Significant Wave Height
7 +2 -2 db sigma0 Backscatter Coefficient
8 +1 -1 m/s windsp Wind Speed
9 +1 - - iflags Instrument Status and Quality Flags

Jason-1 (Extended Mission) | SGDR-E | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
4 +2 -3 m stdalt RMS of Altimeter Range
5 2 -2 m swh Significant Wave Height
6 +2 -2 m stdswh RMS of Significant Wave Height
7 +2 -2 db sigma0 Backscatter Coefficient
8 +1 -1 m/s windsp Wind Speed
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR-E
Original-Parameter: agc_rms_ku, agc_ku, swh_rms_ku, swh_ku, range_numval_ku, rain_flag, ice_flag, range_ku, range_rms_ku
Flags:
1 : agc_rms_ku/agc_ku > 0.1
2 : swh_rms_ku/swh_ku > 0.1
8 : range_numval_ku < 12
64 : rain_flag != 0 || ice_flag != 0
128 : range_ku == nan || range_rms_ku == nan

Jason-1 (Geodetic Mission) | SGDR-E | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
4 +2 -3 m stdalt RMS of Altimeter Range
5 2 -2 m swh Significant Wave Height
6 +2 -2 m stdswh RMS of Significant Wave Height
7 +2 -2 db sigma0 Backscatter Coefficient
8 +1 -1 m/s windsp Wind Speed
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR-E
Original-Parameter: agc_rms_ku, agc_ku, swh_rms_ku, swh_ku, range_numval_ku, rain_flag, ice_flag, range_ku, range_rms_ku
Flags:
1 : agc_rms_ku/agc_ku > 0.1
2 : swh_rms_ku/swh_ku > 0.1
8 : range_numval_ku < 12
64 : rain_flag != 0 || ice_flag != 0
128 : range_ku == nan || range_rms_ku == nan

Jason-1 | SGDR-E | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
4 +2 -3 m stdalt RMS of Altimeter Range
5 2 -2 m swh Significant Wave Height
6 +2 -2 m stdswh RMS of Significant Wave Height
7 +2 -2 db sigma0 Backscatter Coefficient
8 +1 -1 m/s windsp Wind Speed
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR-E
Original-Parameter: agc_rms_ku, agc_ku, swh_rms_ku, swh_ku, range_numval_ku, rain_flag, ice_flag, range_ku, range_rms_ku
Flags:
1 : agc_rms_ku/agc_ku > 0.1
2 : swh_rms_ku/swh_ku > 0.1
8 : range_numval_ku < 12
64 : rain_flag != 0 || ice_flag != 0
128 : range_ku == nan || range_rms_ku == nan

Jason-2 (Extended Mission) | SGDR-D | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
4 +2 -3 m stdalt RMS of Altimeter Range
5 2 -2 m swh Significant Wave Height
6 +2 -2 m stdswh RMS of Significant Wave Height
7 +2 -2 db sigma0 Backscatter Coefficient
8 +1 -1 m/s windsp Wind Speed
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR-D
Original-Parameter: agc_rms_ku, agc_ku, swh_rms_ku, swh_ku, range_numval_ku, rain_flag, ice_flag, range_ku, range_rms_ku
Flags:
1 : agc_rms_ku/agc_ku > 0.1
2 : swh_rms_ku/swh_ku > 0.1
8 : range_numval_ku < 12
64 : rain_flag != 0 || ice_flag != 0
128 : range_ku == nan || range_rms_ku == nan

Jason-2 (Extended Mission) | SGDR-D | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
4 +2 -3 m stdalt RMS of Altimeter Range
5 2 -2 m swh Significant Wave Height
6 +2 -2 m stdswh RMS of Significant Wave Height
7 +2 -2 db sigma0 Backscatter Coefficient
8 +1 -1 m/s windsp Wind Speed
9 +1 - - iflags Instrument Status and Quality Flags

Jason-2 (Geodetic Mission, Phase 1) | SGDR-D | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
4 +2 -3 m stdalt RMS of Altimeter Range
5 2 -2 m swh Significant Wave Height
6 +2 -2 m stdswh RMS of Significant Wave Height
7 +2 -2 db sigma0 Backscatter Coefficient
8 +1 -1 m/s windsp Wind Speed
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR-D
Original-Parameter: agc_rms_ku, agc_ku, swh_rms_ku, swh_ku, range_numval_ku, rain_flag, ice_flag, range_ku, range_rms_ku
Flags:
1 : agc_rms_ku/agc_ku > 0.1
2 : swh_rms_ku/swh_ku > 0.1
8 : range_numval_ku < 12
64 : rain_flag != 0 || ice_flag != 0
128 : range_ku == nan || range_rms_ku == nan

Jason-2 (Geodetic Mission, Phase 2) | SGDR-D | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
4 +2 -3 m stdalt RMS of Altimeter Range
5 2 -2 m swh Significant Wave Height
6 +2 -2 m stdswh RMS of Significant Wave Height
7 +2 -2 db sigma0 Backscatter Coefficient
8 +1 -1 m/s windsp Wind Speed
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR-D
Original-Parameter: agc_rms_ku, agc_ku, swh_rms_ku, swh_ku, range_numval_ku, rain_flag, ice_flag, range_ku, range_rms_ku
Flags:
1 : agc_rms_ku/agc_ku > 0.1
2 : swh_rms_ku/swh_ku > 0.1
8 : range_numval_ku < 12
64 : rain_flag != 0 || ice_flag != 0
128 : range_ku == nan || range_rms_ku == nan

Jason-2 | SGDR-D | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
1 Hz Ku band corrected altimeter range
Source: SGDR-D
Original-Parameter: range_ku
4 +2 -3 m stdalt RMS of Altimeter Range
Source: SGDR-D
Original-Parameter: range_rms_ku
5 2 -2 m swh Significant Wave Height
Significant Wave Height from Ku-Band
Source: SGDR-D
Original-Parameter: swh_ku
6 +2 -2 m stdswh RMS of Significant Wave Height
RMS of the Ku band significant waveheight
Source: SGDR-D
Original-Parameter: swh_rms_ku
7 +2 -2 db sigma0 Backscatter Coefficient
Ku band corrected backscatter coefficient
Source: SGDR-D
Original-Parameter: sig0_ku
8 +1 -1 m/s windsp Wind Speed
Wind Speed from RA2
Source: SGDR-D
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR-D
Original-Parameter: agc_rms_ku, agc_ku, swh_rms_ku, swh_ku, range_numval_ku, rain_flag, ice_flag, range_ku, range_rms_ku
Flags:
1 : agc_rms_ku/agc_ku > 0.1
2 : swh_rms_ku/swh_ku > 0.1
8 : range_numval_ku < 12
64 : rain_flag != 0 || ice_flag != 0
128 : range_ku == nan || range_rms_ku == nan

Jason-2 | SGDR-D | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
20 Hz Ku band corrected altimeter range
Source: SGDR-D
Original-Parameter: range_20hz_ku
4 +2 -3 m stdalt RMS of Altimeter Range
Source: SGDR-D
Original-Parameter: range_rms_ku
5 2 -2 m swh Significant Wave Height
Significant Wave Height from Ku-Band
Source: SGDR-D
Original-Parameter: swh_20hz_ku
6 +2 -2 m stdswh RMS of Significant Wave Height
RMS of the Ku band significant waveheight
Source: SGDR-D
Original-Parameter: swh_rms_ku
7 +2 -2 db sigma0 Backscatter Coefficient
20 Hz Ku band corrected backscatter coefficient
Source: SGDR-D
Original-Parameter: sig0_20hz_ku
8 +1 -1 m/s windsp Wind Speed
Wind Speed from RA2
Source: SGDR-D
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags

Jason-3 (Extended Mission) | SGDR-F | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time of measurement in seconds in the UTC time scale since 1 Jan 2000 00:00:00 UTC. [tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. If a leap second occurs within the data set, the attribute [leap_second] is set to the UTC time at which the leap second occurs
Source: SGDR-F
Original-Parameter: data_01/time
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time of measurement in seconds in the UTC time scale since 1 Jan 2000 00:00:00 UTC. [tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. If a leap second occurs within the data set, the attribute [leap_second] is set to the UTC time at which the leap second occurs
Source: SGDR-F
Original-Parameter: data_01/time
3 +4 -3 m ralt Altimeter Range
Named range_ku in GDR-D standard. All instrumental corrections included, i.e. distance antenna-COG (/data_01/range_cor_cog), USO drift correction (/data_01/range_cor_uso), internal path correction (range_cor_internal_path), Doppler correction (range_cor_doppler), modeled instrumental errors correction (range_cor_ocean_model_instr) and system bias
Source: SGDR-F
Original-Parameter: data_01/ku/range_ocean
4 +2 -3 m stdalt RMS of Altimeter Range
Named range_rms_ku in GDR-D standard. Compression of Ku band high rate elements is preceded by a detection of outliers. Only valid high-rate values are used to compute this element
Source: SGDR-F
Original-Parameter: data_01/ku/range_ocean_rms
5 2 -2 m swh Significant Wave Height
Named swh_ku in GDR-D standard. All instrumental corrections included, i.e. modeled instrumental errors correction (swh_cor_ocean_model_instr) and system bias
Source: SGDR-F
Original-Parameter: data_01/ku/swh_ocean
6 +2 -2 m stdswh RMS of Significant Wave Height
Named swh_rms_ku in GDR-D standard. Compression of Ku band high rate elements is preceded by a detection of outliers. Only valid high-rate values are used to compute this element
Source: SGDR-F
Original-Parameter: data_01/ku/swh_ocean_rms
7 +2 -2 db sigma0 Backscatter Coefficient
Named sig0_ku in GDR-D standard. All instrumental corrections included, excepted the system bias, i.e. AGC instrumental errors correction, internal calibration correction (sig0_cor_calibration), modeled instrumental errors correction (sig0_cor_ocean_model_instr) and atmospheric attenuation (sig0_cor_atm)
Source: SGDR-F
Original-Parameter: data_01/ku/sig0_ocean
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See Jason-3 User Handbook. A calibration bias of +0.06 dB has been added to the Ku band backscatter coefficient (/data_01/ku/sig0_ocean) before computing the wind speed
Source: SGDR-F
Original-Parameter: data_01/wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR-F
Original-Parameter: data_01/ku/agc, data_01/ku/agc_rms, data_01/ku/range_ocean_numval, data_01/rain_flag, data_01/ice_flag
Flags:
1 : agc_rms in [0,32767] or agc in [0,32767] or agc_rms/agc > 0.1
2 : swh_ocean_rms in [0,32767] or swh_ocean in [0,32767] or swh_ocean_rms/swh_ocean > 0.1
8 : range_ocean_numval < 12
64 : rain_flag != 0 or ice_flag != 0
128 : range_ocean = 2147483647 or range_ocean_rms == 2147483647

Jason-3 (Extended Mission) | SGDR-F | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Named time_20hz in GDR-D standard. Time of measurement in seconds in the UTC time scale since 1 Jan 2000 00:00:00 UTC. [tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. If a leap second occurs within the data set, the attribute [leap_second] is set to the UTC time at which the leap second occurs
Source: SGDR-F
Original-Parameter: data_20/time
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Named time_20hz in GDR-D standard. Time of measurement in seconds in the UTC time scale since 1 Jan 2000 00:00:00 UTC. [tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. If a leap second occurs within the data set, the attribute [leap_second] is set to the UTC time at which the leap second occurs
Source: SGDR-F
Original-Parameter: data_20/time
3 +4 -3 m ralt Altimeter Range
Named range_20hz_ku in GDR-D standard. All instrumental corrections included, i.e. distance antenna-COG (/data_01/range_cor_cog), USO drift correction (/data_01/range_cor_uso), internal path correction (/data_01/ku/range_cor_internal_path), Doppler correction (/data_01/ku/range_cor_doppler), modeled instrumental errors correction (/data_01/ku/range_cor_ocean_model_instr) and system bias
Source: SGDR-F
Original-Parameter: data_20/ku/range_ocean
4 +2 -3 m stdalt RMS of Altimeter Range
n.a.
5 2 -2 m swh Significant Wave Height
Named swh_20hz_ku in GDR-D standard. All instrumental corrections included, i.e. modeled instrumental errors correction (/data_01/ku/swh_cor_ocean_model_instr) and system bias
Source: SGDR-F
Original-Parameter: data_20/ku/swh_ocean
6 +2 -2 m stdswh RMS of Significant Wave Height
n.a.
7 +2 -2 db sigma0 Backscatter Coefficient
Named sig0_20hz_ku in GDR-D standard. All instrumental corrections included, excepted the system bias, i.e. AGC instrumental errors correction, internal calibration correction (/data_01/ku/sig0_cor_calibration), modeled instrumental errors correction (/data_01/ku/sig0_cor_ocean_model_instr) and atmospheric attenuation (sig0_cor_atm)
Source: SGDR-F
Original-Parameter: data_20/ku/sig0_ocean
8 +1 -1 m/s windsp Wind Speed
n.a.
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR-F
Original-Parameter: data_20/ku/agc
Flags:
1 : agc in [0,32767]
2 : swh_ocean in [0,32767]
128 : range_ocean == 2147483647

