SWOT Level 2 Nadir Altimeter Interim Geophysical Data Record with Waveforms - SGDR Version D
(SWOT_L2_NALT_IGDR_SGDR_D)| Version | D |
| Processing Level | 2 |
| Start/Stop Date | 2022-Dec-16 to Present |
| Short Name | SWOT_L2_NALT_IGDR_SGDR_D |
| Description | Same as L2_NALT_GDR, using preliminary values for some auxiliary data. Uses Medium-accuracy (preliminary) Orbit Ephemeris (MOE). Available with latency of < 1.5 days. Discrete measurements at nadir for each half orbit, along the ground track. Available in netCDF-4 file format.
This collection is a sub-collection of its parent: https://podaac.jpl.nasa.gov/dataset/SWOT_L2_NALT_IGDR_D |
| DOI | 10.5067/SWOT-NALT-IGDR-D |
| Measurement | OCEANS > SEA SURFACE TOPOGRAPHY > SEA SURFACE HEIGHT OCEANS > OCEAN WAVES > SIGNIFICANT WAVE HEIGHT |
| Platform/Sensor | SWOT / Platform Name: Surface Water Ocean Topography (SWOT) Jason-class Altimeter SENSOR Name: Jason-class Altimeter (Jason-class Altimeter) SWOT / Platform Name: Surface Water Ocean Topography (SWOT) AMR SENSOR Name: Advanced Microwave Radiometer (AMR) Swath Width: 18.7 ghz Description: The operating frequency which is aimed towards recovery of atmospheric attenuation due to sigma0 Swath Width: 23.8 ghz Description: The operating frequency which is aimed towards recovery of atmospheric attenuation due to water vapor Swath Width: 34.0 ghz Description: The operating frequency which is aimed towards recovery of atmospheric attenuation due to cloud liquid water. |
| Project | Surface Water Ocean Topography (SWOT) |
| Data Provider | Publisher: NASA/JPL/PODAAC Creator: Surface Water Ocean Topography (SWOT) Release Date: 2025-May-06 |
| Format | netCDF-4 |
| Keyword(s) | sea level, SWOT, Surface Water Ocean Topography, sea level anomaly, sla, sea surface height, ssh, sea surface height anomaly, ssha, significant wave height, swh, wave height, along-track, nadir, altimeter Jason-class, Poseidon-3C |
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
Coverage Region: GLOBAL North Bounding Coordinate: 77.6 degrees South Bounding Coordinate: -77.6 degrees West Bounding Coordinate: -180 degrees East Bounding Coordinate: 180 degrees Time Span: 2022-Dec-16 to Present |
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| us-west-2 | |
| podaac-swot-ops-cumulus-protected/SWOT_L2_NALT_IGDR_D/ | |
| podaac-swot-ops-cumulus-public/SWOT_L2_NALT_IGDR_D/ | |
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| TOOLS AND SERVICES | |
| Data Subscriber | |
| Name | Long Name | Unit |
|---|---|---|
| /data_01/alt_state_band_seq_flag | altimeter state flag: Ku/C band sequencing | |
| /data_01/altitude | 1 Hz altitude of satellite | m |
| /data_01/altitude_rate | 1 Hz orbital altitude rate | m/s |
| /data_01/angle_of_approach_to_coast | angle of approach to the coast | degrees |
| /data_01/c/agc | C band corrected AGC | dB |
| /data_01/c/agc_numval | number of valid points used to compute C band AGC | count |
| /data_01/c/agc_rms | RMS of the C band AGC | dB |
| /data_01/c/alt_state_band_status_flag | altimeter state flag: C band status | |
| /data_01/c/alt_state_c_band_flag | altimeter state flag: C bandwidth used | |
| /data_01/c/range_cor_doppler | C band Doppler correction on altimeter range | m |
| /data_01/c/range_cor_internal_path | C band internal path delay correction on altimeter range | m |
| /data_01/c/range_cor_ocean_model_instr | C band modeled instrumental correction on altimeter range | m |
| /data_01/c/range_cor_ocean_net_instr | net instrumental correction on the C band range | m |
| /data_01/c/range_cor_ocean_net_instr_qual | quality flag for 1 Hz instrumental correction: C band range | |
| /data_01/c/range_ocean | 1 Hz C band corrected altimeter range | m |
| /data_01/c/range_ocean_compression_qual | quality flag for 1 Hz altimeter data: C band range | |
| /data_01/c/range_ocean_numval | number of valid points for C band range | count |
| /data_01/c/range_ocean_rms | RMS of the C band range | m |
| /data_01/c/sea_state_bias | sea state bias correction in C band | m |
| /data_01/c/sea_state_bias_adaptive | sea state bias correction in C band (adaptive retracking) | m |
| /data_01/c/sea_state_bias_mle3 | sea state bias correction in C band (MLE3 retracking) | m |
| /data_01/c/sig0_cor_atm | atmospheric attenuation correction on C band backscatter coefficient | dB |
| /data_01/c/sig0_cor_calibration | C band internal calibration correction on backscatter coefficient | dB |
