SWOT Level 2 Nadir Altimeter Geophysical Data Record with Waveforms - SGDR
(SWOT_L2_NALT_GDR_SGDR_2.0)| Version | 2.0 |
| Processing Level | 2 |
| Start/Stop Date | 2022-Dec-16 to Present |
| Short Name | SWOT_L2_NALT_GDR_SGDR_2.0 |
| Description | The SWOT Level 2 Nadir Altimeter Geophysical Data Record (GDR) with Waveforms dataset produced by the Surface Water and Ocean Topography (SWOT) mission provides sea surface height, significant wave height and wind speed measurements from the Poseidon-3C nadir altimeter, a Jason-class dual frequency (Ku/C) altimeter. SWOT is a joint mission between NASA and CNES that launched on December 16, 2022. It aims to measure ocean surface topography with unprecedented resolution and accuracy, as well as map inland water bodies globally. The GDR dataset consists of discrete measurements for each half orbit along the ground track with sampling resolutions of approximately 6-km and 300-m at 1Hz and 20Hz, respectively. The data were processed using restituted auxiliary data and the Precise Orbit Ephemeris (POE). The data are available with latency of < 90 days and distributed in netCDF-4 file format.
This collection is a sub-collection of its parent: https://podaac.jpl.nasa.gov/dataset/SWOT_L2_NALT_GDR_2.0 |
| DOI | 10.5067/SWOT-NALT-GDR-2.0 |
| 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: 2023-Jun-01 |
| 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 |
| DIRECT ACCESS | |
| Browse Granule Listing | |
| Search Granules | |
| DIRECT S3-ACCESS | |
| Available for access in-region with AWS Cloud | |
Region | |
| us-west-2 | |
| podaac-swot-ops-cumulus-protected/SWOT_L2_NALT_GDR_2.0/ | |
| podaac-swot-ops-cumulus-public/SWOT_L2_NALT_GDR_2.0/ | |
AWS S3 Credentials | |
| Get AWS S3 Credentials | Documentation | |
| 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 qualiy 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 |
| DATA CITATION GUIDELINES | |
| |
| USER'S GUIDE | |
| |
| GENERAL DOCUMENTATION | |
| |
| |
| |
| |
|
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). 2023. SWOT Level 2 Nadir Altimeter Geophysical Data Record with Waveforms - SGDR, Version 2.0. Ver. 2.0. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/SWOT-NALT-GDR-2.0
For more information see Data Citations and Acknowledgments.
|
||||||||
| 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. |
||||||||
| Version | Dataset | Version Date | Status | |
|---|---|---|---|---|
| D | SWOT Level 2 Nadir Altimeter Geophysical Data Record with Waveforms - SGDR Version D | 2023-03-09 | ACTIVE | 2023-03-09T03:45:00.000Z |
| 2.0 | SWOT Level 2 Nadir Altimeter Geophysical Data Record with Waveforms - SGDR | 2023-03-09 | SUPERSEDED | 2023-03-09T03:45:00.000Z |
| 1.0 | SWOT Level 2 Nadir Altimeter Geophysical Data Record with Waveforms - SGDR, Version 1.0 | 2023-03-09 | RETIRED. | 2023-03-09T03:45:00.000Z |