Jason-3 | SGDR-D | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
1 Hz Ku band corrected altimeter range
Source: SGDR-D
Original-Parameter: range_ku
4 +2 -3 m stdalt RMS of Altimeter Range
Source: SGDR-D
Original-Parameter: range_rms_ku
5 2 -2 m swh Significant Wave Height
Significant Wave Height from Ku-Band
Source: SGDR-D
Original-Parameter: swh_ku
6 +2 -2 m stdswh RMS of Significant Wave Height
RMS of the Ku band significant waveheight
Source: SGDR-D
Original-Parameter: swh_rms_ku
7 +2 -2 db sigma0 Backscatter Coefficient
Ku band corrected backscatter coefficient
Source: SGDR-D
Original-Parameter: sig0_ku
8 +1 -1 m/s windsp Wind Speed
Wind Speed from RA2
Source: SGDR-D
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR-D
Original-Parameter: agc_rms_ku, agc_ku, swh_rms_ku, swh_ku, range_numval_ku, rain_flag, ice_flag, range_ku, range_rms_ku
Flags:
1 : agc_rms_ku/agc_ku > 0.1
2 : swh_rms_ku/swh_ku > 0.1
8 : range_numval_ku < 12
64 : rain_flag != 0 || ice_flag != 0
128 : range_ku == nan || range_rms_ku == nan

Jason-3 | SGDR-D | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
20 Hz Ku band corrected altimeter range
Source: SGDR-D
Original-Parameter: range_20hz_ku
4 +2 -3 m stdalt RMS of Altimeter Range
Source: SGDR-D
Original-Parameter: range_rms_ku
5 2 -2 m swh Significant Wave Height
Significant Wave Height from Ku-Band
Source: SGDR-D
Original-Parameter: swh_20hz_ku
6 +2 -2 m stdswh RMS of Significant Wave Height
RMS of the Ku band significant waveheight
Source: SGDR-D
Original-Parameter: swh_rms_ku
7 +2 -2 db sigma0 Backscatter Coefficient
20 Hz Ku band corrected backscatter coefficient
Source: SGDR-D
Original-Parameter: sig0_20hz_ku
8 +1 -1 m/s windsp Wind Speed
9 +1 - - iflags Instrument Status and Quality Flags

Jason-3 | SGDR-F | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Source: SGDR-F
Original-Parameter: data_01/time
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Source: SGDR-F
Original-Parameter: data_01/time
3 +4 -3 m ralt Altimeter Range
Source: SGDR-F
Original-Parameter: data_01/ku/range_ocean
4 +2 -3 m stdalt RMS of Altimeter Range
Source: SGDR-F
Original-Parameter: data_01/ku/range_ocean_rms
5 2 -2 m swh Significant Wave Height
Source: SGDR-F
Original-Parameter: data_01/ku/swh_ocean
6 +2 -2 m stdswh RMS of Significant Wave Height
Source: SGDR-F
Original-Parameter: data_01/ku/swh_ocean_rms
7 +2 -2 db sigma0 Backscatter Coefficient
Source: SGDR-F
Original-Parameter: data_01/ku/sig0_ocean
8 +1 -1 m/s windsp Wind Speed
Source: SGDR-F
Original-Parameter: data_01/wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR-F
Original-Parameter: data_01/ku/agc_rms, data_01/ku/agc, data_01/ku/swh_ocean_rm, data_01/ku/swh_ocean, data_01/ku/range_ocean_numval, data_01/rain_flag, data_01/ice_flag, data_01/ku/range_ocean, data_01/ku/range_ocean_rms
Flags:
1 : agc_rms/agc > 0.1
2 : swh_ocean_rms/swh_ocean > 0.1
8 : range_ocean_numval < 12
64 : rain_flag != 0 || ice_flag != 0
128 : range_ocean == nan || range_ocean_rms == nan

Jason-3 | SGDR-F | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Named time_20hz in GDR-D standard. Time of measurement in seconds in the UTC time scale since 1 Jan 2000 00:00:00 UTC. [tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. If a leap second occurs within the data set, the attribute [leap_second] is set to the UTC time at which the leap second occurs
Source: SGDR-F
Original-Parameter: data_20/time
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Named time_20hz in GDR-D standard. Time of measurement in seconds in the UTC time scale since 1 Jan 2000 00:00:00 UTC. [tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. If a leap second occurs within the data set, the attribute [leap_second] is set to the UTC time at which the leap second occurs
Source: SGDR-F
Original-Parameter: data_20/time
3 +4 -3 m ralt Altimeter Range
Named range_20hz_ku in GDR-D standard. All instrumental corrections included, i.e. distance antenna-COG (/data_01/range_cor_cog), USO drift correction (/data_01/range_cor_uso), internal path correction (/data_01/ku/range_cor_internal_path), Doppler correction (/data_01/ku/range_cor_doppler), modeled instrumental errors correction (/data_01/ku/range_cor_ocean_model_instr) and system bias
Source: SGDR-F
Original-Parameter: data_20/ku/range_ocean
4 +2 -3 m stdalt RMS of Altimeter Range
n.a.
5 2 -2 m swh Significant Wave Height
Named swh_20hz_ku in GDR-D standard. All instrumental corrections included, i.e. modeled instrumental errors correction (/data_01/ku/swh_cor_ocean_model_instr) and system bias
Source: SGDR-F
Original-Parameter: data_20/ku/swh_ocean
6 +2 -2 m stdswh RMS of Significant Wave Height
n.a.
7 +2 -2 db sigma0 Backscatter Coefficient
Named sig0_20hz_ku in GDR-D standard. All instrumental corrections included, excepted the system bias, i.e. AGC instrumental errors correction, internal calibration correction (/data_01/ku/sig0_cor_calibration), modeled instrumental errors correction (/data_01/ku/sig0_cor_ocean_model_instr) and atmospheric attenuation (sig0_cor_atm)
Source: SGDR-F
Original-Parameter: data_20/ku/sig0_ocean
8 +1 -1 m/s windsp Wind Speed
n.a.
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR-F
Original-Parameter: data_20/ku/agc
Flags:
1 : agc in [0,32767]
2 : swh_ocean in [0,32767]
128 : range_ocean == 2147483647

Poseidon | GDR | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
4 +2 -3 m stdalt RMS of Altimeter Range
5 2 -2 m swh Significant Wave Height
6 +2 -2 m stdswh RMS of Significant Wave Height
7 +2 -2 db sigma0 Backscatter Coefficient
8 +1 -1 m/s windsp Wind Speed
9 +1 - - iflags Instrument Status and Quality Flags

SARAL (Drifting Phase) | SGDR-F | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec None
2 +4 -6 sec msec None
3 +4 -3 m ralt None
4 +2 -3 m stdalt None
5 2 -2 m swh None
6 +2 -2 m stdswh None
7 +2 -2 db sigma0 None
8 +1 -1 m/s windsp None
9 +1 - - iflags Instrument Status and Quality Flags

SARAL (Drifting Phase) | SGDR-T | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
4 +2 -3 m stdalt RMS of Altimeter Range
5 2 -2 m swh Significant Wave Height
6 +2 -2 m stdswh RMS of Significant Wave Height
7 +2 -2 db sigma0 Backscatter Coefficient
8 +1 -1 m/s windsp Wind Speed
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR-T
Original-Parameter: agc_rms_ku, agc_ku, swh_rms_ku, swh_ku, range_numval_ku, ice_flag, range_ku, range_rms_ku
Flags:
1 : agc_rms_ku/agc_ku > 0.1
2 : swh_rms_ku/swh_ku > 0.1
8 : range_numval_ku < 12
64 : ice_flag != 0
128 : range_ku == nan || range_rms_ku == nan

SARAL | SGDR-F | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec None
2 +4 -6 sec msec None
3 +4 -3 m ralt None
4 +2 -3 m stdalt None
5 2 -2 m swh None
6 +2 -2 m stdswh None
7 +2 -2 db sigma0 None
8 +1 -1 m/s windsp None
9 +1 - - iflags Instrument Status and Quality Flags

SARAL | SGDR-T | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
4 +2 -3 m stdalt RMS of Altimeter Range
5 2 -2 m swh Significant Wave Height
6 +2 -2 m stdswh RMS of Significant Wave Height
7 +2 -2 db sigma0 Backscatter Coefficient
8 +1 -1 m/s windsp Wind Speed
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR-T
Original-Parameter: agc_rms_ku, agc_ku, swh_rms_ku, swh_ku, range_numval_ku, ice_flag, range_ku, range_rms_ku
Flags:
1 : agc_rms_ku/agc_ku > 0.1
2 : swh_rms_ku/swh_ku > 0.1
8 : range_numval_ku < 12
64 : ice_flag != 0
128 : range_ku == nan || range_rms_ku == nan

Sentinel-3A (SAR) | SGDR/NTC | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
4 +2 -3 m stdalt RMS of Altimeter Range
5 2 -2 m swh Significant Wave Height
6 +2 -2 m stdswh RMS of Significant Wave Height
7 +2 -2 db sigma0 Backscatter Coefficient
8 +1 -1 m/s windsp Wind Speed
9 +1 - - iflags Instrument Status and Quality Flags

Sentinel-3B (SAR) | SGDR/NTC | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
4 +2 -3 m stdalt RMS of Altimeter Range
5 2 -2 m swh Significant Wave Height
6 +2 -2 m stdswh RMS of Significant Wave Height
7 +2 -2 db sigma0 Backscatter Coefficient
8 +1 -1 m/s windsp Wind Speed
9 +1 - - iflags Instrument Status and Quality Flags