| /data_01/c/sig0_cor_ocean_model_instr | C band modeled instrumental on backscatter coefficient | dB |
| /data_01/c/sig0_cor_ocean_net_instr | net instrumental correction on C band backscatter coefficient | dB |
| /data_01/c/sig0_cor_ocean_net_instr_qual | quality flag for 1 Hz instrumental correction: C band backscatter coefficient | |
| /data_01/c/sig0_ocean | C band corrected backscatter coefficient | dB |
| /data_01/c/sig0_ocean_compression_qual | quality flag for 1 Hz altimeter data: C band backscatter coefficient | |
| /data_01/c/sig0_ocean_numval | number of valid points used to compute C band backscatter coefficient | count |
| /data_01/c/sig0_ocean_rms | RMS of the C band backscatter coefficient | dB |
| /data_01/c/swh_cor_ocean_model_instr | C band modeled instrumental correction on significant waveheight | m |
| /data_01/c/swh_cor_ocean_net_instr | net instrumental correction on C band significant waveheight | m |
| /data_01/c/swh_cor_ocean_net_instr_qual | quality flag for 1 Hz instrumental correction: C band SWH | |
| /data_01/c/swh_ocean | C band corrected significant waveheight | m |
| /data_01/c/swh_ocean_compression_qual | quality flag for 1 Hz altimeter data: C band SWH | |
| /data_01/c/swh_ocean_numval | number of valid points used to compute C band significant waveheight | count |
| /data_01/c/swh_ocean_rms | RMS of the C band significant waveheight | m |
| /data_01/dac | dynamic atmospheric correction | m |
| /data_01/depth_or_elevation | ocean depth/land elevation | m |
| /data_01/distance_to_coast | distance to the coast | m |
| /data_01/geoid | geoid height | m |
| /data_01/ice_flag | ice flag | |
| /data_01/index_first_20hz_measurement | record counter of the first associated 20 Hz measurement | |
| /data_01/internal_tide_hret | internal tide height | m |
| /data_01/internal_tide_hret_interp_qual | internal tide interpolation flag | |
| /data_01/inv_bar_cor | inverted barometer height correction | m |
| /data_01/ku/agc | Ku band corrected AGC | dB |
| /data_01/ku/agc_numval | number of valid points used to compute Ku band AGC | count |
| /data_01/ku/agc_rms | RMS of the Ku band AGC | dB |
| /data_01/ku/alt_state_band_status_flag | altimeter state flag: Ku band status | |
| /data_01/ku/iono_cor_alt | altimeter ionospheric correction on Ku band | m |
| /data_01/ku/iono_cor_alt_adaptive | altimeter ionospheric correction on Ku band (adaptive retracking) | m |
| /data_01/ku/iono_cor_alt_filtered | filtered altimeter ionospheric correction on Ku band | m |
| /data_01/ku/iono_cor_alt_filtered_adaptive | filtered altimeter ionospheric correction on Ku band (adaptive retracking) | m |
| /data_01/ku/iono_cor_alt_filtered_adaptive_qual | filtered altimeter ionospheric correction quality flag (adaptive retracking) | |
| /data_01/ku/iono_cor_alt_filtered_mle3 | filtered altimeter ionospheric correction on Ku band (MLE3 retracking) | m |
| /data_01/ku/iono_cor_alt_filtered_mle3_qual | filtered altimeter ionospheric correction quality flag (MLE3 retracking) | |
| /data_01/ku/iono_cor_alt_filtered_qual | filtered altimeter ionospheric correction quality flag | |
| /data_01/ku/iono_cor_alt_mle3 | altimeter ionospheric correction on Ku band (MLE3 retracking) | m |
| /data_01/ku/iono_cor_gim | GIM ionospheric correction on Ku band | m |
| /data_01/ku/off_nadir_angle_wf_ocean | square of the off nadir angle computed from Ku band waveforms | degrees^2 |
| /data_01/ku/off_nadir_angle_wf_ocean_compression_qual | quality flag for 1 Hz altimeter data: off nadir angle from Ku band | |
| /data_01/ku/off_nadir_angle_wf_ocean_numval | number of valid points for square of the off nadir angle computed from Ku band waveforms | count |
| /data_01/ku/off_nadir_angle_wf_ocean_rms | RMS of the square of the off nadir angle computed from Ku band waveforms | degrees^2 |
| /data_01/ku/range_adaptive | 1 Hz Ku band corrected altimeter range (adaptive retracking) | m |
| /data_01/ku/range_adaptive_compression_qual | quality flag for 1 Hz altimeter data: Ku band range (adaptive retracking) | |
| /data_01/ku/range_adaptive_numval | number of valid points for Ku band range (adaptive retracking) | count |
| /data_01/ku/range_adaptive_rms | RMS of the Ku band range (adaptive retracking) | m |
| /data_01/ku/range_cor_adaptive_net_instr | net instrumental correction on the Ku band range (adaptive retracking) | m |
| /data_01/ku/range_cor_doppler | Ku band Doppler correction on altimeter range | m |
