NASA-SSH Along-Track Sea Surface Height from Standardized Reference Missions Version 1
(NASA_SSH_REF_ALONGTRACK_V1)| Version | 1 |
| Processing Level | 2 |
| Start/Stop Date | 1992-Oct-25 to Present |
| Short Name | NASA_SSH_REF_ALONGTRACK_V1 |
| Description | The NASA-SSH Along-Track Sea Surface Height from Standardized Reference Missions Version 1 dataset produced by NASA provide observations of sea surface height, or sea level, anomaly measured using radar altimeter satellites in the reference mission orbit. These include TOPEX/Poseidon, the Jason series, and Sentinel-6. The data begin in Oct 1992, with data from TOPEX/Poseidon, and continues to the present. In this data set all missions have been referenced to a common baseline, additional quality control has been performed, and errors with wavelengths around one orbital cycle have been reduced. The data consist of along-track observations of sea surface height, collected approximately once per second (1 Hz), and are parsed into files containing one day’s worth of data per file. A flag variable is included to allow users to easily select only valid observations, and a variable containing sea surface height with the flag applied and a small amount along track smoothing (~20 km), is suggested for most users. Additionally, a “basin” flag variable is provided, along with a table defining it. This allows users to easily select all observations from a specific body of water. The basin flag assigns a number to each point corresponding to a specific ocean basin or lake. A table is included with a text description of each basin number. A text version of that table is available (https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/web-misc/nasa-ssh/basin_name_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. New data will be released approximately once per week, with a latency of a few weeks. |
| DOI | 10.5067/NSREF-AT0V1 |
| 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 |
| Project | NASA Sea Surface Height Products based on Radar Altimetry (NASA-SSH) |
| 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: 10 Kilometers x 10 Kilometers 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 | |
| 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-ops-cumulus-protected/NASA_SSH_REF_ALONGTRACK_V1/ | |
| podaac-ops-cumulus-public/NASA_SSH_REF_ALONGTRACK_V1/ | |
AWS S3 Credentials | |
| Get AWS S3 Credentials | Documentation | |
| TOOLS AND SERVICES | |
| 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 |
|---|---|---|
| basin_flag | Basin ID number mapping each observation to a geographic basin | |
| basin_names_table | Table mapping basin ID numbers to basin names | |
| cycle | Satellite cycle number | |
| dac | dynamic atmospheric correction | m |
| latitude | latitude | degrees_north |
| longitude | longitude | degrees_east |
| median_filter_flag | median filter flag | |
| nasa_flag | NASA SSHA quality flag | |
| oer | Orbit error reduction | m |
| pass | Satellite pass number | |
| source_flag | Source data flag | |
| ssha | Sea surface height anomaly relative to mean_sea_surface | m |
| ssha_smoothed | Smoothed sea surface height anomaly relative to mean_sea_surface | 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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| SCIENCE DATA PRODUCT SOFTWARE DOCUMENTATION | |
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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-AT0V1
For more information see Data Citations and Acknowledgments.
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