Sentinel-6A (HR) | NTC/F08 | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
It contains the seconds since 1 Jan 2000 00:00:00. Time is in UTC. Time refers to the instant the L1B waveform (which is a combination of echoes for both LR and HR) touches the surface. Whenever a leap second occurs, the attribute leap_second will be set to the appropriate value
Source: NTC/F08
Original-Parameter: data_01/time
2 +4 -6 sec msec Microseconds, Fractional Part of isec
It contains the seconds since 1 Jan 2000 00:00:00. Time is in UTC. Time refers to the instant the L1B waveform (which is a combination of echoes for both LR and HR) touches the surface. Whenever a leap second occurs, the attribute leap_second will be set to the appropriate value
Source: NTC/F08
Original-Parameter: data_01/time
3 +4 -3 m ralt Altimeter Range
Range computed from the ocean retracker. It includes all instrumental corrections from net_instr_cor_range_ocean
Source: NTC/F08
Original-Parameter: data_01/ku/range_ocean
4 +2 -3 m stdalt RMS of Altimeter Range
Standard deviation of 20 Hz measurements. Compression of the 20 Hz measurements is preceded by a detection of outliers. Only valid 20 Hz values are used to compute this 1 Hz measurement.
Source: NTC/F08
Original-Parameter: data_01/ku/range_ocean_rms
5 2 -2 m swh Significant Wave Height
SWH computed from the ocean retracker. It includes all instrumental corrections from net_instr_cor_swh_ocean
Source: NTC/F08
Original-Parameter: data_01/ku/swh_ocean
6 +2 -2 m stdswh RMS of Significant Wave Height
Standard deviation of 20 Hz measurements. Compression of the 20 Hz measurements is preceded by a detection of outliers. Only valid 20 Hz values are used to compute this 1 Hz measurement.
Source: NTC/F08
Original-Parameter: data_01/ku/swh_ocean_rms
7 +2 -2 db sigma0 Backscatter Coefficient
Standard deviation of 20 Hz measurements. Compression of the 20 Hz measurements is preceded by a detection of outliers. Only valid 20 Hz values are used to compute this 1 Hz measurement.
Source: NTC/F08
Original-Parameter: data_01/ku/swh_ocean_rms
8 +1 -1 m/s windsp Wind Speed
Wind speed at 10 m height derived from altimeter measurements. A calibration bias of -4.37 dB has been added to the Ku-band backscatter coefficient (sig0_ocean) before computing the wind speed. Should not be used over land.
Source: NTC/F08
Original-Parameter: data_01/wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: NTC/F08
Original-Parameter: data_01/range_ocean_numval, data_01/rain_flag, data_01/rad_sea_ice_flag
Flags:
2: swh_ocean_rms in [0,32767] or swh_ocean in [0,32767] or swh_ocean_rms/swh_ocean > 0.1
8: range_ocean_numval < 12
64 : rain_flag != 0 or rad_sea_ice_flag != 0
128 : range_ocean = nan || ralt == range_ocean_rms

Sentinel-6A (HR) | NTC/F08 | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
It contains the seconds since 1 Jan 2000 00:00:00. Time is in UTC. Time refers to the instant the L1B waveform (which is a combination of echoes for both LR and HR) touches the surface. Whenever a leap second occurs, the attribute leap_second will be set to the appropriate value
Source: NTC/F08
Original-Parameter: data_20/ku/time
2 +4 -6 sec msec Microseconds, Fractional Part of isec
It contains the seconds since 1 Jan 2000 00:00:00. Time is in UTC. Time refers to the instant the L1B waveform (which is a combination of echoes for both LR and HR) touches the surface. Whenever a leap second occurs, the attribute leap_second will be set to the appropriate value
Source: NTC/F08
Original-Parameter: data_20/ku/time
3 +4 -3 m ralt Altimeter Range
Range computed from the ocean retracker. It includes all instrumental corrections from net_instr_cor_range_ocean
Source: NTC/F08
Original-Parameter: data_20/ku/range_ocean
4 +2 -3 m stdalt RMS of Altimeter Range
n.a.
5 2 -2 m swh Significant Wave Height
SWH computed from the ocean retracker. It includes all instrumental corrections from net_instr_cor_swh_ocean
Source: NTC/F08
Original-Parameter: data_20/ku/swh_ocean
6 +2 -2 m stdswh RMS of Significant Wave Height
n.a.
7 +2 -2 db sigma0 Backscatter Coefficient
Backscatter coefficient computed from the ocean retracker. It includes all instrumental corrections from net_instr_cor_sig0_ocean and sig0_scaling_factor as well as the atmospheric attenuation correction.
Source: NTC/F08
Original-Parameter: data_20/ku/sig0_ocean
8 +1 -1 m/s windsp Wind Speed
n.a.
9 +1 - - iflags Instrument Status and Quality Flags
Source: NTC/F08
Original-Parameter: data_20/ku/swh_ocean, data_20/ku/range_ocean
Flags:
2: swh_ocean in [0,32767]
128 : range_ocean = nan

Sentinel-6A (LR) | NTC/F08 | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
It contains the seconds since 1 Jan 2000 00:00:00. Time is in UTC. Time refers to the instant the L1B waveform (which is a combination of echoes for both LR and HR) touches the surface. Whenever a leap second occurs, the attribute leap_second will be set to the appropriate value
Source: NTC/F08
Original-Parameter: data_01/time
2 +4 -6 sec msec Microseconds, Fractional Part of isec
It contains the seconds since 1 Jan 2000 00:00:00. Time is in UTC. Time refers to the instant the L1B waveform (which is a combination of echoes for both LR and HR) touches the surface. Whenever a leap second occurs, the attribute leap_second will be set to the appropriate value
Source: NTC/F08
Original-Parameter: data_01/time
3 +4 -3 m ralt Altimeter Range
Range computed from the ocean retracker. It includes all instrumental corrections from net_instr_cor_range_ocean
Source: NTC/F08
Original-Parameter: data_01/ku/range_ocean
4 +2 -3 m stdalt RMS of Altimeter Range
Standard deviation of 20 Hz measurements. Compression of the 20 Hz measurements is preceded by a detection of outliers. Only valid 20 Hz values are used to compute this 1 Hz measurement.
Source: NTC/F08
Original-Parameter: data_01/ku/range_ocean_rms
5 2 -2 m swh Significant Wave Height
SWH computed from the ocean retracker. It includes all instrumental corrections from net_instr_cor_swh_ocean
Source: NTC/F08
Original-Parameter: data_01/ku/swh_ocean
6 +2 -2 m stdswh RMS of Significant Wave Height
Standard deviation of 20 Hz measurements. Compression of the 20 Hz measurements is preceded by a detection of outliers. Only valid 20 Hz values are used to compute this 1 Hz measurement.
Source: NTC/F08
Original-Parameter: data_01/ku/swh_ocean_rms
7 +2 -2 db sigma0 Backscatter Coefficient
Standard deviation of 20 Hz measurements. Compression of the 20 Hz measurements is preceded by a detection of outliers. Only valid 20 Hz values are used to compute this 1 Hz measurement.
Source: NTC/F08
Original-Parameter: data_01/ku/swh_ocean_rms
8 +1 -1 m/s windsp Wind Speed
Wind speed at 10 m height derived from altimeter measurements. A calibration bias of +1.35 dB has been added to the Ku-band backscatter coefficient (sig0_ocean) before computing the wind speed. Should not be used over land.
Source: NTC/F08
Original-Parameter: data_01/wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: NTC/F08
Original-Parameter: data_01/range_ocean_numval, data_01/rain_flag, data_01/rad_sea_ice_flag
Flags:
2: swh_ocean_rms in [0,32767] or swh_ocean in [0,32767] or swh_ocean_rms/swh_ocean > 0.1
8: range_ocean_numval < 12
64 : rain_flag != 0 or rad_sea_ice_flag != 0
128 : range_ocean = nan || ralt == range_ocean_rms

Sentinel-6A (LR) | NTC/F08 | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
It contains the seconds since 1 Jan 2000 00:00:00. Time is in UTC. Time refers to the instant the L1B waveform (which is a combination of echoes for both LR and HR) touches the surface. Whenever a leap second occurs, the attribute leap_second will be set to the appropriate value
Source: NTC/F08
Original-Parameter: data_20/ku/time
2 +4 -6 sec msec Microseconds, Fractional Part of isec
It contains the seconds since 1 Jan 2000 00:00:00. Time is in UTC. Time refers to the instant the L1B waveform (which is a combination of echoes for both LR and HR) touches the surface. Whenever a leap second occurs, the attribute leap_second will be set to the appropriate value
Source: NTC/F08
Original-Parameter: data_20/ku/time
3 +4 -3 m ralt Altimeter Range
Range computed from the ocean retracker. It includes all instrumental corrections from net_instr_cor_range_ocean
Source: NTC/F08
Original-Parameter: data_20/ku/range_ocean
4 +2 -3 m stdalt RMS of Altimeter Range
n.a.
5 2 -2 m swh Significant Wave Height
SWH computed from the ocean retracker. It includes all instrumental corrections from net_instr_cor_swh_ocean
Source: NTC/F08
Original-Parameter: data_20/ku/swh_ocean
6 +2 -2 m stdswh RMS of Significant Wave Height
n.a.
7 +2 -2 db sigma0 Backscatter Coefficient
Backscatter coefficient computed from the ocean retracker. It includes all instrumental corrections from net_instr_cor_sig0_ocean and sig0_scaling_factor as well as the atmospheric attenuation correction.
Source: NTC/F08
Original-Parameter: data_20/ku/sig0_ocean
8 +1 -1 m/s windsp Wind Speed
n.a.
9 +1 - - iflags Instrument Status and Quality Flags
Source: NTC/F08
Original-Parameter: data_20/ku/swh_ocean, data_20/ku/range_ocean
Flags:
2: swh_ocean in [0,32767]
128 : range_ocean = nan

Topex (Extended Mission) | GDR | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
4 +2 -3 m stdalt RMS of Altimeter Range
5 2 -2 m swh Significant Wave Height
6 +2 -2 m stdswh RMS of Significant Wave Height
7 +2 -2 db sigma0 Backscatter Coefficient
8 +1 -1 m/s windsp Wind Speed
9 +1 - - iflags Instrument Status and Quality Flags

Topex (Extended Mission) | GDR-F | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
[tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. [leap_second] is the UTC time at which a leap second occurs in the data set, if any. After this UTC time, the tai_utc_difference is increased by 1 second.
Source: GDR-F
Original-Parameter: time
2 +4 -6 sec msec Microseconds, Fractional Part of isec
[tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. [leap_second] is the UTC time at which a leap second occurs in the data set, if any. After this UTC time, the tai_utc_difference is increased by 1 second.
Source: GDR-F
Original-Parameter: time
3 +4 -3 m ralt Altimeter Range
1 Hz Ku-band MLE4 range. Net instrument correction (net_instr_cor_range_ku) has been added.
Source: GDR-F
Original-Parameter: range_ku
4 +2 -3 m stdalt RMS of Altimeter Range
RMS of 20 Hz Ku-band MLE4 range measurements. Only valid 20 Hz measurements are used to compute this element.
Source: GDR-F
Original-Parameter: range_rms_ku
5 2 -2 m swh Significant Wave Height
1 Hz Ku-band MLE4 significant waveheight. Instrumental corrections are not required.
Source: GDR-F
Original-Parameter: swh_ku
6 +2 -2 m stdswh RMS of Significant Wave Height
RMS of 20 Hz Ku-band MLE4 significant waveheight measurements. Only valid 20 Hz measurements are used to compute this element.
Source: GDR-F
Original-Parameter: swh_rms_ku
7 +2 -2 db sigma0 Backscatter Coefficient
Sum of Ku-band AGC, MLE-4 retracked Ku-band echoes amplitude correction (including Ku-band point target response correction, given in net_instr_cor_sig0_ku), amplitude correction to account for satellite altitude, atmospheric attenuation (rad_atm_cor_sig0_ku), and constant Ku-band bias to align with original geophysical data record from side B.
Source: GDR-F
Original-Parameter: sig0_ku
8 +1 -1 m/s windsp Wind Speed
Sea surface wind speed.
Source: GDR-F
Original-Parameter: rad_wind_speed
9 +1 - - iflags Instrument Status and Quality Flags
Source: GDR-F
Original-Parameter: agc_ku, agc_rms_ku, alt_state_flag_oper, range_numval_ku, rain_flag,ice_flag
Flags:
1 : agc_ku in [32767,0] or agc_rms_ku in [32767,0] or agc_rms_ku/agc_ku > 0.1
2 : swh_ku in [32767,0] or swh_rms_ku in [32767,0] or swh_rms_ku/swh_ku > 0.1
4 : alt_state_flag_oper == 1 (0: SideA, 1: SideB)
8 : range_numval_ku < 12
16 : alt_state_flag_oper == 2 (0: Topex, 1: Poseidon)
64 : rain_flag != 0 or ice_flag != 0
128 : range_ku == nan or range_rms_ku == nan