| /data_01/ku/range_cor_internal_path | Ku band internal path delay correction on altimeter range | m |
| /data_01/ku/range_cor_ocean_mle3_model_instr | Ku band modeled instrumental correction on altimeter range (MLE3 retracking) | m |
| /data_01/ku/range_cor_ocean_mle3_net_instr | net instrumental correction on the Ku band range (MLE3 retracking) | m |
| /data_01/ku/range_cor_ocean_model_instr | Ku band modeled instrumental correction on altimeter range | m |
| /data_01/ku/range_cor_ocean_net_instr | net instrumental correction on the Ku band range | m |
| /data_01/ku/range_cor_ocean_net_instr_qual | quality flag for 1 Hz instrumental correction: Ku band range | |
| /data_01/ku/range_ocean | 1 Hz Ku band corrected altimeter range | m |
| /data_01/ku/range_ocean_compression_qual | quality flag for 1 Hz altimeter data: Ku band range | |
| /data_01/ku/range_ocean_mle3 | 1 Hz Ku band corrected altimeter range (MLE3 retracking) | m |
| /data_01/ku/range_ocean_mle3_compression_qual | quality flag for 1 Hz altimeter data: Ku band range (MLE3 retracking) | |
| /data_01/ku/range_ocean_mle3_numval | number of valid points for Ku band range (MLE3 retracking) | count |
| /data_01/ku/range_ocean_mle3_rms | RMS of the Ku band range (MLE3 retracking) | m |
| /data_01/ku/range_ocean_numval | number of valid points for Ku band range | count |
| /data_01/ku/range_ocean_rms | RMS of the Ku band range | m |
| /data_01/ku/sea_state_bias | sea state bias correction in Ku band | m |
| /data_01/ku/sea_state_bias_3d_mp2 | sea state bias correction in Ku band computed from 3d model | m |
| /data_01/ku/sea_state_bias_adaptive | sea state bias correction in Ku band (adaptive retracking) | m |
| /data_01/ku/sea_state_bias_adaptive_3d_mp2 | sea state bias correction in Ku band computed from 3d model | m |
| /data_01/ku/sea_state_bias_mle3 | sea state bias correction in Ku band (MLE3 retracking) | m |
| /data_01/ku/sig0_adaptive | Ku band corrected backscatter coefficient (adaptive retracking) | dB |
| /data_01/ku/sig0_adaptive_compression_qual | quality flag for 1 Hz altimeter data: Ku band backscatter coefficient (adaptive retracking) | |
| /data_01/ku/sig0_adaptive_numval | number of valid points used to compute Ku band backscatter coefficient (adaptive retracking) | count |
| /data_01/ku/sig0_adaptive_rms | RMS of the Ku band backscatter coefficient (adaptive retracking) | dB |
| /data_01/ku/sig0_cor_adaptive_net_instr | net instrumental correction on Ku band backscatter coefficient (adaptive retracking) | dB |
| /data_01/ku/sig0_cor_atm | atmospheric attenuation correction on Ku band backscatter coefficient | dB |
| /data_01/ku/sig0_cor_calibration | Ku band internal calibration correction on backscatter coefficient | dB |
| /data_01/ku/sig0_cor_ocean_mle3_model_instr | Ku band modeled instrumental correction on backscatter coefficient (MLE3 retracking) | dB |
| /data_01/ku/sig0_cor_ocean_mle3_net_instr | net instrumental correction on Ku band backscatter coefficient (MLE3 retracking) | dB |
| /data_01/ku/sig0_cor_ocean_model_instr | Ku band modeled instrumental correction on backscatter coefficient | dB |
| /data_01/ku/sig0_cor_ocean_net_instr | net instrumental correction on Ku band backscatter coefficient | dB |
| /data_01/ku/sig0_cor_ocean_net_instr_qual | quality flag for 1 Hz instrumental correction: Ku band backscatter coefficient | |
| /data_01/ku/sig0_ocean | Ku band corrected backscatter coefficient | dB |
| /data_01/ku/sig0_ocean_compression_qual | quality flag for 1 Hz altimeter data: Ku band backscatter coefficient | |
| /data_01/ku/sig0_ocean_mle3 | Ku band corrected backscatter coefficient (MLE3 retracking) | dB |
| /data_01/ku/sig0_ocean_mle3_compression_qual | quality flag for 1 Hz altimeter data: Ku band backscatter coefficient (MLE3 retracking) | |
| /data_01/ku/sig0_ocean_mle3_numval | number of valid points used to compute Ku band backscatter coefficient (MLE3 retracking) | count |
| /data_01/ku/sig0_ocean_mle3_rms | RMS of the Ku band backscatter coefficient (MLE3 retracking) | dB |
| /data_01/ku/sig0_ocean_numval | number of valid points used to compute Ku band backscatter coefficient | count |
| /data_01/ku/sig0_ocean_rms | RMS of the Ku band backscatter coefficient | dB |
| /data_01/ku/ssha | sea surface height anomaly | m |
| /data_01/ku/ssha_mle3 | sea surface height anomaly (MLE3 retracking) | m |
| /data_01/ku/swh_adaptive | Ku band corrected significant waveheight (adaptive retracking) | m |
