| Mission | Jason-3 (Extended Mission) |
| MVA-Name | jason3_em_f |
| Source | SGDR-F |
| Frequency | 1 |
agc.00
| Pos | Size | Scaling | Unit | Name | Version Specific Description |
|---|---|---|---|---|---|
| 1 | 2 | -2 | db | agc | Automatic Gain Control
Named agc_ku in GDR-D standard. AGC is corrected for instrumental errors due to the imperfections of the on-board attenuators Source: SGDR-F Original-Parameter: data_01/ku/agc |
| 2 | +2 | -2 | db | agc_rms | RMS of AGC
Named agc_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/agc_rms |
doppler.00
| Pos | Size | Scaling | Unit | Name | Version Specific Description |
|---|---|---|---|---|---|
| 1 | 2 | -3 | m | doppler | Doppler Correction
Named doppler_corr_ku in GDR-D standard 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
Named sea_state_bias_ku in GDR-D standard. 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. This element should not be used over land. See Jason-3 User Handbook 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
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. This element should not be used over land. See Jason-3 User Handbook 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
See Jason-3 User Handbook 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
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 |
instr.01
| Pos | Size | Scaling | Unit | Name | Version Specific Description |
|---|---|---|---|---|---|
| 1 | |||||
| 2 | |||||
| 3 | |||||
| 4 | |||||
| 5 | |||||
| 6 | |||||
| 7 | |||||
| 8 | |||||
| 9 |
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
Named iono_corr_alt_ku in GDR-D standard. 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 |
ionos.01
| Pos | Size | Scaling | Unit | Name | Version Specific Description |
|---|---|---|---|---|---|
| 1 | 2 | -3 | m | ionos | Ionospheric correction
Named iono_corr_gim_ku in GDR-D standard. 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_gim |
ionos.02
| 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 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
Source: SGDR-E Original-Parameter: lon |
| 2 | 4 | -6 | deg | glat | Latitude
Source: SGDR-F Original-Parameter: lat |
| 3 | +4 | -3 | m | hsat | Satellite Altitude
Satellite Altitude above TOPEX Ellipsoid |
| 4 | +1 | - | - | oflags | Orbit Status and Quality Flags |
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 | 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. |