Topex (Extended Mission) | GDR-F | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
[tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. [leap_second] is the UTC time at which a leap second occurs in the data set, if any. After this UTC time, the tai_utc_difference is increased by 1 second.
Source: GDR-F
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
[tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. [leap_second] is the UTC time at which a leap second occurs in the data set, if any. After this UTC time, the tai_utc_difference is increased by 1 second.
Source: GDR-F
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
20 Hz Ku-band MLE4 range. Net instrument range correction (net_instr_cor_range_ku) has been added.
Source: GDR-F
Original-Parameter: range_20hz_ku
4 +2 -3 m stdalt RMS of Altimeter Range
RMS of 20 Hz Ku-band MLE4 range measurements. Only valid 20 Hz measurements are used to compute this element.
Source: GDR-F
Original-Parameter: range_rms_ku
5 2 -2 m swh Significant Wave Height
20 Hz Ku-band MLE4 significant waveheight. Instrumental corrections are not required.
Source: GDR-F
Original-Parameter: swh_20hz_ku
6 +2 -2 m stdswh RMS of Significant Wave Height
RMS of 20 Hz Ku-band MLE4 significant waveheight measurements. Only valid 20 Hz measurements are used to compute this element.
Source: GDR-F
Original-Parameter: swh_rms_ku
7 +2 -2 db sigma0 Backscatter Coefficient
Sum of Ku-band AGC, MLE-4 retracked Ku-band echoes amplitude correction (including Ku-band point target response correction, given in net_instr_cor_sig0_ku), amplitude correction to account for satellite altitude, atmospheric attenuation (rad_atm_cor_sig0_ku), and constant Ku-band bias to align with original geophysical data record from side B.
Source: GDR-F
Original-Parameter: sig0_20hz_ku
8 +1 -1 m/s windsp Wind Speed
Sea surface wind speed.
Source: GDR-F
Original-Parameter: rad_wind_speed
9 +1 - - iflags Instrument Status and Quality Flags
Source: GDR-F
Original-Parameter: agc_20hz_ku, agc_rms_ku, alt_state_flag_oper, range_numval_ku, rain_flag,ice_flag
Flags:
1 : agc_20hz_ku in [32767,0] or agc_rms_ku in [32767,0] or agc_rms_ku/agc_20hz_ku > 0.1
2 : swh_ku in [32767,0] or swh_rms_ku in [32767,0] or swh_rms_ku/swh_ku > 0.1
4 : alt_state_flag_oper == 1 (0: SideA, 1: SideB)
8 : range_numval_ku < 12
16 : alt_state_flag_oper == 2 (0: Topex, 1: Poseidon)
64 : rain_flag != 0 or ice_flag != 0
128 : range_ku == nan or range_rms_ku == nan

Topex | GDR | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
4 +2 -3 m stdalt RMS of Altimeter Range
5 2 -2 m swh Significant Wave Height
6 +2 -2 m stdswh RMS of Significant Wave Height
7 +2 -2 db sigma0 Backscatter Coefficient
8 +1 -1 m/s windsp Wind Speed
9 +1 - - iflags Instrument Status and Quality Flags

Topex | GDR-F | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
[tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. [leap_second] is the UTC time at which a leap second occurs in the data set, if any. After this UTC time, the tai_utc_difference is increased by 1 second.
Source: GDR-F
Original-Parameter: time
2 +4 -6 sec msec Microseconds, Fractional Part of isec
[tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. [leap_second] is the UTC time at which a leap second occurs in the data set, if any. After this UTC time, the tai_utc_difference is increased by 1 second.
Source: GDR-F
Original-Parameter: time
3 +4 -3 m ralt Altimeter Range
1 Hz Ku-band MLE4 range. Net instrument correction (net_instr_cor_range_ku) has been added.
Source: GDR-F
Original-Parameter: range_ku
4 +2 -3 m stdalt RMS of Altimeter Range
RMS of 20 Hz Ku-band MLE4 range measurements. Only valid 20 Hz measurements are used to compute this element.
Source: GDR-F
Original-Parameter: range_rms_ku
5 2 -2 m swh Significant Wave Height
1 Hz Ku-band MLE4 significant waveheight. Instrumental corrections are not required.
Source: GDR-F
Original-Parameter: swh_ku
6 +2 -2 m stdswh RMS of Significant Wave Height
RMS of 20 Hz Ku-band MLE4 significant waveheight measurements. Only valid 20 Hz measurements are used to compute this element.
Source: GDR-F
Original-Parameter: swh_rms_ku
7 +2 -2 db sigma0 Backscatter Coefficient
Sum of Ku-band AGC, MLE-4 retracked Ku-band echoes amplitude correction (including Ku-band point target response correction, given in net_instr_cor_sig0_ku), amplitude correction to account for satellite altitude, atmospheric attenuation (rad_atm_cor_sig0_ku), and constant Ku-band bias to align with original geophysical data record from side B.
Source: GDR-F
Original-Parameter: sig0_ku
8 +1 -1 m/s windsp Wind Speed
Sea surface wind speed.
Source: GDR-F
Original-Parameter: rad_wind_speed
9 +1 - - iflags Instrument Status and Quality Flags
Source: GDR-F
Original-Parameter: agc_ku, agc_rms_ku, alt_state_flag_oper, range_numval_ku, rain_flag,ice_flag
Flags:
1 : agc_ku in [32767,0] or agc_rms_ku in [32767,0] or agc_rms_ku/agc_ku > 0.1
2 : swh_ku in [32767,0] or swh_rms_ku in [32767,0] or swh_rms_ku/swh_ku > 0.1
4 : alt_state_flag_oper == 1 (0: SideA, 1: SideB)
8 : range_numval_ku < 12
16 : alt_state_flag_oper == 2 (0: Topex, 1: Poseidon)
64 : rain_flag != 0 or ice_flag != 0
128 : range_ku == nan or range_rms_ku == nan

Topex | GDR-F | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
[tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. [leap_second] is the UTC time at which a leap second occurs in the data set, if any. After this UTC time, the tai_utc_difference is increased by 1 second.
Source: GDR-F
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
[tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. [leap_second] is the UTC time at which a leap second occurs in the data set, if any. After this UTC time, the tai_utc_difference is increased by 1 second.
Source: GDR-F
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
20 Hz Ku-band MLE4 range. Net instrument range correction (net_instr_cor_range_ku) has been added.
Source: GDR-F
Original-Parameter: range_20hz_ku
4 +2 -3 m stdalt RMS of Altimeter Range
RMS of 20 Hz Ku-band MLE4 range measurements. Only valid 20 Hz measurements are used to compute this element.
Source: GDR-F
Original-Parameter: range_rms_ku
5 2 -2 m swh Significant Wave Height
20 Hz Ku-band MLE4 significant waveheight. Instrumental corrections are not required.
Source: GDR-F
Original-Parameter: swh_20hz_ku
6 +2 -2 m stdswh RMS of Significant Wave Height
RMS of 20 Hz Ku-band MLE4 significant waveheight measurements. Only valid 20 Hz measurements are used to compute this element.
Source: GDR-F
Original-Parameter: swh_rms_ku
7 +2 -2 db sigma0 Backscatter Coefficient
Sum of Ku-band AGC, MLE-4 retracked Ku-band echoes amplitude correction (including Ku-band point target response correction, given in net_instr_cor_sig0_ku), amplitude correction to account for satellite altitude, atmospheric attenuation (rad_atm_cor_sig0_ku), and constant Ku-band bias to align with original geophysical data record from side B.
Source: GDR-F
Original-Parameter: sig0_20hz_ku
8 +1 -1 m/s windsp Wind Speed
Sea surface wind speed.
Source: GDR-F
Original-Parameter: rad_wind_speed
9 +1 - - iflags Instrument Status and Quality Flags
Source: GDR-F
Original-Parameter: agc_20hz_ku, agc_rms_ku, alt_state_flag_oper, range_numval_ku, rain_flag,ice_flag
Flags:
1 : agc_20hz_ku in [32767,0] or agc_rms_ku in [32767,0] or agc_rms_ku/agc_20hz_ku > 0.1
2 : swh_ku in [32767,0] or swh_rms_ku in [32767,0] or swh_rms_ku/swh_ku > 0.1
4 : alt_state_flag_oper == 1 (0: SideA, 1: SideB)
8 : range_numval_ku < 12
16 : alt_state_flag_oper == 2 (0: Topex, 1: Poseidon)
64 : rain_flag != 0 or ice_flag != 0
128 : range_ku == nan or range_rms_ku == nan
Version 01

Cryosat-2 (SAR) | SGDR-E | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
4 +2 -3 m stdalt RMS of Altimeter Range
5 2 -2 m swh Significant Wave Height
6 +2 -2 m stdswh RMS of Significant Wave Height
7 +2 -2 db sigma0 Backscatter Coefficient
8 +1 -1 m/s windsp Wind Speed
9 +1 - - iflags Instrument Status and Quality Flags

Cryosat-2 (SAR, Extended Mission) | SGDR-E | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
4 +2 -3 m stdalt RMS of Altimeter Range
5 2 -2 m swh Significant Wave Height
6 +2 -2 m stdswh RMS of Significant Wave Height
7 +2 -2 db sigma0 Backscatter Coefficient
8 +1 -1 m/s windsp Wind Speed
9 +1 - - iflags Instrument Status and Quality Flags

ERS-1 (Phase A) | SGDR/REAPER | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: ice1_range_20hz
4 +2 -3 m stdalt RMS of Altimeter Range
n.a.
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh_20hz
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: ice1_sig0_20hz
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ralt
Flags:
2: swh == 0 or swh_rms/swh > 0.1
128 : ralt == nan

ERS-1 (Phase B) | SGDR/REAPER | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: ice1_range_20hz
4 +2 -3 m stdalt RMS of Altimeter Range
n.a.
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh_20hz
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: ice1_sig0_20hz
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ralt
Flags:
2: swh == 0 or swh_rms/swh > 0.1
128 : ralt == nan

ERS-1 (Phase C) | SGDR/REAPER | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: ice1_range_20hz
4 +2 -3 m stdalt RMS of Altimeter Range
n.a.
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh_20hz
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: ice1_sig0_20hz
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ralt
Flags:
2: swh == 0 or swh_rms/swh > 0.1
128 : ralt == nan

ERS-1 (Phase D) | SGDR/REAPER | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: ice1_range_20hz
4 +2 -3 m stdalt RMS of Altimeter Range
n.a.
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh_20hz
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: ice1_sig0_20hz
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ralt
Flags:
2: swh == 0 or swh_rms/swh > 0.1
128 : ralt == nan

ERS-1 (Phase E) | SGDR/REAPER | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: ice1_range_20hz
4 +2 -3 m stdalt RMS of Altimeter Range
n.a.
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh_20hz
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: ice1_sig0_20hz
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ralt
Flags:
2: swh == 0 or swh_rms/swh > 0.1
128 : ralt == nan

ERS-1 (Phase F) | SGDR/REAPER | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: ice1_range_20hz
4 +2 -3 m stdalt RMS of Altimeter Range
n.a.
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh_20hz
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: ice1_sig0_20hz
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ralt
Flags:
2: swh == 0 or swh_rms/swh > 0.1
128 : ralt == nan

ERS-1 (Phase G) | SGDR/REAPER | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: ice1_range_20hz
4 +2 -3 m stdalt RMS of Altimeter Range
n.a.
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh_20hz
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: ice1_sig0_20hz
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ralt
Flags:
2: swh == 0 or swh_rms/swh > 0.1
128 : ralt == nan

ERS-2 | SGDR/REAPER | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: ice1_range_20hz
4 +2 -3 m stdalt RMS of Altimeter Range
n.a.
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh_20hz
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: ice1_sig0_20hz
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ralt
Flags:
2: swh == 0 or swh_rms/swh > 0.1
128 : ralt == nan