| /data_01/ku/swh_adaptive_compression_qual | quality flag for 1 Hz altimeter data: Ku band SWH (adaptive retracking) | |
| /data_01/ku/swh_adaptive_numval | number of valid points used to compute Ku band significant waveheight (adaptive retracking) | count |
| /data_01/ku/swh_adaptive_rms | RMS of the Ku band significant waveheight (adaptive retracking) | m |
| /data_01/ku/swh_cor_adaptive_net_instr | net instrumental correction on Ku band significant waveheight (adaptive retracking) | m |
| /data_01/ku/swh_cor_ocean_mle3_model_instr | Ku band modeled instrumental correction on significant waveheight (MLE3 retracking) | m |
| /data_01/ku/swh_cor_ocean_mle3_net_instr | net instrumental correction on Ku band significant waveheight (MLE3 retracking) | m |
| /data_01/ku/swh_cor_ocean_model_instr | Ku band modeled instrumental correction on significant waveheight | m |
| /data_01/ku/swh_cor_ocean_net_instr | net instrumental correction on Ku band significant waveheight | m |
| /data_01/ku/swh_cor_ocean_net_instr_qual | quality flag for 1 Hz instrumental correction: Ku band SWH | |
| /data_01/ku/swh_ocean | Ku band corrected significant waveheight | m |
| /data_01/ku/swh_ocean_compression_qual | quality flag for 1 Hz altimeter data: Ku band SWH | |
| /data_01/ku/swh_ocean_mle3 | Ku band corrected significant waveheight (MLE3 retracking) | m |
| /data_01/ku/swh_ocean_mle3_compression_qual | quality flag for 1 Hz altimeter data: Ku band SWH (MLE3 retracking) | |
| /data_01/ku/swh_ocean_mle3_numval | number of valid points used to compute Ku band significant waveheight (MLE3 retracking) | count |
| /data_01/ku/swh_ocean_mle3_rms | RMS of the Ku band significant waveheight (MLE3 retracking) | m |
| /data_01/ku/swh_ocean_numval | number of valid points used to compute Ku band significant waveheight | count |
| /data_01/ku/swh_ocean_rms | RMS of the Ku band significant waveheight | m |
| /data_01/ku/wvf_main_class | 1 Hz Ku band waveform main class | |
| /data_01/latitude | latitude | degrees_north |
| /data_01/load_tide_fes | load tide height for geocentric ocean tide (FES solution) | m |
| /data_01/load_tide_got | load tide height for geocentric ocean tide (GOT solution) | m |
| /data_01/longitude | longitude | degrees_east |
| /data_01/mean_dynamic_topography | mean dynamic topography above geoid | m |
| /data_01/mean_dynamic_topography_interp_qual | MDT interpolation flag | |
| /data_01/mean_sea_surface_cnescls | mean sea surface height (CNES/CLS solution) above reference ellipsoid | m |
| /data_01/mean_sea_surface_cnescls_interp_qual | mean sea surface interpolation flag (CNES/CLS solution) | |
| /data_01/mean_sea_surface_dtu | mean sea surface height (DTU solution) above reference ellipsoid | m |
| /data_01/mean_sea_surface_dtu_interp_qual | mean sea surface interpolation flag (DTU solution) | |
| /data_01/mean_wave_direction | mean direction of the sea surface wave | degrees |
| /data_01/mean_wave_period_t02 | t02 mean wave period | s |
| /data_01/meteo_map_availability_flag | ECMWF meteorological map availability | |
| /data_01/meteo_measurement_altitude_interp_qual | meteorological data at measurement altitude interpolation flag | |
| /data_01/meteo_zero_altitude_interp_qual | meteorological data at zero altitude interpolation flag | |
| /data_01/model_dry_tropo_cor_measurement_altitude | model dry tropospheric correction at measurement altitude | m |
| /data_01/model_dry_tropo_cor_zero_altitude | model dry tropospheric correction at zero altitude | m |
| /data_01/model_wet_tropo_cor_measurement_altitude | model wet tropospheric correction at measurement altitude | m |
| /data_01/model_wet_tropo_cor_zero_altitude | model wet tropospheric correction at zero altitude | m |
| /data_01/numtotal_20hz_measurement | total number of 20 Hz measurements associated to the 1 Hz measurement | |
| /data_01/ocean_tide_eq | equilibrium long-period ocean tide height | m |
| /data_01/ocean_tide_fes | geocentric ocean tide height (FES solution) | m |
| /data_01/ocean_tide_fes_interp_qual | ocean tide interpolation flag (FES solution) | |
| /data_01/ocean_tide_got | geocentric ocean tide height (GOT solution) | m |
| /data_01/ocean_tide_got_interp_qual | ocean tide interpolation flag (GOT solution) | |
| /data_01/ocean_tide_non_eq | non-equilibrium long-period ocean tide height | m |
| /data_01/orb_state_diode_flag | orbit state flag: OGDR products | |
