Recordmaps by Mission

Mission Jason-3
MVA-Name jason3_f
Source SGDR-F
Frequency 1

agc.00

Pos Size Scaling Unit Name Version Specific Description
1 2 -2 db agc Automatic Gain Control
Source: SGDR-F
Original-Parameter: data_01/ku/agc
2 +2 -2 db agc_rms RMS of AGC
Source: SGDR-F
Original-Parameter: data_01/ku/agc_rms

atmos_corr_sig0.00

Pos Size Scaling Unit Name Version Specific Description
1 2 -2 db atmos_corr_sig0_ku Atmospheric Attenuation Correction
Source: SGDR-F
Original-Parameter: data_01/ku/sig0_cor_atm

doppler.00

Pos Size Scaling Unit Name Version Specific Description
1 2 -3 m doppler Doppler Correction
Source: SGDR-F
Original-Parameter: data_01/ku/range_cor_doppler

ebias.00

Pos Size Scaling Unit Name Version Specific Description
1 2 -3 m emb Sea State Bias
Source: SGDR-F
Original-Parameter: data_01/ku/sea_state_bias

ebias.02

Pos Size Scaling Unit Name Version Specific Description
1 2 -3 m emb Sea State Bias
Source: SGDR-F
Original-Parameter: data_01/ku/sea_state_bias_adaptive

icefg.01

Pos Size Scaling Unit Name Version Specific Description
1 +1 - - iceflag Ice Flag
Source: SGDR-F
Original-Parameter: data_01/ice_flag

instr.00

Pos Size Scaling Unit Name Version Specific 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

instr.02

Pos Size Scaling Unit Name Version Specific 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

invbm.01

Pos Size Scaling Unit Name Version Specific Description
1 2 -3 m invb Inverse Barometer Effect
Named inv_bar_corr in GDR-D standard. Computed at the altimeter time-tag from the interpolation of 2 meteorological fields that surround the altimeter time-tag. See Jason-3 User Handbook
Source: SGDR-F
Original-Parameter: data_01/inv_bar_cor

ionos.00

Pos Size Scaling Unit Name Version Specific Description
1 2 -3 m ionos Ionospheric correction
Source: SGDR-F
Original-Parameter: data_01/ku/iono_cor_alt

ionos.01

Pos Size Scaling Unit Name Version Specific Description
1 2 -3 m ionos Ionospheric correction
Source: SGDR_F
Original-Parameter: data_01/ku/iono_cor_gim

ionos.02

Pos Size Scaling Unit Name Version Specific Description
1 2 -3 m ionos Ionospheric correction
Filtered altimeter ionospheric correction on Ku band
An ionospheric correction must be added (negative value) to the instrument range to correct this range measurement for ionospheric range delays of the radar pulse. See Jason-3 User Handbook
Source: SGDR-F
Original-Parameter: data_01/ku/iono_cor_alt_filtered

orbit.00

Pos Size Scaling Unit Name Version Specific Description
1 +4 -6 deg glon Longitude
Named lon in GDR-D standard. East longitude relative to Greenwich meridian. See Jason-3 User Handbook. Associated quality flag is orb_state_diode_flag for the OGDR products, orb_state_rest_flag for the IGDR and GDR products
Source: SGDR-F
Original-Parameter: data_01/longitude
2 4 -6 deg glat Latitude
Named lat in GDR-D standard. Positive latitude is North latitude, negative latitude is South latitude. See Jason-3 User Handbook. Associated quality flag is orb_state_diode_flag for the OGDR products, orb_state_rest_flag for the IGDR and GDR products
Source: SGDR-F
Original-Parameter: data_01/latitude
3 +4 -3 m hsat Satellite Altitude
Satellite Altitude above TOPEX Ellipsoid
Source: SGDR-F
Original-Parameter: data_01/altitude
4 +1 - - oflags Orbit Status and Quality Flags
Source: SGDR-F
Original-Parameter: data_01/depth_or_elevation, data_01/rad_surface_type_flag, data_01/ku/wvf_main_class, data_01/surface_classification_flag, data_01/orb_state_rest_flag, data_01/hsat
Flags:
2 : depth_or_elevation > -2000
4 : depth_or_elevation > -200
8 : rad_surface_type_flag != 0 or wvf_main_class != 0
16 : surface_classification_flag != 0
64 : orb_state_rest_flag == 0
128 : hsat == 2147483647

slafg.40

Pos Size Scaling Unit Name Version Specific Description
1 2 -3 m sla Sea Level Anomalies
Sea Level Anomalies using DTU15, EOT20, DAC, MMXO22
MVA-Parameters:
- Orbit Status and Quality Flags (oflags.00)
- Instrument Status and Quality Flags (iflags.00)
- Satellite Altitude above TOPEX Ellipsoid (hsat.00)
- Altimeter Range (ralt.00)
- Wet Tropospheric Correction from Vienna Mapping Function (VMF3) (wtrop.06)
- Dry Tropospheric Correction from Vienna Mapping Function (VMF3) (dtrop.06)
- Filtered altimeter ionospheric correction on Ku band (ionos.02)
- Solid Earth Tide Correction using IERS Convention 2010 (etide.06)
- Pole Tide Correction (ptide.05)
- Ocean Tide Correction of EOT20 (otide.22)
- Ocean Load Tide Correction of EOT22 (ltide.22)
- Internal Tide Correction (itide.01)
- Sea State Bias (emb.00)
- Inverse Barometer Effect from DAC (AVISO) (invb.05)
- Radial Orbit Error from MMXO22 (oer.22)
- Mean Sea Surface Height from DTU15 (mssh.05)
2 +1 - - gflags Geophysical Corrections Quality Flags
MVA-Parameters:
- Dry Tropospheric Correction from Vienna Mapping Function (VMF3) (dtrop.06)
- Wet Tropospheric Correction from Vienna Mapping Function (VMF3) (wtrop.06)
- Filtered altimeter ionospheric correction on Ku band (ionos.02)
- Sea State Bias (emb.00)
- Radial Orbit Error from MMXO22 (oer.22)
- Fractional Ice Concentration from NSIDC (fic.01)