Envisat | SGDR v2.1 | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
18 Hz Ku-band ice1 ranges
Source: SGDR v2.1
Original-Parameter: hz18_ku_band_ice1 (Field number 27)
4 +2 -3 m stdalt RMS of Altimeter Range
Source: SGDR-D
5 2 -2 m swh Significant Wave Height
Significant Wave Height from Ku-Band
Source: SGDR v2.1
Original-Parameter: ku_sig_wv_ht (Field number 54)
6 +2 -2 m stdswh RMS of Significant Wave Height
Standard deviation of 18hz ku-band significant wave height
Source: SGDR v2.1
Original-Parameter: sd_18hz_ku_swh (Field number 56)
7 +2 -2 db sigma0 Backscatter Coefficient
18 Hz ku-band ice1 backscatter coefficient
Source: SGDR v2.1
Original-Parameter: hz18_ku_ice1_bscat (Field number 78)
8 +1 -1 m/s windsp Wind Speed
Wind Speed from RA2
Source: SGDR v2.1
Original-Parameter: ra2_wind_sp (Field number 112)
9 +1 - - iflags Instrument Status and Quality Flags

Jason-2 | SGDR-D | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
4 +2 -3 m stdalt RMS of Altimeter Range
5 2 -2 m swh Significant Wave Height
Significant Wave Height from Ku-Band
Source: SGDR-D
Original-Parameter: swh_20hz_ku
6 +2 -2 m stdswh RMS of Significant Wave Height
7 +2 -2 db sigma0 Backscatter Coefficient
8 +1 -1 m/s windsp Wind Speed
Wind Speed from RA2
Source: SGDR-D
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags

Jason-2 | SGDR-D | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
20 Hz Ku band corrected altimeter range (ice retracking)
Source: SGDR-D
Original-Parameter: ice_range_20hz_ku
4 +2 -3 m stdalt RMS of Altimeter Range
Source: SGDR-D
Original-Parameter: range_rms_ku
5 2 -2 m swh Significant Wave Height
6 +2 -2 m stdswh RMS of Significant Wave Height
RMS of the Ku band significant waveheight
Source: SGDR-D
Original-Parameter: swh_rms_ku
7 +2 -2 db sigma0 Backscatter Coefficient
20 Hz Ku band corrected backscatter coefficient (ice retracking)
Source: SGDR-D
Original-Parameter: ice_sig0_20hz_ku
8 +1 -1 m/s windsp Wind Speed
9 +1 - - iflags Instrument Status and Quality Flags

Jason-3 (Extended Mission) | SGDR-F | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec None
2 +4 -6 sec msec None
3 +4 -3 m ralt None
4 +2 -3 m stdalt None
5 2 -2 m swh None
6 +2 -2 m stdswh None
7 +2 -2 db sigma0 None
8 +1 -1 m/s windsp None
9 +1 - - iflags None

Jason-3 (Extended Mission) | SGDR-F | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time of measurement in seconds in the UTC time scale since 1 Jan 2000 00:00:00 UTC. [tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. If a leap second occurs within the data set, the attribute [leap_second] is set to the UTC time at which the leap second occurs
Source: SGDR-F
Original-Parameter: data_01/time
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time of measurement in seconds in the UTC time scale since 1 Jan 2000 00:00:00 UTC. [tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. If a leap second occurs within the data set, the attribute [leap_second] is set to the UTC time at which the leap second occurs
Source: SGDR-F
Original-Parameter: data_01/time
3 +4 -3 m ralt Altimeter Range
Named ice_range_20hz_ku in GDR-D standard. Distance antenna-COG (/data_01/range_cor_cog), USO drift correction (/data_01/range_cor_uso), internal path correction (/data_01/ku/range_cor_internal_path), Doppler correction (/data_01/ku/range_cor_doppler) and system bias included
Source: SGDR-F
Original-Parameter: data_20/ku/range_ocog
4 +2 -3 m stdalt RMS of Altimeter Range
n.a.
5 2 -2 m swh Significant Wave Height
n.a.
6 +2 -2 m stdswh RMS of Significant Wave Height
n.a.
7 +2 -2 db sigma0 Backscatter Coefficient
Named ice_sig0_20hz_ku in GDR-D standard. AGC instrumental errors correction and internal calibration correction (/data_01/ku/sig0_cor_calibration) included
Source: SGDR-F
Original-Parameter: data_20/ku/sig0_ocog
8 +1 -1 m/s windsp Wind Speed
n.a.
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR-F
Original-Parameter: data_20/ku/agc
Flags:
1 : agc in [0,32767]
128 : range_ocog == 2147483647

Jason-3 | SGDR-D | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
4 +2 -3 m stdalt RMS of Altimeter Range
5 2 -2 m swh Significant Wave Height
Significant Wave Height from Ku-Band
Source: SGDR-D
Original-Parameter: swh_20hz_ku
6 +2 -2 m stdswh RMS of Significant Wave Height
7 +2 -2 db sigma0 Backscatter Coefficient
8 +1 -1 m/s windsp Wind Speed
Wind Speed from RA2
Source: wind_speed_alt
Original-Parameter: SGDR-D
9 +1 - - iflags Instrument Status and Quality Flags

Jason-3 | SGDR-D | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
20 Hz Ku band corrected altimeter range (ice retracking)
Source: SGDR-D
Original-Parameter: ice_range_20hz_ku
4 +2 -3 m stdalt RMS of Altimeter Range
Source: SGDR-D
Original-Parameter: range_rms_ku
5 2 -2 m swh Significant Wave Height
6 +2 -2 m stdswh RMS of Significant Wave Height
RMS of the Ku band significant waveheight
Source: SGDR-D
Original-Parameter: swh_rms_ku
7 +2 -2 db sigma0 Backscatter Coefficient
20 Hz Ku band corrected backscatter coefficient (ice retracking)
Source: SGDR-D
Original-Parameter: ice_sig0_20hz_ku
8 +1 -1 m/s windsp Wind Speed
9 +1 - - iflags Instrument Status and Quality Flags

Jason-3 | SGDR-F | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time of measurement in seconds in the UTC time scale since 1 Jan 2000 00:00:00 UTC. [tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. If a leap second occurs within the data set, the attribute [leap_second] is set to the UTC time at which the leap second occurs
Source: SGDR-F
Original-Parameter: data_01/time
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time of measurement in seconds in the UTC time scale since 1 Jan 2000 00:00:00 UTC. [tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. If a leap second occurs within the data set, the attribute [leap_second] is set to the UTC time at which the leap second occurs
Source: SGDR-F
Original-Parameter: data_01/time
3 +4 -3 m ralt Altimeter Range
Named ice_range_20hz_ku in GDR-D standard. Distance antenna-COG (/data_01/range_cor_cog), USO drift correction (/data_01/range_cor_uso), internal path correction (/data_01/ku/range_cor_internal_path), Doppler correction (/data_01/ku/range_cor_doppler) and system bias included
Source: SGDR-F
Original-Parameter: data_20/ku/range_ocog
4 +2 -3 m stdalt RMS of Altimeter Range
n.a.
5 2 -2 m swh Significant Wave Height
n.a.
6 +2 -2 m stdswh RMS of Significant Wave Height
n.a.
7 +2 -2 db sigma0 Backscatter Coefficient
Named ice_sig0_20hz_ku in GDR-D standard. AGC instrumental errors correction and internal calibration correction (/data_01/ku/sig0_cor_calibration) included
Source: SGDR-F
Original-Parameter: data_20/ku/sig0_ocog
8 +1 -1 m/s windsp Wind Speed
n.a.
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR-F
Original-Parameter: data_20/ku/agc
Flags:
1 : agc in [0,32767]
128 : range_ocog == 2147483647

Sentinel-6A (HR) | NTC/F08 | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
It contains the seconds since 1 Jan 2000 00:00:00. Time is in UTC. Time refers to the instant the L1B waveform (which is a combination of echoes for both LR and HR) touches the surface. Whenever a leap second occurs, the attribute leap_second will be set to the appropriate value
Source: NTC/F08
Original-Parameter: data_20/ku/time
2 +4 -6 sec msec Microseconds, Fractional Part of isec
It contains the seconds since 1 Jan 2000 00:00:00. Time is in UTC. Time refers to the instant the L1B waveform (which is a combination of echoes for both LR and HR) touches the surface. Whenever a leap second occurs, the attribute leap_second will be set to the appropriate value
Source: NTC/F08
Original-Parameter: data_20/ku/time
3 +4 -3 m ralt Altimeter Range
Corrected OCOG altimeter range. This includes the instrumental corrections in tracker_range_calibrated.
Source: NTC/F08
Original-Parameter: data_20/ku/range_ocog
4 +2 -3 m stdalt RMS of Altimeter Range
n.a.
5 2 -2 m swh Significant Wave Height
n.a.
6 +2 -2 m stdswh RMS of Significant Wave Height
n.a.
7 +2 -2 db sigma0 Backscatter Coefficient
Backscatter coefficient computed from OCOG retracking. It includes all calibrated instrument gains from L1B power_scaling_to_antenna plus geometry and antenna gain from sig0_scaling_factor
Source: NTC/F08
Original-Parameter: data_20/ku/sig0_ocog
8 +1 -1 m/s windsp Wind Speed
n.a.
9 +1 - - iflags Instrument Status and Quality Flags
Source: NTC/F08
Original-Parameter: data_20/ku/swh_ocean, data_20/ku/range_ocean
Flags:
2: swh_ocean in [0,32767]
128 : range_ocean = nan

Sentinel-6A (LR) | NTC/F08 | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
It contains the seconds since 1 Jan 2000 00:00:00. Time is in UTC. Time refers to the instant the L1B waveform (which is a combination of echoes for both LR and HR) touches the surface. Whenever a leap second occurs, the attribute leap_second will be set to the appropriate value
Source: NTC/F08
Original-Parameter: data_20/ku/time
2 +4 -6 sec msec Microseconds, Fractional Part of isec
It contains the seconds since 1 Jan 2000 00:00:00. Time is in UTC. Time refers to the instant the L1B waveform (which is a combination of echoes for both LR and HR) touches the surface. Whenever a leap second occurs, the attribute leap_second will be set to the appropriate value
Source: NTC/F08
Original-Parameter: data_20/ku/time
3 +4 -3 m ralt Altimeter Range
Corrected OCOG altimeter range. This includes the instrumental corrections in tracker_range_calibrated.
Source: NTC/F08
Original-Parameter: data_20/ku/range_ocog
4 +2 -3 m stdalt RMS of Altimeter Range
n.a.
5 2 -2 m swh Significant Wave Height
n.a.
6 +2 -2 m stdswh RMS of Significant Wave Height
n.a.
7 +2 -2 db sigma0 Backscatter Coefficient
Backscatter coefficient computed from OCOG retracking. It includes all calibrated instrument gains from L1B power_scaling_to_antenna plus geometry and antenna gain from sig0_scaling_factor
Source: NTC/F08
Original-Parameter: data_20/ku/sig0_ocog
8 +1 -1 m/s windsp Wind Speed
n.a.
9 +1 - - iflags Instrument Status and Quality Flags
Source: NTC/F08
Original-Parameter: data_20/ku/swh_ocean, data_20/ku/range_ocean
Flags:
2: swh_ocean in [0,32767]
128 : range_ocean = nan

