SWOT Level 2 KaRIn Low Rate Sea Surface Height Data Product - Expert, Version D
(SWOT_L2_LR_SSH_EXPERT_D)| Version | D |
| Processing Level | 2 |
| Start/Stop Date | 2022-Dec-16 to Present |
| Short Name | SWOT_L2_LR_SSH_EXPERT_D |
| Description | The SWOT Level 2 KaRIn Low Rate Sea Surface Height Expert Data Product from the Surface Water Ocean Topography (SWOT) mission provides global sea surface height and significant wave height observations derived from low rate (LR) measurements from the Ka-band Radar Interferometer (KaRIn). SWOT launched on December 16, 2022 from Vandenberg Air Force Base in California into a 1-day repeat orbit for the "calibration" or "fast-sampling" phase of the mission, which completed in early July 2023. After the calibration phase, SWOT entered a 21-day repeat orbit in August 2023 to start the "science" phase of the mission, which is expected to continue through 2025. The L2 sea surface height data product is distributed in one netCDF-4 file per pass (half-orbit) covering the full KaRIn swath width, which spans 10-60km on each side of the nadir track. Sea surface height, sea surface height anomaly, wind speed, significant waveheight, and related parameters are provided on a geographically fixed, swath-aligned 2x2 km2 grid (Basic, Expert, Windwave). The sea surface height data are also provided on a finer 250x250 m2 "native" grid with minimal smoothing applied (Unsmoothed). This collection is a sub-collection of its parent: https://podaac.jpl.nasa.gov/dataset/SWOT_L2_LR_SSH_D It provides the "Expert" file from each L2 SSH product, which contain all related variables and is intended for expert users. |
| DOI | 10.5067/SWOT-SSH-D |
| Measurement | OCEANS > SEA SURFACE TOPOGRAPHY > SEA SURFACE HEIGHT OCEANS > OCEAN WAVES > SIGNIFICANT WAVE HEIGHT |
| Swath Width | 120 km |
| Platform/Sensor | SWOT / Platform Name: Surface Water Ocean Topography (SWOT) KaRIn SENSOR Name: Ka-band Radar Interferometer (KaRIn) 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. SWOT / Platform Name: Surface Water Ocean Topography (SWOT) DORIS SENSOR Name: Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS) SWOT / Platform Name: Surface Water Ocean Topography (SWOT) GPSP SENSOR Name: Global Positioning System Payload (GPSP) Show More |
| Project | Surface Water Ocean Topography (SWOT) |
| Data Provider | Publisher: JPL NASA Creator: Surface Water Ocean Topography (SWOT) Release Place: Jet Propulsion Laboratory Release Date: 2025-May-13 Resource: https://swot.jpl.nasa.gov/ |
| Format | netCDF-4 |
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
Resolution Spatial Resolution: 2 Kilometers x 2 Kilometers Coverage Region: GLOBAL North Bounding Coordinate: 90 degrees South Bounding Coordinate: -90 degrees West Bounding Coordinate: -180 degrees East Bounding Coordinate: 180 degrees Time Span: 2022-Dec-16 to PresentSwath Width: 120 km Projection Ellipsoid: WGS 84 |
| DIRECT ACCESS | |
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| OPENDAP DATA | |
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| This dataset can be downloaded using the podaac-data-subscriber (the recommended tool for bulk downloading PO.DAAC data). It is a Python package for downloading one or many files using the command line interface. The URL redirects to the data-subscriber home page with instructions for utilizing the tool | |
| DIRECT S3-ACCESS | |
| Available for access in-region with AWS Cloud | |
Region | |
| us-west-2 | |
| podaac-swot-ops-cumulus-protected/SWOT_L2_LR_SSH_D/ | |
| podaac-swot-ops-cumulus-public/SWOT_L2_LR_SSH_D/ | |
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| TOOLS AND SERVICES | |
| Data Subscriber | |