sshfg.40

Pos Size Scaling Unit Name Version Specific Description
1 4 -3 m ssh Sea Surface Heights
consistent with SLA version 40 and DTU15
MVA-Parameters:
- Sea Level Anomalies using DTU15, EOT20, DAC, MMXO22 (sla.40)
- Land Ocean Flags from GMT (lwmask.01)
- Mean Sea Surface Height from DTU15 (mssh.05)
2 +1 - - sflag Geophysical Corrections Quality Flags
MVA-Parameters:
- Geophysical Corrections Quality Flags (gflags.40)
- Sea Level Anomalies using DTU15, EOT20, DAC, MMXO22 (sla.40)
- Land Ocean Flags from GMT (lwmask.01)

tidee.00

Pos Size Scaling Unit Name Version Specific Description
1 2 -3 m etide Solid Earth Tide Correction
Calculated using Cartwright and Tayler tables and consisting of the second and third degree constituents. The permanent tide (zero frequency) is not included. See Jason-3 User Handbook
Source: SGDR-F
Original-Parameter: data_01/solid_earth_tide
2 2 -3 m ptide Pole Tide Correction
See Jason-3 User Handbook
Source: SGDR-F
Original-Parameter: data_01/pole_tide

tropd.00

Pos Size Scaling Unit Name Version Specific Description
1 2 -3 m dtrop Dry Tropospheric Correction
Named model_dry_tropo_corr in GDR-D standard. Computed at the altimeter time-tag from the interpolation of 2 meteorological fields that surround the altimeter time-tag. A dry tropospheric correction must be added (negative value) to the instrument range to correct this range measurement for dry tropospheric range delays of the radar pulse. See Jason-3 User Handbook
Source: SGDR-F
Original-Parameter: data_01/model_dry_tropo_cor_zero_altitude

tropw.00

Pos Size Scaling Unit Name Version Specific Description
1 2 -3 m wtrop Radiometer wet tropospheric correction
Named rad_wet_tropo_corr in GDR-D standard. A wet tropospheric correction must be added (negative value) to the instrument range to correct this range measurement for wet tropospheric range delays of the radar pulse
Source: SGDR-F
Original-Parameter: data_01/rad_wet_tropo_cor

tropw.01

Pos Size Scaling Unit Name Version Specific Description
1 2 -3 m wtrop Wet Tropospheric Correction
Named model_wet_tropo_corr in GDR-D standard. Computed at the altimeter time-tag from the interpolation of 2 meteorological fields that surround the altimeter time-tag. A wet tropospheric correction must be added (negative value) to the instrument range to correct this range measurement for wet tropospheric range delays of the radar pulse. See Jason-3 User Handbook
Source: SGDR-F
Original-Parameter: data_01/model_wet_tropo_cor_zero_altitude

uralt.00

Pos Size Scaling Unit Name Version Specific Description
1 +4 -3 m uralt Tracker Range
Named tracker_20hz_ku in GDR-D standard. Ku band operating tracker (’Diode+DEM’ or ’Median’ or ’Split-Gate’ tracker). This includes the Distance antenna-COG (/data_01/range_cor_cog), USO drift correction (/data_01/range_cor_uso) and internal path correction (/data_01/ku/range_cor_internal_path). But not the 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/tracker_range_calibrated

wtropc.00

Pos Size Scaling Unit Name Version Specific Description
1 4 -6 m wtropc Correction of Wet Tropospheric Correction
Recent assessments of the global sea level budget have resulted in increased scrutiny of estimates of global sea level change based on HDR Jason-3 (https://www.ncei.noaa.gov/archive/accession/Jason3-xGDR). After a careful assessment of the wet tropospheric correction derived from the Advanced Microwave Radiometer (AMR) instrument, it was determined that further improvements to the accuracy of the historical Jason-3 observations could be made. Since this assessment was only completed after Jason-3 data was reprocessed to GDR-F (Geophysical Data Record Version F) standards, it was not included in the GDR-F product release. For this reason, a supplementary correction product has been created using the method of Brown et al. (2012) that will allow users to correct path delay and sea surface height observations, reducing errors in estimates of global sea level change by 2-3 mm over 8 years. The correction should be applied in an ADDITIVE sense to RANGE, or it can be SUBTRACTED from SEA SURFACE HEIGHT ANOMALY in order to apply the correction. When corrected properly, the result should be to REDUCE the amount of global sea level rise observed by the Jason-3 mission by about 2 mm between 2016 and 2023. Documentation for the correction can be found here: https://podaac.jpl.nasa.gov/dataset/JASON_3_PD_CORRECTION/
Reference: Brown, S. (2012). Maintaining the long-term calibration of the Jason-2/OSTM advanced microwave radiometer through intersatellite calibration. IEEE transactions on geoscience and remote sensing, 51(3), 1531-1543.

Find more topics on the central web site of the Technical University of Munich: www.tum.de