| /data_01/orb_state_rest_flag | orbit state flag: restituted orbit | |
| /data_01/pole_tide | geocentric pole tide height | m |
| /data_01/rad_cloud_liquid_water | radiometer liquid water content | kg/m^2 |
| /data_01/rad_side_1_distance_to_land | radiometer radial distance to land from first radiometer | m |
| /data_01/rad_side_1_land_frac_187 | radiometer 18.7 GHz antenna gain weighted land fraction in main beam from first radiometer | 1 |
| /data_01/rad_side_1_land_frac_238 | radiometer 23.8 GHz antenna gain weighted land fraction in main beam from first radiometer | 1 |
| /data_01/rad_side_1_land_frac_340 | radiometer 34 GHz antenna gain weighted land fraction in main beam from first radiometer | 1 |
| /data_01/rad_side_1_rain_flag | radiometer rain flag from first radiometer | |
| /data_01/rad_side_1_sea_ice_flag | radiometer sea-ice flag from first radiometer | |
| /data_01/rad_side_1_surface_type_flag | radiometer surface type from first radiometer | |
| /data_01/rad_side_2_distance_to_land | radiometer radial distance to land from second radiometer | m |
| /data_01/rad_side_2_land_frac_187 | radiometer 18.7 GHz antenna gain weighted land fraction in main beam from second radiometer | 1 |
| /data_01/rad_side_2_land_frac_238 | radiometer 23.8 GHz antenna gain weighted land fraction in main beam from second radiometer | 1 |
| /data_01/rad_side_2_land_frac_340 | radiometer 34 GHz antenna gain weighted land fraction in main beam from second radiometer | 1 |
| /data_01/rad_side_2_rain_flag | radiometer rain flag from second radiometer | |
| /data_01/rad_side_2_sea_ice_flag | radiometer sea-ice flag from second radiometer | |
| /data_01/rad_side_2_surface_type_flag | radiometer surface type from second radiometer | |
| /data_01/rad_ta_187 | 18.7 GHz antenna temperature | K |
| /data_01/rad_ta_238 | 23.8 GHz antenna temperature | K |
| /data_01/rad_ta_340 | 34 GHz antenna temperature | K |
| /data_01/rad_tb_187 | 18.7 GHz main beam smoothed brightness temperature | K |
| /data_01/rad_tb_187_qual | quality flag for 1 Hz radiometer data: 18.7 GHz brightness temperature | |
| /data_01/rad_tb_238 | 23.8 GHz main beam smoothed brightness temperature | K |
| /data_01/rad_tb_238_qual | quality flag for 1 Hz radiometer data: 23.8 GHz brightness temperature | |
| /data_01/rad_tb_340 | 34 GHz main beam smoothed brightness temperature | K |
| /data_01/rad_tb_340_qual | quality flag for 1 Hz radiometer data: 34 GHz brightness temperature | |
| /data_01/rad_tmb_187 | 18.7 GHz main beam brightness temperature | K |
| /data_01/rad_tmb_238 | 23.8 GHz main beam brightness temperature | K |
| /data_01/rad_tmb_340 | 34 GHz main beam brightness temperature | K |
| /data_01/rad_water_vapor | radiometer water vapor content | kg/m^2 |
| /data_01/rad_wet_tropo_cor | radiometer wet tropospheric correction | m |
| /data_01/rad_wet_tropo_cor_interp_qual | radiometer wet tropospheric correction interpolation quality flag | |
| /data_01/rad_wind_speed | radiometer wind speed | m/s |
| /data_01/rain_flag | rain flag | |
| /data_01/rain_rate | model rain rate | mm/h |
| /data_01/range_cor_cog | Distance antenna-COG correction on altimeter range | m |
| /data_01/range_cor_uso | USO frequency correction on altimeter range | m |
| /data_01/sea_ice_concentration | sea ice concentration | 1 |
| /data_01/sea_ice_concentration_interp_qual | sea ice concentration data interpolation flag | |
| /data_01/sig0_cor_atm_source | data source for atmospheric attenuation computation | |
| /data_01/solid_earth_tide | solid earth tide height | m |
| /data_01/sst | sea surface temperature | K |
| /data_01/surface_classification_flag | surface classification | |
| /data_01/surface_slope_cor | surface slope correction | m |
| /data_01/time | time in UTC | seconds since 2000-01-01 00:00:00.0 |
| /data_01/time_tai | time in TAI | seconds since 2000-01-01 00:00:00.0 |
| /data_01/wave_model_interp_qual | wave model data interpolation flag | |
| /data_01/wave_model_map_availability_flag | wave model map availability | |
| /data_01/wind_speed_alt | altimeter wind speed | m/s |
| /data_01/wind_speed_alt_adaptive | altimeter wind speed (adaptive retracking) | m/s |
| /data_01/wind_speed_alt_mle3 | altimeter wind speed (MLE3 retracking) | m/s |
| /data_01/wind_speed_mod_u | U component of the model wind vector | m/s |
| /data_01/wind_speed_mod_v | V component of the model wind vector | m/s |
| /data_20/alt_state_acq_mode_flag | 20 Hz altimeter state flag: operational acquisition mode | |