| This dataset can be accessed with the Harmony subsetter service to subset and regrid data on-the-fly. Several subsetting options are available such as spatial, variable, temporal, and vertical level. The URL redirects to a general page with information about utilizing the service. An example query: https://harmony.earthdata.nasa.gov/C3378626164-POCLOUD/ogc-api-coverages/1.0.0/collections/all/coverage/rangeset?subset=lat(minLat:maxLat)&subset=lon(minLon:maxLon)&subset=time(startTime:stopTime)&format=application%2Fx-netcdf4 | |
| Name | Long Name | Unit |
|---|---|---|
| ancillary_surface_classification_flag | surface classification | |
| cross_track_angle | cross-track angle from true north | degrees |
| cross_track_distance | cross track distance | m |
| dac | dynamic atmospheric correction | m |
| depth_or_elevation | ocean depth or land elevation | m |
| distance_to_coast | distance to coast | m |
| doppler_centroid | doppler centroid estimated by KaRIn | 1/s |
| dynamic_ice_flag | dynamic ice flag | |
| geoid | geoid height | m |
| heading_to_coast | heading to coast | degrees |
| height_cor_xover | height correction from crossover calibration | m |
| height_cor_xover_qual | quality flag for height correction from crossover calibration | |
| ice_conc | concentration of sea ice | % |
| internal_tide_hret | coherent internal tide (HRET) | m |
| internal_tide_sol2 | coherent internal tide (Model 2) | m |
| inv_bar_cor | static inverse barometer effect on sea surface height | m |
| iono_cor_gim_ka | ionosphere vertical correction | m |
| latitude | latitude (positive N, negative S) | degrees_north |
| latitude_avg_ssh | weighted average latitude of samples used to compute SSH | degrees_north |
| latitude_nadir | latitude of satellite nadir point | degrees_north |
| load_tide_fes | geocentric load tide height (FES) | m |
| load_tide_got | geocentric load tide height (GOT) | m |
| longitude | longitude (degrees East) | degrees_east |
| longitude_avg_ssh | weighted average longitude of samples used to compute SSH | degrees_east |
| longitude_nadir | longitude of satellite nadir point | degrees_east |
| mean_dynamic_topography | mean dynamic topography | m |
| mean_dynamic_topography_uncert | mean dynamic topography accuracy | m |
| mean_sea_surface_cnescls | mean sea surface height (CNES/CLS) | m |
| mean_sea_surface_cnescls_uncert | mean sea surface height accuracy (CNES/CLS) | m |
| mean_sea_surface_dtu | mean sea surface height (DTU) | m |
| mean_sea_surface_dtu_uncert | mean sea surface height accuracy (DTU) | m |
| mean_wave_direction | mean sea surface wave direction | degree |
| mean_wave_period_t02 | t02 mean wave period | s |
| model_dry_tropo_cor | dry troposphere vertical correction | m |
| model_wet_tropo_cor | wet troposphere vertical correction from weather model data | m |
| num_pt_avg | number of samples averaged | 1 |
| obp_ref_surface | height of reference surface used by on-board-processor | m |
| ocean_tide_eq | equilibrium long-period ocean tide height | m |
| ocean_tide_fes | geocentric ocean tide height (FES) | m |
| ocean_tide_got | geocentric ocean tide height (GOT) | m |
| ocean_tide_non_eq | non-equilibrium long-period ocean tide height | m |
| orbit_alt_rate | orbital altitude rate with respect to mean sea surface | m/s |
| orbit_qual | orbit quality flag | |
| phase_bias_ref_surface | height of reference surface used for phase bias calculation | m |
| polarization_karin | polarization for each side of the KaRIn swath | |
| pole_tide | geocentric pole tide height | m |
| rad_cloud_liquid_water | liquid water content from radiometer | kg/m^2 |
| rad_surface_type_flag | radiometer surface type flag | |
| rad_tmb_187 | radiometer main beam brightness temperature at 18.7 GHz | K |
| rad_tmb_238 | radiometer main beam brightness temperature at 23.8 GHz | K |
| rad_tmb_340 | radiometer main beam brightness temperature at 34.0 GHz | K |
| rad_water_vapor | water vapor content from radiometer | kg/m^2 |
| rad_wet_tropo_cor | wet troposphere vertical correction from radiometer data | m |
| rain_flag | rain flag | |
| rain_rate | rain rate from weather model | mm/hr |
| sc_altitude | altitude of KMSF origin | m |
