NASA-SSH Simple Gridded Sea Surface Height from Standardized Reference Missions Only Version 1.1

The NASA-SSH Simple Gridded Sea Surface Height from Standardized Reference Missions Only Version 1.1 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, and the basin definitions as a shape file or as a kml file can be downloaded from the associated documentation.

A new grid will be released approximately once per week, with a latency of a few weeks.

Data and Resources

Additional Info

Field Value
Maintainer Earthdata Forum
Last Updated November 3, 2026, 05:20 (UTC)
Created June 3, 2026, 02:24 (UTC)
Identifier 10.5067/NSREF-SG0V11
Modified 2026-10-26T22:16:12Z
Theme {"Earth Science"}
accessLevel public
bureauCode {026:00}
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
harvest_object_id eabc859b-cf1d-4b36-bb27-28105ad9b947
harvest_source_id b99e41c6-fe79-4c19-bbc3-9b6c8111bfac
harvest_source_title Science Discovery Engine
license https://www.usa.gov/government-works
programCode {026:000}
publisher NASA/JPL/PODAAC
resource-type Dataset
source_datajson_identifier true
source_hash efc33a6e4dcaaf6e52eda681f6b8c8fba01d9ddbb07728342a6490962c91b346
source_schema_version 1.1
spatial ["CARTESIAN", [{"NorthBoundingCoordinate": 90, "SouthBoundingCoordinate": -90, "WestBoundingCoordinate": -180, "EastBoundingCoordinate": 180}]]
temporal 1992-10-21/2026-10-26