Topex (Extended Mission) | GDR-F | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
[tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. [leap_second] is the UTC time at which a leap second occurs in the data set, if any. After this UTC time, the tai_utc_difference is increased by 1 second.
Source: GDR-F
Original-Parameter: time
2 +4 -6 sec msec Microseconds, Fractional Part of isec
[tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. [leap_second] is the UTC time at which a leap second occurs in the data set, if any. After this UTC time, the tai_utc_difference is increased by 1 second.
Source: GDR-F
Original-Parameter: time
3 +4 -3 m ralt Altimeter Range
1 Hz Ku-band MLE3 range. Net instrument correction (net_instr_cor_range_ku_mle3) has been added.
Source: GDR-F
Original-Parameter: range_ku_mle3
4 +2 -3 m stdalt RMS of Altimeter Range
RMS of 20 Hz Ku-band MLE3 range measurements. Only valid 20 Hz measurements are used to compute this element.
Source: GDR-F
Original-Parameter: range_rms_ku_mle3
5 2 -2 m swh Significant Wave Height
1 Hz Ku-band MLE3 significant waveheight. Instrumental corrections are not required.
Source: GDR-F
Original-Parameter: swh_ku_mle3
6 +2 -2 m stdswh RMS of Significant Wave Height
RMS of 20 Hz Ku-band MLE3 significant waveheight measurements. Only valid 20 Hz measurements are used to compute this element.
Source: GDR-F
Original-Parameter: swh_rms_ku_mle3
7 +2 -2 db sigma0 Backscatter Coefficient
Sum of Ku-band AGC, MLE-3 retracked Ku-band echoes amplitude correction (including Ku-band point target response correction, given in net_instr_cor_sig0_ku_mle3), amplitude correction to account for satellite altitude, atmospheric attenuation (rad_atm_cor_sig0_ku), and constant Ku-band bias to align with original geophysical data record from side B.
Source: GDR-F
Original-Parameter: sig0_ku_mle3
8 +1 -1 m/s windsp Wind Speed
Sea surface wind speed.
Source: GDR-F
Original-Parameter: rad_wind_speed
9 +1 - - iflags Instrument Status and Quality Flags
Source: GDR-F
Original-Parameter: agc_ku, agc_rms_ku, alt_state_flag_oper, range_numval_ku_mle3, rain_flag,ice_flag
Flags:
1 : agc_ku in [32767,0] or agc_rms_ku in [32767,0] or agc_rms_ku/agc_ku > 0.1
2 : swh_ku_mle3 in [32767,0] or swh_rms_ku_mle3 in [32767,0] or swh_rms_ku_mle3/swh_ku_mle3 > 0.1
4 : alt_state_flag_oper == 1 (0: SideA, 1: SideB)
8 : range_numval_ku_mle3 < 12
16 : alt_state_flag_oper == 2 (0: Topex, 1: Poseidon)
64 : rain_flag != 0 or ice_flag != 0
128 : range_ku_mle3 == nan or range_rms_ku_mle3 == nan

Topex (Extended Mission) | GDR-F | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
[tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. [leap_second] is the UTC time at which a leap second occurs in the data set, if any. After this UTC time, the tai_utc_difference is increased by 1 second.
Source: GDR-F
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
[tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. [leap_second] is the UTC time at which a leap second occurs in the data set, if any. After this UTC time, the tai_utc_difference is increased by 1 second.
Source: GDR-F
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
20 Hz Ku-band MLE3 range. Net instrument range correction (net_instr_cor_range_ku_mle3) has been added.
Source: GDR-F
Original-Parameter: range_20hz_ku_mle3
4 +2 -3 m stdalt RMS of Altimeter Range
RMS of 20 Hz Ku-band MLE3 range measurements. Only valid 20 Hz measurements are used to compute this element.
Source: GDR-F
Original-Parameter: range_rms_ku_mle3
5 2 -2 m swh Significant Wave Height
20 Hz Ku-band MLE3 significant waveheight. Instrumental corrections are not required.
Source: GDR-F
Original-Parameter: swh_20hz_ku_mle3
6 +2 -2 m stdswh RMS of Significant Wave Height
RMS of 20 Hz Ku-band MLE3 significant waveheight measurements. Only valid 20 Hz measurements are used to compute this element.
Source: GDR-F
Original-Parameter: swh_rms_ku_mle3
7 +2 -2 db sigma0 Backscatter Coefficient
Sum of Ku-band AGC, MLE-3 retracked Ku-band echoes amplitude correction (including Ku-band point target response correction, given in net_instr_cor_sig0_ku_mle3), amplitude correction to account for satellite altitude, atmospheric attenuation (rad_atm_cor_sig0_ku), and constant Ku-band bias to align with original geophysical data record from side B.
Source: GDR-F
Original-Parameter: sig0_20hz_ku_mle3
8 +1 -1 m/s windsp Wind Speed
Sea surface wind speed.
Source: GDR-F
Original-Parameter: rad_wind_speed
9 +1 - - iflags Instrument Status and Quality Flags
Source: GDR-F
Original-Parameter: agc_20hz_ku, agc_rms_ku, alt_state_flag_oper, range_numval_ku_mle3, rain_flag,ice_flag
Flags:
1 : agc_20hz_ku in [32767,0] or agc_rms_ku in [32767,0] or agc_rms_ku/agc_20hz_ku > 0.1
2 : swh_ku_mle3 in [32767,0] or swh_rms_ku_mle3 in [32767,0] or swh_rms_ku_mle3/swh_ku_mle3 > 0.1
4 : alt_state_flag_oper == 1 (0: SideA, 1: SideB)
8 : range_numval_ku_mle3 < 12
16 : alt_state_flag_oper == 2 (0: Topex, 1: Poseidon)
64 : rain_flag != 0 or ice_flag != 0
128 : range_ku == nan or range_rms_ku_mle3 == nan

Topex | GDR-F | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
[tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. [leap_second] is the UTC time at which a leap second occurs in the data set, if any. After this UTC time, the tai_utc_difference is increased by 1 second.
Source: GDR-F
Original-Parameter: time
2 +4 -6 sec msec Microseconds, Fractional Part of isec
[tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. [leap_second] is the UTC time at which a leap second occurs in the data set, if any. After this UTC time, the tai_utc_difference is increased by 1 second.
Source: GDR-F
Original-Parameter: time
3 +4 -3 m ralt Altimeter Range
1 Hz Ku-band MLE3 range. Net instrument correction (net_instr_cor_range_ku_mle3) has been added.
Source: GDR-F
Original-Parameter: range_ku_mle3
4 +2 -3 m stdalt RMS of Altimeter Range
RMS of 20 Hz Ku-band MLE3 range measurements. Only valid 20 Hz measurements are used to compute this element.
Source: GDR-F
Original-Parameter: range_rms_ku_mle3
5 2 -2 m swh Significant Wave Height
1 Hz Ku-band MLE3 significant waveheight. Instrumental corrections are not required.
Source: GDR-F
Original-Parameter: swh_ku_mle3
6 +2 -2 m stdswh RMS of Significant Wave Height
RMS of 20 Hz Ku-band MLE3 significant waveheight measurements. Only valid 20 Hz measurements are used to compute this element.
Source: GDR-F
Original-Parameter: swh_rms_ku_mle3
7 +2 -2 db sigma0 Backscatter Coefficient
Sum of Ku-band AGC, MLE-3 retracked Ku-band echoes amplitude correction (including Ku-band point target response correction, given in net_instr_cor_sig0_ku_mle3), amplitude correction to account for satellite altitude, atmospheric attenuation (rad_atm_cor_sig0_ku), and constant Ku-band bias to align with original geophysical data record from side B.
Source: GDR-F
Original-Parameter: sig0_ku_mle3
8 +1 -1 m/s windsp Wind Speed
Sea surface wind speed.
Source: GDR-F
Original-Parameter: rad_wind_speed
9 +1 - - iflags Instrument Status and Quality Flags
Source: GDR-F
Original-Parameter: agc_ku, agc_rms_ku, alt_state_flag_oper, range_numval_ku_mle3, rain_flag,ice_flag
Flags:
1 : agc_ku in [32767,0] or agc_rms_ku in [32767,0] or agc_rms_ku/agc_ku > 0.1
2 : swh_ku_mle3 in [32767,0] or swh_rms_ku_mle3 in [32767,0] or swh_rms_ku_mle3/swh_ku_mle3 > 0.1
4 : alt_state_flag_oper == 1 (0: SideA, 1: SideB)
8 : range_numval_ku_mle3 < 12
16 : alt_state_flag_oper == 2 (0: Topex, 1: Poseidon)
64 : rain_flag != 0 or ice_flag != 0
128 : range_ku_mle3 == nan or range_rms_ku_mle3 == nan

Topex | GDR-F | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
[tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. [leap_second] is the UTC time at which a leap second occurs in the data set, if any. After this UTC time, the tai_utc_difference is increased by 1 second.
Source: GDR-F
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
[tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. [leap_second] is the UTC time at which a leap second occurs in the data set, if any. After this UTC time, the tai_utc_difference is increased by 1 second.
Source: GDR-F
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
20 Hz Ku-band MLE3 range. Net instrument range correction (net_instr_cor_range_ku_mle3) has been added.
Source: GDR-F
Original-Parameter: range_20hz_ku_mle3
4 +2 -3 m stdalt RMS of Altimeter Range
RMS of 20 Hz Ku-band MLE3 range measurements. Only valid 20 Hz measurements are used to compute this element.
Source: GDR-F
Original-Parameter: range_rms_ku_mle3
5 2 -2 m swh Significant Wave Height
20 Hz Ku-band MLE3 significant waveheight. Instrumental corrections are not required.
Source: GDR-F
Original-Parameter: swh_20hz_ku_mle3
6 +2 -2 m stdswh RMS of Significant Wave Height
RMS of 20 Hz Ku-band MLE3 significant waveheight measurements. Only valid 20 Hz measurements are used to compute this element.
Source: GDR-F
Original-Parameter: swh_rms_ku_mle3
7 +2 -2 db sigma0 Backscatter Coefficient
Sum of Ku-band AGC, MLE-3 retracked Ku-band echoes amplitude correction (including Ku-band point target response correction, given in net_instr_cor_sig0_ku_mle3), amplitude correction to account for satellite altitude, atmospheric attenuation (rad_atm_cor_sig0_ku), and constant Ku-band bias to align with original geophysical data record from side B.
Source: GDR-F
Original-Parameter: sig0_20hz_ku_mle3
8 +1 -1 m/s windsp Wind Speed
Sea surface wind speed.
Source: GDR-F
Original-Parameter: rad_wind_speed
9 +1 - - iflags Instrument Status and Quality Flags
Source: GDR-F
Original-Parameter: agc_20hz_ku, agc_rms_ku, alt_state_flag_oper, range_numval_ku_mle3, rain_flag,ice_flag
Flags:
1 : agc_20hz_ku in [32767,0] or agc_rms_ku in [32767,0] or agc_rms_ku/agc_20hz_ku > 0.1
2 : swh_ku_mle3 in [32767,0] or swh_rms_ku_mle3 in [32767,0] or swh_rms_ku_mle3/swh_ku_mle3 > 0.1
4 : alt_state_flag_oper == 1 (0: SideA, 1: SideB)
8 : range_numval_ku_mle3 < 12
16 : alt_state_flag_oper == 2 (0: Topex, 1: Poseidon)
64 : rain_flag != 0 or ice_flag != 0
128 : range_ku == nan or range_rms_ku_mle3 == nan
Version 02

ERS-1 (Phase A) | SGDR/REAPER | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: ice2_range_20hz
4 +2 -3 m stdalt RMS of Altimeter Range
n.a.
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh_20hz
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: ice2_sig0_20hz
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ralt
Flags:
2: swh == 0 or swh_rms/swh > 0.1
128 : ralt == nan

ERS-1 (Phase B) | SGDR/REAPER | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: ice2_range_20hz
4 +2 -3 m stdalt RMS of Altimeter Range
n.a.
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh_20hz
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: ice2_sig0_20hz
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ralt
Flags:
2: swh == 0 or swh_rms/swh > 0.1
128 : ralt == nan

ERS-1 (Phase C) | SGDR/REAPER | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: ice2_range_20hz
4 +2 -3 m stdalt RMS of Altimeter Range
n.a.
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh_20hz
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: ice2_sig0_20hz
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ralt
Flags:
2: swh == 0 or swh_rms/swh > 0.1
128 : ralt == nan

ERS-1 (Phase D) | SGDR/REAPER | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: ice2_range_20hz
4 +2 -3 m stdalt RMS of Altimeter Range
n.a.
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh_20hz
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: ice2_sig0_20hz
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ralt
Flags:
2: swh == 0 or swh_rms/swh > 0.1
128 : ralt == nan

ERS-1 (Phase E) | SGDR/REAPER | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: ice2_range_20hz
4 +2 -3 m stdalt RMS of Altimeter Range
n.a.
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh_20hz
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: ice2_sig0_20hz
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ralt
Flags:
2: swh == 0 or swh_rms/swh > 0.1
128 : ralt == nan