| /data_20/alt_state_track_trans_flag | 20 Hz altimeter state flag: tracking automatic transition | |
| /data_20/altitude | 20 Hz altitude of satellite | m |
| /data_20/angle_of_approach_to_coast | 20 Hz angle of approach to the coast | degrees |
| /data_20/c/agc | 20 Hz C band corrected AGC | dB |
| /data_20/c/agc_cor | 20 Hz C band AGC correction | dB |
| /data_20/c/amplitude_ice2 | C band amplitude (ice-2 retracking) [FFT power unit] | count |
| /data_20/c/amplitude_ocean | C band amplitude (ocean retracking) [FFT power unit] | count |
| /data_20/c/amplitude_ocog | C band amplitude (OCOG retracking) [FFT power unit] | count |
| /data_20/c/epoch_ice2 | C band epoch (ice-2 retracking) | s |
| /data_20/c/epoch_ocean | C band epoch (ocean retracking) | s |
| /data_20/c/epoch_ocog | C band epoch (OCOG retracking) | s |
| /data_20/c/ice2_qual | 20 Hz C band ice-2 retracking quality flag | |
| /data_20/c/mean_amplitude_ice2 | C band mean amplitude (ice-2 retracking) [FFT power unit] | count |
| /data_20/c/mqe_ice2 | 20 Hz C band MQE (ice-2 retracking) | 1 |
| /data_20/c/mqe_ocean | 20 Hz C band MQE (ocean retracking) | 1 |
| /data_20/c/noise_floor_ice2 | C band thermal noise (ice-2 retracking) [FFT power unit] | count |
| /data_20/c/noise_floor_ocean | C band thermal noise (ocean retracking) [FFT power unit] | count |
| /data_20/c/num_iterations_ocean | 20 Hz number of iterations of the ocean retracking in C band | count |
| /data_20/c/peakiness | 20 Hz peakiness on C band waveforms | 1 |
| /data_20/c/power_waveform | C band waveform samples | count |
| /data_20/c/range_ice2 | 20 Hz C band altimeter range (ice-2 retracking) | m |
| /data_20/c/range_ocean | 20 Hz C band corrected altimeter range | m |
| /data_20/c/range_ocean_compression_qual | 20 Hz flag for utilization in the computation of 1 Hz C band range | |
| /data_20/c/range_ocog | 20 Hz C band altimeter range (OCOG retracking) | m |
| /data_20/c/sig0_ice2 | 20 Hz C band backscatter coefficient (ice-2 retracking) | dB |
| /data_20/c/sig0_leading_edge_ice2 | 20 Hz C band leading edge backscatter coefficient (ice-2 retracking) | dB |
| /data_20/c/sig0_ocean | 20 Hz C band corrected backscatter coefficient | dB |
| /data_20/c/sig0_ocean_compression_qual | 20 Hz flag for utilization in the computation of 1 Hz C band backscatter coefficient | |
| /data_20/c/sig0_ocog | 20 Hz C band backscatter coefficient (OCOG retracking) | dB |
| /data_20/c/sig0_scaling_factor | Scaling factor for C band backscatter coefficient | dB |
| /data_20/c/sigmac_ocean | C band width of the leading edge (ocean retracking) | s |
| /data_20/c/sigmal_ice2 | 20 Hz width of the C band leading edge (ice-2 retracking) | m |
| /data_20/c/slope1_ice2 | 20 Hz slope of the first part of the logarithm of the C band trailing edge (ice-2 retracking) | s-1 |
| /data_20/c/slope2_ice2 | 20 Hz slope of the second part of the logarithm of the C band trailing edge (ice-2 retracking) | s-1 |
| /data_20/c/swh_ocean | 20 Hz C band corrected significant waveheight | m |
| /data_20/c/swh_ocean_compression_qual | 20 Hz flag for utilization in the computation of 1 Hz C band significant waveheight | |
| /data_20/c/tracker_range_calibrated | 20 Hz C band corrected tracker range | m |
| /data_20/distance_to_coast | 20 Hz distance to the coast | m |
| /data_20/index_1hz_measurement | record counter of the associated 1 Hz measurement | |
| /data_20/ku/agc | 20 Hz Ku band corrected AGC | dB |
| /data_20/ku/agc_cor | 20 Hz Ku band AGC correction | dB |
| /data_20/ku/amplitude_adaptive | Ku band amplitude (adaptive retracking) [FFT power unit] | count |
| /data_20/ku/amplitude_ice2 | Ku band amplitude (ice-2 retracking) [FFT power unit] | count |
| /data_20/ku/amplitude_ocean | Ku band amplitude (ocean retracking) [FFT power unit] | count |
| /data_20/ku/amplitude_ocean_mle3 | Ku band amplitude (MLE3 retracking) [FFT power unit] | count |
| /data_20/ku/amplitude_ocog | Ku band amplitude (OCOG retracking) [FFT power unit] | count |
| /data_20/ku/amplitude_seaice | Ku band amplitude (sea-ice retracking) [FFT power unit] | count |
| /data_20/ku/amplitude_tfmra | Ku band amplitude (TFMRA retracking) [FFT power unit] | count |
| /data_20/ku/convergence_criteria_adaptive | Ku band convergence criteria (adaptive retracking) | count |
| /data_20/ku/epoch_adaptive | Ku band epoch (adaptive retracking) | s |
| /data_20/ku/epoch_ice2 | Ku band epoch (ice-2 retracking) | s |
