National Oceanic and Atmospheric Administration, United States Department of Commerce


Data Description

    OSTM/Jason-2 and Jason-3 Level-2 Operational, Interim and Final Geophysical Data Records (xGDR), 2008-present - This collection contains Ocean Surface Topography Mission (OSTM)/Jason-2 and Jason-3 level-2 Geophysical Data Records (GDR). The GDRs are available as 3 datatypes: Operational Geophysical Data Records (OGDR), Interim Geophysical Data Records (IGDR) and final Geophysical Data Records (GDR). The OGDRs are near-real-time records and are generated every 3-5 hours. They are based on orbits from DORIS propagator and forecast meteorological fields for the geophysical corrections. The IGDRs are based on preliminary DORIS ephemeris, analyzed meteorological grids, and preliminary auxiliary data files. The IGDRs have a latency of 1-2 days. The S-IGDR is a superset of the IGDR, containing the original radar echo "waveform" data. The GDRs are based on final high-precision DORIS (perhaps combined with GPS) ephemeris, final meteorological grids, ancillary and auxiliary data files. The S-GDR is a superset of the GDR, containing the waveform data. Sea Surface Height Anomaly (SSHA) files are available for IGDR and GDR. All files are available in NetCDF format and the OGDRs are also available in BUFR format. Jason-3 X-GDR data follows the structure and filetypes as that of OSTM/Jason-2 data. OSTM/Jason-2 and Jason-3 are follow-on missions continuing the TOPEX/Poseidon and JASON-1 missions, and were designed to ensure continuity of high quality measurements for ocean science and to provide operational products for assimilation and forecasting applications. The missions are a joint effort by National Oceanic and Atmospheric Administration (NOAA), the European Organization for the Exploitation of Meteorological Satellites (EUMETSAT), France’s Centre National d’Études Spatiales (CNES) and the National Aeronautics and Space Administration (NASA). The OSTM/Jason-2 satellite was launched on 20 June 2008 and reached its nominal repetitive orbit on 4 July 2008. After more than 11 years in orbit and well beyond its three- to five-year mission baseline, the Ocean Surface Topography Mission (OSTM) on Jason-2 permanently ceased acquisition of scientific data at 06:48 UTC on 1 October 2019 due to aging-related issues onboard the spacecraft. The development of the Jason-3 mission, and related Ground Segment, is based on a recurrent Jason satellite and ground system with a similar partnership scheme to OSTM/Jason-2. Jason-3 features the Poseidon-3B altimeter, developed by Thales Alenia Space in Toulouse. The Jason-3 satellite was launched on 17 January 2016 from Vandenberg Air Force Base in California, on a SpaceX Falcon 9 launcher, and was placed in the same orbit as OSTM/Jason-2. The satellite went operational on 14 October 2016.

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Operational GDRs
Jason Operational GDR - NetCDF
Jason Operational GDR - BUFR
Jason Operational GDR Sea Surface Height Anomaly - NetCDF
Intermediate GDRs
Jason Interim GDR - NetCDF
Jason Interim Sensor GDR - NetCDF
Jason Interim GDR Sea Surface Height Anomaly - NetCDF
Final GDRs
Jason Final GDR - NetCDF
Jason Final Sensor GDR - NetCDF
Jason Final GDR Sea Surface Height Anomaly - NetCDF

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