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OSTM/Jason-2 Data Collection, 2008 to 2019 (NCEI Accession 0118277)


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            title:  OSTM/Jason-2 Data Collection, 2008 to 2019 (NCEI Accession 0118277)
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                date:  2020-04-27
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        abstract:  The Ocean Surface Topography Mission (OSTM)/Jason-2 data collection includes: Level-2 Geophysical Data Records (GDRs), Ancillary Files, Auxiliary Files, Near Real-Time Altimetry Validation System (NRTAVS) QA Reports, Orbital Information, and Telemetry. The level-2 X-GDR 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. The S-GDRs are generated every 10 days. 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. Ancillary data files are used to generate Level-2 products. They include both static tabular data files and dynamic files which change/grow over time. They are mission specific files used in the production of Level-2 products. All Ancillary data were made unrestricted on 15 December, 2008. Orbital files are produced by CNES for offline (IGDR, GDR) data production. For GPSP1, intermediate level-1 data files are in RINEX format and from the Global Positioning System (GPS) receiver and are used to compute precise GPS orbits for the spacecraft. For TLE - Two Line Element files are used to determine the position and velocity of the satellite. For MOE and POE, medium-precision and precision orbital ephemeris files are from the DORIS system. All Orbital Information data were made unrestricted on 15 December, 2008. Auxiliary data files are used to generate Level-2 products. They include both static tabular data files and dynamic files which change/grow over time. Auxiliary files are produced outside of OSTM but are used in the production of Level-2 products. Auxiliary data, which are produced by the European Center for Medium range Weather Forecasting (ECMWF), are restricted by ECMWF to the OSTM/Jason-2 project team. The telemetry dataset consists of raw Level-0 telemetry data from the OSTM/Jason-2 spacecraft. There are three datatypes available: Housekeeping Telemetry - Recorded (HKTM-R) is stored on the spacecraft for later downlink; Payload Telemetry 1 (PLTM-1) is the payload science data from the core-mission payloads - Poseidon-3, DORIS, AMR, and GPSP; and Payload Telemetry 2 (PLTM-2) is the payload science data from the passenger mission of opportunity payloads: CARMEN-2, L2T2 and LPT. They are available as CCSDS packet files. All telemetry data are restricted to the project team, per the mission's 4-partner Memorandum of Understanding. Quality reports are from the Near Real-Time Altimetry Validation System. Reports are daily and cover the previous 10-day period.
        purpose:  This dataset is available to the public for a wide variety of uses including scientific research and analysis.
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                    date:  2008-12-15
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                            description:  Global Change Master Directory (GCMD). 2023. GCMD Keywords, Version 17. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords
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                title:  OSTM/Jason-2 and Jason-3 Documentation and Data Documentation Records, 2008 to present
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                title:  Zhang, Yongsheng; US National Oceanographic Data Center (2020). OSTM/Jason-2 and Jason-3 Data Documentation Records (NCEI Accession 0118276). NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/0118276.
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        supplementalInformation:  OSTM/Jason-2 was a follow-on mission continuing the TOPEX/Poseidon and JASON-1 missions, and was designed to ensure continuity of high quality measurements for ocean science and to provide operational products for assimilation and forecasting applications. 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.
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                description:  NCEI Accession 0118277 v1.1 was published.
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                  DateTime:  2020-04-27T22:24:18Z
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                        title:  NCEI Accession 0118277 v1.1
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            description:  Doppler Orbitography and Radiopositioning Integrated from Space The DORIS system uses a ground network of orbitography beacons spread around the globe, which send signals at two frequencies to a receiver on the satellite. The relative motion of the satellite generates a shift in the signal's frequency (called the Doppler shift) that is measured to derive the satellite's velocity. These data are then assimilated in orbit determination models to keep permanent track of the satellite's precise position (to within three centimetres) on its orbit. Jason-2 is a French-U.S. satellite launched in 2008 designed to measure rising sea levels and track the effects of climate change. Jason-2 data are being archived by the NODC as part of the Comprehensive Large Array-data Stewardship System (CLASS).
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            description:  Laser Retroreflector Array The LRA is a totally passive reflector designed to reflect laser pulses back to their point of origin on Earth. It is used for calibrating the satellite's Precise Orbit Determination system. Jason-2 is a French-U.S. satellite launched in 2008 designed to measure rising sea levels and track the effects of climate change. Jason-2 data are being archived by the NODC as part of the Comprehensive Large Array-data Stewardship System (CLASS).
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            description:  A generic class used for unknown satellite sensor type, or datasets consisting of blended, merged, or otherwise mixed observations from multiple satellite sensor types