| /data_20/ku/epoch_ocean | Ku band epoch (ocean retracking) | s |
| /data_20/ku/epoch_ocean_mle3 | Ku band epoch (MLE3 retracking) | s |
| /data_20/ku/epoch_ocog | Ku band epoch (OCOG retracking) | s |
| /data_20/ku/epoch_seaice | Ku band epoch (sea-ice retracking) | s |
| /data_20/ku/epoch_tfmra | Ku band epoch (TFMRA retracking) | s |
| /data_20/ku/gamma_adaptive | Ku band gamma (adaptive retracking) | count |
| /data_20/ku/ice2_qual | 20 Hz Ku band ice-2 retracking quality flag | |
| /data_20/ku/mean_amplitude_ice2 | Ku band mean amplitude (ice-2 retracking) [FFT power unit] | count |
| /data_20/ku/mqe_adaptive | 20 Hz Ku band MQE (adaptive retracking) | 1 |
| /data_20/ku/mqe_ice2 | 20 Hz Ku band MQE (ice-2 retracking) | 1 |
| /data_20/ku/mqe_ocean | 20 Hz Ku band MQE (ocean retracking) | 1 |
| /data_20/ku/mqe_ocean_mle3 | 20 Hz Ku band MQE (MLE3 retracking) | 1 |
| /data_20/ku/noise_floor_adaptive | Ku band thermal noise (adaptive retracking) [FFT power unit] | count |
| /data_20/ku/noise_floor_ice2 | Ku band thermal noise (ice-2 retracking) [FFT power unit] | count |
| /data_20/ku/noise_floor_ocean | Ku band thermal noise (ocean retracking) [FFT power unit] | count |
| /data_20/ku/num_iterations_adaptive | 20 Hz number of iterations of the adaptive retracking in Ku band | count |
| /data_20/ku/num_iterations_ocean | 20 Hz number of iterations of the ocean retracking in Ku band | count |
| /data_20/ku/num_iterations_ocean_mle3 | 20 Hz number of iterations of the ocean retracking in Ku band (MLE3 retracking) | count |
| /data_20/ku/ocog_qual | 20 Hz Ku band OCOG retracking quality flag | |
| /data_20/ku/off_nadir_angle_wf_ocean | 20 Hz square of the off nadir angle computed from Ku band waveforms | degrees^2 |
| /data_20/ku/off_nadir_angle_wf_ocean_compression_qual | 20 Hz flag for utilization in the computation of 1 Hz square of the off nadir angle computed from Ku band waveforms | |
| /data_20/ku/peakiness | 20 Hz peakiness on Ku band waveforms | 1 |
| /data_20/ku/power_waveform | Ku band waveform samples | count |
| /data_20/ku/range_adaptive | 20 Hz Ku band corrected altimeter range (adaptive retracking) | m |
| /data_20/ku/range_adaptive_compression_qual | 20 Hz flag for utilization in the computation of 1 Hz Ku band range (adaptive retracking) | |
| /data_20/ku/range_ice2 | 20 Hz Ku band altimeter range (ice-2 retracking) | m |
| /data_20/ku/range_ocean | 20 Hz Ku band corrected altimeter range | m |
| /data_20/ku/range_ocean_compression_qual | 20 Hz flag for utilization in the computation of 1 Hz Ku band range | |
| /data_20/ku/range_ocean_mle3 | 20 Hz Ku band corrected altimeter range (MLE3 retracking) | m |
| /data_20/ku/range_ocean_mle3_compression_qual | 20 Hz flag for utilization in the computation of 1 Hz Ku band range (MLE3 retracking) | |
| /data_20/ku/range_ocog | 20 Hz Ku band altimeter range (OCOG retracking) | m |
| /data_20/ku/range_seaice | 20 Hz Ku band altimeter range (sea-ice retracking) | m |
| /data_20/ku/range_tfmra | 20 Hz Ku band altimeter range (TFMRA retracking) | m |
| /data_20/ku/seaice_qual | 20 Hz Ku band sea-ice retracking quality flag | |
| /data_20/ku/sig0_adaptive | 20 Hz Ku band corrected backscatter coefficient (adaptive retracking) | dB |
| /data_20/ku/sig0_adaptive_compression_qual | 20 Hz flag for utilization in the computation of 1 Hz Ku band backscatter coefficient (adaptive retracking) | |
| /data_20/ku/sig0_ice2 | 20 Hz Ku band backscatter coefficient (ice-2 retracking) | dB |
| /data_20/ku/sig0_leading_edge_ice2 | 20 Hz Ku band leading edge backscatter coefficient (ice-2 retracking) | dB |
| /data_20/ku/sig0_ocean | 20 Hz Ku band corrected backscatter coefficient | dB |
| /data_20/ku/sig0_ocean_compression_qual | 20 Hz flag for utilization in the computation of 1 Hz Ku band backscatter coefficient | |
| /data_20/ku/sig0_ocean_mle3 | 20 Hz Ku band corrected backscatter coefficient (MLE3 retracking) | dB |
| /data_20/ku/sig0_ocean_mle3_compression_qual | 20 Hz flag for utilization in the computation of 1 Hz Ku band backscatter coefficient (MLE3 retracking) | |
| /data_20/ku/sig0_ocog | 20 Hz Ku band backscatter coefficient (OCOG retracking) | dB |
| /data_20/ku/sig0_scaling_factor | Scaling factor for Ku band backscatter coefficient | dB |
| /data_20/ku/sig0_seaice | 20 Hz Ku band backscatter coefficient (sea-ice retracking) | dB |
| /data_20/ku/sig0_tfmra | 20 Hz Ku band backscatter coefficient (TFMRA retracking) | dB |
