| Mission | ERS-1 (Phase A) |
| MVA-Name | ers1a_hf |
| Source | SGDR/REAPER |
| Frequency | 20 |
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/REAPER Original-Parameter: atmos_corr_sig0 |
doppler.00
| Pos | Size | Scaling | Unit | Name | Version Specific Description |
|---|---|---|---|---|---|
| 1 | 2 | -3 | m | doppler | Doppler Correction
The Doppler correction to range is applied at L1 and included in the onboard tracker value. Source: SGDR/REAPER Original-Parameter: doppler_corr_20hz |
ebias.00
| Pos | Size | Scaling | Unit | Name | Version Specific Description |
|---|---|---|---|---|---|
| 1 | 2 | -3 | m | emb | Sea State Bias
A sea state bias correction must be added (negative value) to the instrument range to correct this range measurement for sea state delays of the radar pulse. See REAPER User Handbook. Source: SGDR/REAPER Original-Parameter: sea_state_bias |
instr.00
| Pos | Size | Scaling | Unit | Name | Version Specific 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 |
instr.01
| Pos | Size | Scaling | Unit | Name | Version Specific 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 |
instr.02
| Pos | Size | Scaling | Unit | Name | Version Specific 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 |
instr.03
| Pos | Size | Scaling | Unit | Name | Version Specific 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 |
invbm.00
| Pos | Size | Scaling | Unit | Name | Version Specific Description |
|---|---|---|---|---|---|
| 1 | 2 | -3 | m | invb | Inverse Barometer Effect
Computed at the altimeter time-tag from the interpolation of 2 meteorological fields that surround the altimeter time-tag. An inverse barometric correction must be added (negative value) to the instrument range to correct this range measurement delays to the radar pulse due to air pressure. This field is a component of hf_fluctuations_corr so do not apply both. See REAPER User Handbook. Source: SGDR/REAPER Original-Parameter: inv_bar_corr |
ionos.00
| Pos | Size | Scaling | Unit | Name | Version Specific Description |
|---|---|---|---|---|---|
| 1 | 2 | -3 | m | ionos | Ionospheric correction
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 REAPER User Handbook. Source: SGDR/REAPER Original-Parameter: iono_corr_gps |
ionos.01
| Pos | Size | Scaling | Unit | Name | Version Specific Description |
|---|---|---|---|---|---|
| 1 | 2 | -3 | m | ionos | Ionospheric correction
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 REAPER User Handbook. Source: SGDR/REAPER Original-Parameter: iono_corr_model |
orbit.00
| Pos | Size | Scaling | Unit | Name | Version Specific Description |
|---|---|---|---|---|---|
| 1 | +4 | -6 | deg | glon | Longitude
East longitude relative to Greenwich meridian. Source: SGDR/REAPER Original-Parameter: lon |
| 2 | 4 | -6 | deg | glat | Latitude
Positive latitude is North latitude, negative latitude is South latitude. Source: SGDR/REAPER Original-Parameter: lat |
| 3 | +4 | -3 | m | hsat | Satellite Altitude
Altitude of satellite above the reference ellipsoid. Source: SGDR/REAPER Original-Parameter: alt |
| 4 | +1 | - | - | oflags | Orbit Status and Quality Flags
Source: SGDR/REAPER Original-Parameter: bathymetry, rad_surf_type Flags: 2 : bathymetry > -2000 4 : bathymetry > -200 8 : rad_surf_type == 1 16 : bathymetry > 0 |
tidee.00
| Pos | Size | Scaling | Unit | Name | Version Specific Description |
|---|---|---|---|---|---|
| 1 | 2 | -3 | m | etide | Solid Earth Tide Correction
The permanent tide (zero frequency) is not included. See REAPER User Handbook. Source: SGDR/REAPER Original-Parameter: solid_earth_tide |
| 2 | 2 | -3 | m | ptide | Pole Tide Correction
See REAPER User Handbook. Source: SGDR/REAPER Original-Parameter: pole_tide |
tracker.00
| Pos | Size | Scaling | Unit | Name | Version Specific Description |
|---|---|---|---|---|---|
| 1 | +1 | - | - | mode | Onboard Tracker Mode
Status for the current record, derived by the L1b processing. Time_Jump is corruption of the SBC sufficient to put the timestamp outside the current file start/stop times. Source: SGDR/REAPER Original-Parameter: alt_state_flag_20hz |
tropd.00
| Pos | Size | Scaling | Unit | Name | Version Specific Description |
|---|---|---|---|---|---|
| 1 | 2 | -3 | m | dtrop | Dry Tropospheric Correction
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 REAPER User Handbook. Source: SGDR/REAPER Original-Parameter: model_dry_tropo_corr |
tropw.00
| Pos | Size | Scaling | Unit | Name | Version Specific Description |
|---|---|---|---|---|---|
| 1 | 2 | -3 | m | wtrop | Wet Tropospheric Correction
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 REAPER User Handbook. Source: SGDR/REAPER Original-Parameter: rad_wet_tropo_corr |
tropw.01
| Pos | Size | Scaling | Unit | Name | Version Specific Description |
|---|---|---|---|---|---|
| 1 | 2 | -3 | m | wtrop | Wet Tropospheric Correction
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 REAPER User Handbook. Source: SGDR/REAPER Original-Parameter: model_wet_tropo_corr |
uralt.00
| Pos | Size | Scaling | Unit | Name | Version Specific Description |
|---|---|---|---|---|---|
| 1 | +4 | -3 | m | uralt | Tracker Range
All instrumental corrections included. Source: SGDR/REAPER Original-Parameter: tracker_range_20hz |
waveform_scaling.00
| Pos | Size | Scaling | Unit | Name | Version Specific Description |
|---|---|---|---|---|---|
| 1 | 2 | -2 | db | scaling_factor_20hz_ku | Scaling factor for Ku band backscatter coefficient
This scaling factor represents the backscatter coefficient for a retracked waveform amplitude equal to 1. Source: SGDR/REAPER Original-Parameter: scaling_factor_20hz |