SWOT Level 2 KaRIn Low Rate Sea Surface Height Data Product - WindWave, Version D
(SWOT_L2_LR_SSH_WINDWAVE_D)| Version | D |
| Processing Level | 2 |
| Start/Stop Date | 2022-Dec-16 to Present |
| Short Name | SWOT_L2_LR_SSH_WINDWAVE_D |
| Description | The SWOT Level 2 KaRIn Low Rate Sea Surface Height Windwave 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 "Windwave" file from each L2 SSH product, which includes significant wave height (SWH), normalized radar cross section (NRCS or backscatter cross section or sigma0), wind speed derived from sigma0 and SWH, model information on wind and waves, and quality flags. |
| 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 | |
| Browse Granule Listing | |
| OPENDAP DATA | |
| Search Granules | |
| 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/ | |
AWS S3 Credentials | |
| Get AWS S3 Credentials | Documentation | |
| 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 | |
| distance_to_coast | distance to coast | m |
| dynamic_ice_flag | dynamic ice flag | |
| heading_to_coast | heading to coast | degrees |
| latitude | latitude (positive N, negative S) | degrees_north |
| longitude | longitude (degrees East) | degrees_east |
| mean_wave_direction | mean sea surface wave direction | degree |
| mean_wave_period_t02 | t02 mean wave period | s |
| num_pt_avg | number of samples averaged | 1 |
| polarization_karin | polarization for each side of the KaRIn swath | |
| rad_surface_type_flag | radiometer surface type flag | |
| rain_flag | rain flag | |
| 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 |
| 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_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 |
| 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 |
| USER'S GUIDE | |
| GENERAL DOCUMENTATION | |
| |
| |
| |
| |
| DATA CITATION GUIDELINES | |
| |
| ALGORITHM THEORETICAL BASIS DOCUMENT (ATBD) | |
| |
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 - WindWave, 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.
|
||||||||
| 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. |
||||||||