| /data_20/ku/sigmac_ocean | Ku band width of the leading edge (ocean retracking) | s |
| /data_20/ku/sigmac_ocean_mle3 | Ku band width of the leading edge (MLE3 retracking) | s |
| /data_20/ku/sigmal_ice2 | 20 Hz width of the Ku band leading edge (ice-2 retracking) | m |
| /data_20/ku/slope1_ice2 | 20 Hz slope of the first part of the logarithm of the Ku band trailing edge (ice-2 retracking) | s-1 |
| /data_20/ku/slope2_ice2 | 20 Hz slope of the second part of the logarithm of the Ku band trailing edge (ice-2 retracking) | s-1 |
| /data_20/ku/slope_ice2 | 20 Hz Ku band slope of the logarithm of the trailing edge for mispointing (ice-2 retracking) | s-1 |
| /data_20/ku/swh_adaptive | 20 Hz Ku band corrected significant waveheight (adaptive retracking) | m |
| /data_20/ku/swh_adaptive_compression_qual | 20 Hz flag for utilization in the computation of 1 Hz Ku band significant waveheight (adaptive retracking) | |
| /data_20/ku/swh_ocean | 20 Hz Ku band corrected significant waveheight | m |
| /data_20/ku/swh_ocean_compression_qual | 20 Hz flag for utilization in the computation of 1 Hz Ku band significant waveheight | |
| /data_20/ku/swh_ocean_mle3 | 20 Hz Ku band corrected significant waveheight (MLE3 retracking) | m |
| /data_20/ku/swh_ocean_mle3_compression_qual | 20 Hz flag for utilization in the computation of 1 Hz Ku band significant waveheight (MLE3 retracking) | |
| /data_20/ku/tfmra_qual | 20 Hz Ku band TFMRA retracking quality flag | |
| /data_20/ku/tracker_range_calibrated | 20 Hz Ku band corrected tracker range | m |
| /data_20/ku/tracker_range_diode | 20 Hz Ku band tracker range from Diode+DEM | m |
| /data_20/ku/wvf_main_class | 20 Hz Ku band waveform main class | |
| /data_20/ku/wvf_main_class_score | 20 Hz Ku band waveform main class probability | |
| /data_20/ku/wvf_second_class | 20 Hz Ku band waveform second class | |
| /data_20/ku/wvf_second_class_score | 20 Hz Ku band waveform second class probability | |
| /data_20/latitude | 20 Hz latitude | degrees_north |
| /data_20/longitude | 20 Hz longitude | degrees_east |
| /data_20/meteo_measurement_altitude_interp_qual | 20 Hz meteorological data at measurement altitude interpolation flag | |
| /data_20/model_dry_tropo_cor_measurement_altitude | 20 Hz model dry tropospheric correction at measurement altitude | m |
| /data_20/model_wet_tropo_cor_measurement_altitude | 20 Hz model wet tropospheric correction at measurement altitude | m |
| /data_20/surface_classification_flag | 20 Hz surface classification | |
| /data_20/surface_slope_cor | surface slope correction | m |
| /data_20/time | time 20 Hz in UTC | seconds since 2000-01-01 00:00:00.0 |
| /data_20/time_tai | time 20 Hz in TAI | seconds since 2000-01-01 00:00:00.0 |
| /data_20/tracker_range_counter | 20 Hz tracker range counter [3.125/64 ns] | count |
| /data_20/tracker_range_rate_counter | 20 Hz tracker range rate counter [3.125/1024 ns] | count |
| samples | waveform index | count |
| USER'S GUIDE | |
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| GENERAL DOCUMENTATION | |
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| DATA CITATION GUIDELINES | |
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Citation is critically important for dataset documentation and discovery. Please cite the data as follows, and cite the reference papers when it is appropriate.
| Citation | Surface Water Ocean Topography (SWOT). 2025. SWOT Level 2 Nadir Altimeter Interim Geophysical Data Record with Waveforms - SGDR. Ver. D. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/SWOT-NALT-IGDR-D
For more information see Data Citations and Acknowledgments.
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| Journal Reference | JPL Internal Document. 2018. Surface Water and Ocean Topography Mission (SWOT) Project: Science Requirements Document, JPL D-61923, Rev. B, Jet Propulsion Laboratory. |
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| Version | Dataset | Version Date | Status | |
|---|---|---|---|---|
| D | SWOT Level 2 Nadir Altimeter Interim Geophysical Data Record with Waveforms - SGDR Version D | 2023-03-09 | ACTIVE | 2023-03-09T03:35:00.000Z |
| 2.0 | SWOT Level 2 Nadir Altimeter Interim Geophysical Data Record with Waveforms - SGDR | 2023-03-09 | ACTIVE | 2023-03-09T03:35:00.000Z |
| 1.0 | SWOT Level 2 Nadir Altimeter Interim Geophysical Data Record with Waveforms - SGDR, Version 1.0 | 2023-03-09 | ACTIVE | 2023-03-09T03:35:00.000Z |