| sc_event_flag | spacecraft event flag | |
| sc_pitch | pitch of the spacecraft | degrees |
| sc_roll | roll of the spacecraft | degrees |
| sc_yaw | yaw of the spacecraft | degrees |
| sea_state_bias_cor | sea state bias correction | m |
| sea_state_bias_cor_2 | sea state bias correction | m |
| sig0_cor_atmos_model | two-way atmospheric correction to sigma0 from model | 1 |
| sig0_cor_atmos_rad | two-way atmospheric correction to sigma0 from radiometer data | 1 |
| sig0_karin | normalized radar cross section (sigma0) from KaRIn | 1 |
| sig0_karin_2 | normalized radar cross section (sigma0) from KaRIn | 1 |
| sig0_karin_2_qual | quality flag for sigma0 from KaRIn. | |
| sig0_karin_qual | quality flag for sigma0 from KaRIn. | |
| sig0_karin_uncert | 1-sigma uncertainty on sigma0 from KaRIn | 1 |
| solid_earth_tide | solid Earth tide height | m |
| ssh_karin | sea surface height | m |
| ssh_karin_2 | sea surface height | m |
| ssh_karin_2_qual | quality flag for sea surface height from KaRIn | |
| ssh_karin_qual | quality flag for sea surface height from KaRIn | |
| ssh_karin_uncert | sea surface height anomaly uncertainty | m |
| ssha_karin | sea surface height anomaly | m |
| ssha_karin_2 | sea surface height anomaly | m |
| ssha_karin_2_qual | sea surface height anomaly quality flag | |
| ssha_karin_qual | sea surface height anomaly quality flag | |
| swh_karin | significant wave height from KaRIn | m |
| swh_karin_qual | quality flag for significant wave height from KaRIn. | |
| swh_karin_uncert | 1-sigma uncertainty on significant wave height from KaRIn | m |
| swh_model | significant wave height from wave model | m |
| swh_nadir_altimeter | significant wave height from nadir altimeter | m |
| swh_ssb_cor_source | source flag for significant wave height information used to compute sea state bias correction | |
| swh_ssb_cor_source_2 | source flag for significant wave height information used to compute sea state bias correction | |
| swh_wind_speed_karin_source | source flag for significant wave height information used to compute wind speed from KaRIn | |
| swh_wind_speed_karin_source_2 | source flag for significant wave height information used to compute wind speed from KaRIn | |
| time | time in UTC | seconds since 2000-01-01 00:00:00.0 |
| time_tai | time in TAI | seconds since 2000-01-01 00:00:00.0 |
| velocity_heading | heading of the spacecraft Earth-relative velocity vector | degrees |
| volumetric_correlation | volumetric correlation | 1 |
| volumetric_correlation_uncert | volumetric correlation standard deviation | 1 |
| wind_speed_karin | wind speed from KaRIn | m/s |
| wind_speed_karin_2 | wind speed from KaRIn | m/s |
| wind_speed_karin_2_qual | quality flag for wind speed from KaRIn. | |
| wind_speed_karin_qual | quality flag for wind speed from KaRIn. | |
| wind_speed_model_u | u component of model wind | m/s |
| wind_speed_model_v | v component of model wind | m/s |
| wind_speed_rad | wind speed from radiometer | m/s |
| wind_speed_ssb_cor_source | source flag for wind speed information used to compute sea state bias correction | |
| wind_speed_ssb_cor_source_2 | source flag for wind speed information used to compute sea state bias correction | |
| x_factor | radiometric calibration X factor as a composite value for the X factors of the +y and -y channels | 1 |
| USER'S GUIDE | |
| GENERAL DOCUMENTATION | |
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| DATA CITATION GUIDELINES | |
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| ALGORITHM THEORETICAL BASIS DOCUMENT (ATBD) | |
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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 KaRIn Low Rate Sea Surface Height Data Product - Expert, Version D. Ver. D. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/SWOT-SSH-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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