ERS-1 (Phase F) | SGDR/REAPER | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: ice2_range_20hz
4 +2 -3 m stdalt RMS of Altimeter Range
n.a.
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh_20hz
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: ice2_sig0_20hz
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ralt
Flags:
2: swh == 0 or swh_rms/swh > 0.1
128 : ralt == nan

ERS-1 (Phase G) | SGDR/REAPER | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: ice2_range_20hz
4 +2 -3 m stdalt RMS of Altimeter Range
n.a.
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh_20hz
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: ice2_sig0_20hz
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ralt
Flags:
2: swh == 0 or swh_rms/swh > 0.1
128 : ralt == nan

ERS-2 | SGDR/REAPER | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: ice2_range_20hz
4 +2 -3 m stdalt RMS of Altimeter Range
n.a.
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh_20hz
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: ice2_sig0_20hz
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ralt
Flags:
2: swh == 0 or swh_rms/swh > 0.1
128 : ralt == nan

Envisat | SGDR v2.1 | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
4 +2 -3 m stdalt RMS of Altimeter Range
5 2 -2 m swh Significant Wave Height
6 +2 -2 m stdswh RMS of Significant Wave Height
7 +2 -2 db sigma0 Backscatter Coefficient
8 +1 -1 m/s windsp Wind Speed
9 +1 - - iflags Instrument Status and Quality Flags

Envisat | SGDR v2.1 | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
18 Hz Ku-band ice2 ranges
Source: SGDR v2.1
Original-Parameter: hz18_ku_band_ice2 (Field number 29)
4 +2 -3 m stdalt RMS of Altimeter Range
5 2 -2 m swh Significant Wave Height
Significant Wave Height from Ku-Band
Source: SGDR v2.1
Original-Parameter: ku_sig_wv_ht (Field number 54)
6 +2 -2 m stdswh RMS of Significant Wave Height
Standard deviation of 18hz ku-band significant wave height
Source: SGDR v2.1
Original-Parameter: sd_18hz_ku_swh (Field number 56)
7 +2 -2 db sigma0 Backscatter Coefficient
18 Hz ku-band ice2 backscatter coefficient
Source: SGDR v2.1
Original-Parameter: hz18_ku_ice2_bscat (Field number 82)
8 +1 -1 m/s windsp Wind Speed
Wind Speed from RA2
Source: SGDR v2.1
Original-Parameter: ra2_wind_sp
9 +1 - - iflags Instrument Status and Quality Flags

Jason-2 | SGDR-D | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
20 Hz Ku band corrected altimeter range (MLE3 retracking)
Source: SGDR-D
Original-Parameter: range_20hz_ku_mle3
4 +2 -3 m stdalt RMS of Altimeter Range
RMS of the Ku band range (MLE3 retracking)
Source: SGDR-D
Original-Parameter: range_rms_ku_mle3
5 2 -2 m swh Significant Wave Height
Significant Wave Height from Ku-Bnad
Source: SGDR-D
Original-Parameter: swh_20hz_ku_mle3
6 +2 -2 m stdswh RMS of Significant Wave Height
RMS of the Ku band significant waveheight (MLE3 retracking)
Source: SGDR-D
Original-Parameter: swh_rms_ku_mle3
7 +2 -2 db sigma0 Backscatter Coefficient
20 Hz Ku band corrected backscatter coefficient (MLE3 retracking)
Source: SGDR-D
Original-Parameter: sig0_20hz_ku_mle3
8 +1 -1 m/s windsp Wind Speed
Wind Speed from RA2
Source: SGDR-D
Original-Parameter: wind_speed_alt_mle3
9 +1 - - iflags Instrument Status and Quality Flags

Jason-3 (Extended Mission) | SGDR-F | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time of measurement in seconds in the UTC time scale since 1 Jan 2000 00:00:00 UTC. [tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. If a leap second occurs within the data set, the attribute [leap_second] is set to the UTC time at which the leap second occurs
Source: SGDR-F
Original-Parameter: data_01/time
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time of measurement in seconds in the UTC time scale since 1 Jan 2000 00:00:00 UTC. [tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. If a leap second occurs within the data set, the attribute [leap_second] is set to the UTC time at which the leap second occurs
Source: SGDR-F
Original-Parameter: data_01/time
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, i.e. distance antenna-COG (/data_01/range_cor_cog), USO drift correction (/data_01/range_cor_uso), internal path correction (range_cor_internal_path), Doppler correction (range_cor_doppler) and system bias
Source: SGDR-F
Original-Parameter: data_01/ku/range_adaptive
4 +2 -3 m stdalt RMS of Altimeter Range
Compression of Ku band high rate elements is preceded by a detection of outliers. Only valid high-rate values are used to compute this element
Source: SGDR-F
Original-Parameter: data_01/ku/range_adaptive_rms
5 2 -2 m swh Significant Wave Height
Source: SGDR-F
Original-Parameter: data_01/ku/swh_adaptive
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku band high rate elements is preceded by a detection of outliers. Only valid high-rate values are used to compute this element
Source: SGDR-F
Original-Parameter: data_01/ku/swh_adaptive_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, excepted the system bias, i.e. AGC instrumental errors correction, internal calibration correction (sig0_cor_calibration) and atmospheric attenuation (sig0_cor_atm)
Source: SGDR-F
Original-Parameter: data_01/ku/sig0_adaptive
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See Jason-3 User Handbook. A calibration bias of +0.08 dB has been added to the Ku band backscatter coefficient (/data_01/ku/sig0_adaptive) before computing the wind speed
Source: SGDR-F
Original-Parameter: data_01/wind_speed_alt_adaptive
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR-F
Original-Parameter: data_01/ku/agc, data_01/ku/agc_rms, data_01/ku/range_adaptive_numval, data_01/rain_flag, data_01/ice_flag
Flags:
1 : agc_rms in [0,32767] or agc in [0,32767] or agc_rms/agc > 0.1
2 : swh_ocean_rms in [0,32767] or swh_ocean in [0,32767] or swh_ocean_rms/swh_ocean > 0.1
8 : range_adaptive_numval < 12
64 : rain_flag != 0 or ice_flag != 0
128 : range_ocean = 2147483647 or range_ocean_rms == 2147483647

Jason-3 (Extended Mission) | SGDR-F | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Named time_20hz in GDR-D standard. Time of measurement in seconds in the UTC time scale since 1 Jan 2000 00:00:00 UTC. [tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. If a leap second occurs within the data set, the attribute [leap_second] is set to the UTC time at which the leap second occurs
Source: SGDR-F
Original-Parameter: data_20/time
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Named time_20hz in GDR-D standard. Time of measurement in seconds in the UTC time scale since 1 Jan 2000 00:00:00 UTC. [tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. If a leap second occurs within the data set, the attribute [leap_second] is set to the UTC time at which the leap second occurs
Source: SGDR-F
Original-Parameter: data_20/time
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, i.e. distance antenna-COG (/data_01/range_cor_cog), USO drift correction (/data_01/range_cor_uso), internal path correction (/data_01/ku/range_cor_internal_path), Doppler correction (/data_01/ku/range_cor_doppler) and system bias
Source: SGDR-F
Original-Parameter: data_20/ku/range_adaptive
4 +2 -3 m stdalt RMS of Altimeter Range
Compression of Ku band high rate elements is preceded by a detection of outliers. Only valid high-rate values are used to compute this element
Source: SGDR-F
Original-Parameter: data_01/ku/range_adaptive_rms
5 2 -2 m swh Significant Wave Height
No correction applied
Source: SGDR-F
Original-Parameter: data_20/ku/swh_adaptive
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku band high rate elements is preceded by a detection of outliers. Only valid high-rate values are used to compute this element
Source: SGDR-F
Original-Parameter: data_01/ku/swh_adaptive_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, excepted the system bias, i.e. AGC instrumental errors correction, internal calibration correction (/data_01/ku/sig0_cor_calibration) and atmospheric attenuation (sig0_cor_atm)
Source: SGDR-F
Original-Parameter: data_20/ku/sig0_adaptive
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See Jason-3 User Handbook. A calibration bias of +0.08 dB has been added to the Ku band backscatter coefficient (/data_01/ku/sig0_adaptive) before computing the wind speed
Source: SGDR-F
Original-Parameter: data_01/wind_speed_alt_adaptive
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR-F
Original-Parameter: data_20/ku/agc, data_01/ku/range_adaptive_numval
Flags:
1 : agc in [0,32767]
2 : swh_adaptive in [0,32767]
8: range_adaptive_numval_20hz < 12
128 : range_adaptive == 2147483647

Jason-3 | SGDR-F | 1Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time of measurement in seconds in the UTC time scale since 1 Jan 2000 00:00:00 UTC. [tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. If a leap second occurs within the data set, the attribute [leap_second] is set to the UTC time at which the leap second occurs
Source: SGDR-F
Original-Parameter: data_01/time
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time of measurement in seconds in the UTC time scale since 1 Jan 2000 00:00:00 UTC. [tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. If a leap second occurs within the data set, the attribute [leap_second] is set to the UTC time at which the leap second occurs
Source: SGDR-F
Original-Parameter: data_01/time
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, i.e. distance antenna-COG (/data_01/range_cor_cog), USO drift correction (/data_01/range_cor_uso), internal path correction (range_cor_internal_path), Doppler correction (range_cor_doppler) and system bias
Source: SGDR-F
Original-Parameter: data_01/ku/range_adaptive
4 +2 -3 m stdalt RMS of Altimeter Range
Compression of Ku band high rate elements is preceded by a detection of outliers. Only valid high-rate values are used to compute this element
Source: SGDR-F
Original-Parameter: data_01/ku/range_adaptive_rms
5 2 -2 m swh Significant Wave Height
Source: SGDR-F
Original-Parameter: data_01/ku/swh_adaptive
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku band high rate elements is preceded by a detection of outliers. Only valid high-rate values are used to compute this element
Source: SGDR-F
Original-Parameter: data_01/ku/swh_adaptive_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, excepted the system bias, i.e. AGC instrumental errors correction, internal calibration correction (sig0_cor_calibration) and atmospheric attenuation (sig0_cor_atm)
Source: SGDR-F
Original-Parameter: data_01/ku/sig0_adaptive
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See Jason-3 User Handbook. A calibration bias of +0.08 dB has been added to the Ku band backscatter coefficient (/data_01/ku/sig0_adaptive) before computing the wind speed
Source: SGDR-F
Original-Parameter: data_01/wind_speed_alt_adaptive
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR-F
Original-Parameter: data_01/ku/agc, data_01/ku/agc_rms, data_01/ku/range_adaptive_numval, data_01/rain_flag, data_01/ice_flag
Flags:
1 : agc_rms in [0,32767] or agc in [0,32767] or agc_rms/agc > 0.1
2 : swh_ocean_rms in [0,32767] or swh_ocean in [0,32767] or swh_ocean_rms/swh_ocean > 0.1
8 : range_adaptive_numval < 12
64 : rain_flag != 0 or ice_flag != 0
128 : range_ocean = 2147483647 or range_ocean_rms == 2147483647

