NASA-SSH Simple Gridded Sea Surface Height from Standardized Reference Missions Only Version 1
(NASA_SSH_REF_SIMPLE_GRID_V1)| Version | 1 |
| Processing Level | 4 |
| Start/Stop Date | 1992-Oct-25 to Present |
| Short Name | NASA_SSH_REF_SIMPLE_GRID_V1 |
| Description | The NASA-SSH Simple Gridded Sea Surface Height from Standardized Reference Missions Only Version 1 dataset produced by NASA provides 2-D maps of sea surface height, or sea level, anomaly once every 7 days. The grids are based on observations of sea surface height from the radar altimeter satellites in the reference mission orbits, including TOPEX/Poseidon, the Jason series, and Sentinel-6. The data begin in Oct 1992 and continue through the present. They are created using the NASA-SSH Along-Track Sea Surface Height from Standardized Reference Missions Version 1 dataset. The grids consist of 10-days worth of observations, which covers approximately 1 complete repeat cycle of observations from the reference missions. The grids are produced on a 0.5-degree latitude and longitude grid, by taking a simple gaussian weighted spatial average with a width of 100 km. The grids are produced every 7 days to allow for easy interpolation in time. However, since they are created using 10-days of data, there is some overlap of information between adjacent time steps. The grids are also created using the basin flags to avoid mixing data from distinct ocean basins (for example, to avoid mixing observations from the Caribbean Sea with observations from the Pacific across the Isthmus of Panama). Connected basins are allowed to share data, however. This is accomplished by using a table of connections between basins. The basin connection table is available (https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/web-misc/nasa-ssh/basin_connection_table.txt). The basin definitions can be downloaded as a shape file from https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/web-misc/nasa-ssh/basin_polygon_files.tar.gz , or as a kml file https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/web-misc/nasa-ssh/NASA-SSH_Basins.kmz. A new grid will be released approximately once per week, with a latency of a few weeks. |
| DOI | 10.5067/NSREF-SG0V1 |
| Measurement | OCEANS > SEA SURFACE TOPOGRAPHY > SEA SURFACE HEIGHT OCEANS > SEA SURFACE TOPOGRAPHY > SEA SURFACE HEIGHT |
| Platform/Sensor | TOPEX/POSEIDON / Platform Name: Ocean Topography Experiment (TOPEX/POSEIDON) SSALT SENSOR Name: POSEIDON Solid State Radar Altimeter (SSALT) TOPEX/POSEIDON / Platform Name: Ocean Topography Experiment (TOPEX/POSEIDON) NRA SENSOR Name: Nasa Radar Altimeter (NRA) TOPEX/POSEIDON / Platform Name: Ocean Topography Experiment (TOPEX/POSEIDON) TMR SENSOR Name: TOPEX Microwave Radiometer (TMR) JASON-1 / Platform Name: Ocean Topography Experiment (JASON-1) POSEIDON-2 SENSOR Name: JASON-1 RADAR ALTIMETER (POSEIDON-2) JASON-1 / Platform Name: Ocean Topography Experiment (JASON-1) JASON-1 Microwave Radiometer SENSOR Name: JASON-1 Microwave Radiometer (JASON-1 Microwave Radiometer) Show More |
| Data Provider | Publisher: PO.DAAC Creator: Willis, J. K., S. Fournier, K. Marlis, E. Killett and J. Sanchez Release Place: CA, USA Release Date: 2025-Feb-28 |
| Format | netCDF-4 |
| Keyword(s) | SSHA, SSH, SLA, sea surface height, sea level, OST |
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
Resolution Spatial Resolution: 0.5 Decimal Degrees x 0.5 Decimal Degrees Temporal Resolution: Daily - < Weekly Coverage Region: GLOBAL OCEAN North Bounding Coordinate: 90 degrees South Bounding Coordinate: -90 degrees West Bounding Coordinate: -180 degrees East Bounding Coordinate: 180 degrees Time Span: 1992-Oct-25 to Present |
| DIRECT ACCESS | |
| Browse Granule Listing | |
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| DIRECT S3-ACCESS | |
| Available for access in-region with AWS Cloud | |
Region | |
| us-west-2 | |
| podaac-ops-cumulus-protected/NASA_SSH_REF_SIMPLE_GRID_V1/ | |
| podaac-ops-cumulus-public/NASA_SSH_REF_SIMPLE_GRID_V1/ | |
AWS S3 Credentials | |
| Get AWS S3 Credentials | Documentation | |
| Name | Long Name | Unit |
|---|---|---|
| basin_flag | Basin ID number mapping to a geographic basin | |
| basin_names_table | Table mapping basin ID numbers to basin names | |
| counts | number of data values used in weighting each element in SSHA | |
| latitude | latitude | degrees_north |
| longitude | longitude | degrees_east |
| ssha | sea surface height anomaly | m |
| time | time | seconds since 1990-01-01 |
| GENERAL DOCUMENTATION | |
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| DATA CITATION GUIDELINES | |
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| USER'S GUIDE | |
| USER FEEDBACK PAGE | |
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| PRODUCT USAGE | |
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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 | Willis, J. K., S. Fournier, K. Marlis, E. Killett and J. Sanchez. 2025. NASA-SSH: JPL Sea Surface Height Anomalies, Version 1.. Ver. 1. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/NSREF-SG0V1
For more information see Data Citations and Acknowledgments.
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