NASA-SSH Simple Gridded Sea Surface Height from Standardized Reference Missions Only Version 1

Metadata Updated: July 10, 2025

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.

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Dates

Metadata Created Date	April 11, 2025
Metadata Updated Date	July 10, 2025

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Data.json Data.json Metadata
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Additional Metadata

Resource Type	Dataset
Metadata Created Date	April 11, 2025
Metadata Updated Date	July 10, 2025
Publisher	NASA/JPL/PODAAC
Maintainer	Earthdata Forum
Identifier	10.5067/NSREF-SG0V1
Data Last Modified	2025-07-09
Category	Earth Science
Public Access Level	public
Bureau Code	026:00
Metadata Context	https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Schema Version	https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby	https://project-open-data.cio.gov/v1.1/schema/catalog.json
Harvest Object Id	54a88e72-07f1-4769-8adc-7ffed06da3bf
Harvest Source Id	58f92550-7a01-4f00-b1b2-8dc953bd598f
Harvest Source Title	NASA Data.json
Old Spatial	{"NorthBoundingCoordinate":90,"SouthBoundingCoordinate":-90,"WestBoundingCoordinate":-180,"EastBoundingCoordinate":180},"CARTESIAN"
Program Code	026:000
Source Datajson Identifier	True
Source Hash	46d2cd27be1eebbd2db96a33b5520f419ac8385556312dc6ad3338cfd26a19d8
Source Schema Version	1.1
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