Jason-3 | SGDR-F | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Named time_20hz in GDR-D standard. Time of measurement in seconds in the UTC time scale since 1 Jan 2000 00:00:00 UTC. [tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. If a leap second occurs within the data set, the attribute [leap_second] is set to the UTC time at which the leap second occurs
Source: SGDR-F
Original-Parameter: data_20/time
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Named time_20hz in GDR-D standard. Time of measurement in seconds in the UTC time scale since 1 Jan 2000 00:00:00 UTC. [tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. If a leap second occurs within the data set, the attribute [leap_second] is set to the UTC time at which the leap second occurs
Source: SGDR-F
Original-Parameter: data_20/time
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, i.e. distance antenna-COG (/data_01/range_cor_cog), USO drift correction (/data_01/range_cor_uso), internal path correction (/data_01/ku/range_cor_internal_path), Doppler correction (/data_01/ku/range_cor_doppler) and system bias
Source: SGDR-F
Original-Parameter: data_20/ku/range_adaptive
4 +2 -3 m stdalt RMS of Altimeter Range
Compression of Ku band high rate elements is preceded by a detection of outliers. Only valid high-rate values are used to compute this element
Source: SGDR-F
Original-Parameter: data_01/ku/range_adaptive_rms
5 2 -2 m swh Significant Wave Height
No correction applied
Source: SGDR-F
Original-Parameter: data_20/ku/swh_adaptive
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku band high rate elements is preceded by a detection of outliers. Only valid high-rate values are used to compute this element
Source: SGDR-F
Original-Parameter: data_01/ku/swh_adaptive_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, excepted the system bias, i.e. AGC instrumental errors correction, internal calibration correction (/data_01/ku/sig0_cor_calibration) and atmospheric attenuation (sig0_cor_atm)
Source: SGDR-F
Original-Parameter: data_20/ku/sig0_adaptive
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See Jason-3 User Handbook. A calibration bias of +0.08 dB has been added to the Ku band backscatter coefficient (/data_01/ku/sig0_adaptive) before computing the wind speed
Source: SGDR-F
Original-Parameter: data_01/wind_speed_alt_adaptive
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR-F
Original-Parameter: data_20/ku/agc, data_01/ku/range_adaptive_numval
Flags:
1 : agc in [0,32767]
2 : swh_adaptive in [0,32767]
8: range_adaptive_numval_20hz < 12
128 : range_adaptive == 2147483647
Version 03

ERS-1 (Phase A) | SGDR/REAPER | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: sitrack_range_20hz
4 +2 -3 m stdalt RMS of Altimeter Range
n.a.
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh_20hz
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: sitrack_sig0_20hz
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ralt
Flags:
2: swh == 0 or swh_rms/swh > 0.1
128 : ralt == nan

ERS-1 (Phase B) | SGDR/REAPER | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: sitrack_range_20hz
4 +2 -3 m stdalt RMS of Altimeter Range
n.a.
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh_20hz
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: sitrack_sig0_20hz
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ralt
Flags:
2: swh == 0 or swh_rms/swh > 0.1
128 : ralt == nan

ERS-1 (Phase C) | SGDR/REAPER | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: sitrack_range_20hz
4 +2 -3 m stdalt RMS of Altimeter Range
n.a.
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh_20hz
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: sitrack_sig0_20hz
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ralt
Flags:
2: swh == 0 or swh_rms/swh > 0.1
128 : ralt == nan

ERS-1 (Phase D) | SGDR/REAPER | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: sitrack_range_20hz
4 +2 -3 m stdalt RMS of Altimeter Range
n.a.
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh_20hz
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: sitrack_sig0_20hz
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ralt
Flags:
2: swh == 0 or swh_rms/swh > 0.1
128 : ralt == nan

ERS-1 (Phase E) | SGDR/REAPER | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: sitrack_range_20hz
4 +2 -3 m stdalt RMS of Altimeter Range
n.a.
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh_20hz
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: sitrack_sig0_20hz
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ralt
Flags:
2: swh == 0 or swh_rms/swh > 0.1
128 : ralt == nan

ERS-1 (Phase F) | SGDR/REAPER | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: sitrack_range_20hz
4 +2 -3 m stdalt RMS of Altimeter Range
n.a.
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh_20hz
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: sitrack_sig0_20hz
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ralt
Flags:
2: swh == 0 or swh_rms/swh > 0.1
128 : ralt == nan

ERS-1 (Phase G) | SGDR/REAPER | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: sitrack_range_20hz
4 +2 -3 m stdalt RMS of Altimeter Range
n.a.
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh_20hz
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: sitrack_sig0_20hz
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ralt
Flags:
2: swh == 0 or swh_rms/swh > 0.1
128 : ralt == nan

ERS-2 | SGDR/REAPER | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Time counted in seconds since 1990-01-01 00:00:00.
Source: SGDR/REAPER
Original-Parameter: time_20hz
3 +4 -3 m ralt Altimeter Range
All instrumental corrections included, and system bias.
Source: SGDR/REAPER
Original-Parameter: sitrack_range_20hz
4 +2 -3 m stdalt RMS of Altimeter Range
n.a.
5 2 -2 m swh Significant Wave Height
Computed directly from sigma c. No bias correction.
Source: SGDR/REAPER
Original-Parameter: swh_20hz
6 +2 -2 m stdswh RMS of Significant Wave Height
Compression of Ku-band high rate elements is preceded by a detection of outliers. Only valid high rate values are used to compute this element.
Source: SGDR/REAPER
Original-Parameter: swh_rms
7 +2 -2 db sigma0 Backscatter Coefficient
All instrumental corrections included, including the system bias and atmospheric attenuation (atmos_corr_sig0). See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: sitrack_sig0_20hz
8 +1 -1 m/s windsp Wind Speed
Should not be used over land. See REAPER User Handbook.
Source: SGDR/REAPER
Original-Parameter: wind_speed_alt
9 +1 - - iflags Instrument Status and Quality Flags
Source: SGDR/REAPER
Original-Parameter: swh, swh_rms, ralt
Flags:
2: swh == 0 or swh_rms/swh > 0.1
128 : ralt == nan

Envisat | SGDR v2.1 | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
18 Hz Ku-band sea-ice ranges
Source: SGDR v2.1
Original-Parameter: hz18_ku_band_seaice (Field number 31)
4 +2 -3 m stdalt RMS of Altimeter Range
5 2 -2 m swh Significant Wave Height
6 +2 -2 m stdswh RMS of Significant Wave Height
Standard deviation of 18hz ku-band significant wave height
Source: SGDR v2.1
Original-Parameter: sd_18hz_ku_swh (Field number 56)
7 +2 -2 db sigma0 Backscatter Coefficient
18 Hz ku-band seaice backscatter coefficient
Source: SGDR v2.1
Original-Parameter: hz18_ku_seaice_bscat (Field number 84)
8 +1 -1 m/s windsp Wind Speed
9 +1 - - iflags Instrument Status and Quality Flags
Version 04

Cryosat-2 (SAR) | SGDR-E | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Source: instr.01 (Cryosat-2 ICE Baseline-E (SAR))
MVA-Parameters:
- Integer Seconds Elapsed Since Epoch (isec.01)
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Source: instr.01 (Cryosat-2 ICE Baseline-E (SAR))
MVA-Parameters:
- Microseconds, Fractional Part of isec (msec.01)
3 +4 -3 m ralt Altimeter Range
Range from SAMOSA+ (sampy) Retracker
Source: From instr.01 (Cryosat-2 ICE Baseline-E (SAR))
MVA-Parameters:
- Altimeter Range (ralt.01)
4 +2 -3 m stdalt RMS of Altimeter Range
Source: instr.01 (Cryosat-2 ICE Baseline-E (SAR))
MVA-Parameters:
- RMS of Altimeter Range (stdalt.01)
5 2 -2 m swh Significant Wave Height
Significant Wave Height from SAMOSA+ (sampy) Retracker
Source: From instr.01 (Cryosat-2 ICE Baseline-E (SAR))
MVA-Parameters:
- Significant Wave Height (swh.01)
6 +2 -2 m stdswh RMS of Significant Wave Height
Source: instr.01 (Cryosat-2 ICE Baseline-E (SAR))
MVA-Parameters:
- RMS of Significant Wave Height (stdswh.01)
7 +2 -2 db sigma0 Backscatter Coefficient
Source: From instr.01 (Cryosat-2 ICE Baseline-E (SAR)) + Envisat sigma nought bias added (3.04 [db])
MVA-Parameters:
- Backscatter Coefficient (sigma0.01)
8 +1 -1 m/s windsp Wind Speed
sigma0 > 30 db, wind set to 0; sigma0 < 3 db, wind set to NaN
Source: Backscatter coefficient from instr.04 converted to wind speed via Envisat wind model
Reference:
Envisat wind model (Saleh, 2007, DOI: 10.1080/01490419.2012.718676)
9 +1 - - iflags Instrument Status and Quality Flags
Source: instr.01 (Cryosat-2 ICE Baseline-E (SAR))
MVA-Parameters:
- Instrument Status and Quality Flags (iflags.01)

Cryosat-2 (SAR, Extended Mission) | SGDR-E | 20Hz

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
Source: instr.01 (Cryosat-2 ICE Baseline-E (SAR))
MVA-Parameters:
- Integer Seconds Elapsed Since Epoch (isec.01)
2 +4 -6 sec msec Microseconds, Fractional Part of isec
Source: instr.01 (Cryosat-2 ICE Baseline-E (SAR))
MVA-Parameters:
- Microseconds, Fractional Part of isec (msec.01)
3 +4 -3 m ralt Altimeter Range
Range from SAMOSA+ (sampy) Retracker
Source: From instr.01 (Cryosat-2 ICE Baseline-E (SAR))
MVA-Parameters:
- Altimeter Range (ralt.01)
4 +2 -3 m stdalt RMS of Altimeter Range
Source: instr.01 (Cryosat-2 ICE Baseline-E (SAR))
MVA-Parameters:
- RMS of Altimeter Range (stdalt.01)
5 2 -2 m swh Significant Wave Height
Significant Wave Height from SAMOSA+ (sampy) Retracker
Source: Significant Wave Height from SAMOSA+ (sampy) Retracker
MVA-Parameters:
- Significant Wave Height (swh.01)
6 +2 -2 m stdswh RMS of Significant Wave Height
Source: instr.01 (Cryosat-2 ICE Baseline-E (SAR))
MVA-Parameters:
- RMS of Significant Wave Height (stdswh.01)
7 +2 -2 db sigma0 Backscatter Coefficient
Source: From instr.01 (Cryosat-2 ICE Baseline-E (SAR)) + Envisat sigma nought bias added (3.04 [db])
MVA-Parameters:
- Backscatter Coefficient (sigma0.01)
8 +1 -1 m/s windsp Wind Speed
sigma0 > 30 db, wind set to 0; sigma0 < 3 db, wind set to NaN
Source: Backscatter coefficient from instr.04 converted to wind speed via Envisat wind model
MVA-Parameters:
- invalid format (.)
- invalid format (.)
- invalid format (1080/01490419.2012)
9 +1 - - iflags Instrument Status and Quality Flags
Source: instr.01 (Cryosat-2 ICE Baseline-E (SAR))
MVA-Parameters:
- Instrument Status and Quality Flags (iflags.01)
Version 05

All Missions

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
Altimeter Range from ALES Retracker
4 +2 -3 m stdalt RMS of Altimeter Range
RMS of Altimeter Range from ALES Retracker
5 2 -2 m swh Significant Wave Height
Significant Wave Height from ALES Retracker
6 +2 -2 m stdswh RMS of Significant Wave Height
7 +2 -2 db sigma0 Backscatter Coefficient
Backscatter Coefficient from ALES Retracker
8 +1 -1 m/s windsp Wind Speed
9 +1 - - iflags Instrument Status and Quality Flags
ALES Retracker
Version 06

All Missions

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
Altimeter Range from ALES+ Retracker
4 +2 -3 m stdalt RMS of Altimeter Range
5 2 -2 m swh Significant Wave Height
Significant Wave Height from ALES+ Retracker
6 +2 -2 m stdswh RMS of Significant Wave Height
7 +2 -2 db sigma0 Backscatter Coefficient
Backscatter Coefficient from ALES+ Retracker
8 +1 -1 m/s windsp Wind Speed
9 +1 - - iflags Instrument Status and Quality Flags
ALES+ Retracker
Version 07

All Missions

Pos Size Scaling Unit Parameter Description
1 +4 - sec isec Integer Seconds Elapsed Since Epoch
2 +4 -6 sec msec Microseconds, Fractional Part of isec
3 +4 -3 m ralt Altimeter Range
Altimeter Range from WHALES Retracker
4 +2 -3 m stdalt RMS of Altimeter Range
5 2 -2 m swh Significant Wave Height
Significant Wave Height from WHALES Retracker
6 +2 -2 m stdswh RMS of Significant Wave Height
7 +2 -2 db sigma0 Backscatter Coefficient
Backscatter Coefficient from WHALES Retracker
8 +1 -1 m/s windsp Wind Speed
9 +1 - - iflags Instrument Status and Quality Flags
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