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    • CYGNSS Level 2 Science Data Record Version 3.1

    Metadata Updated: December 6, 2023

    This dataset contains the Version 3.1 CYGNSS Level 2 Science Data Record which provides the time-tagged and geolocated average wind speed (m/s) and mean square slope (MSS) with 25x25 kilometer resolution from the Delay Doppler Mapping Instrument aboard the CYGNSS satellite constellation. This version supersedes Version 3.0; https://doi.org/10.5067/CYGNS-L2X30. The reported sample locations are determined by the specular points corresponding to the Delay Doppler Maps (DDMs). A subset of DDM data used in the direct processing of the average wind speed and MSS is co-located inside of the Level 2 data files. Only one netCDF data file is produced each day (each file containing data from up to 8 unique CYGNSS spacecraft) with a latency of approximately 6 days (or better) from the last recorded measurement time. Here is a summary of processing changes reflected in the v3.1 data: The L2 Geophysical Model Functions (GMFs) that map L1 observables to ocean surface wind speed were rederived to be consistent with the v3.1 L1 calibration. The method used for deriving the GMFs is the same as for v3.0. A new correction has been added to both the Fully Developed Seas (FDS) and Young Seas Limited Fetch (YSLF) wind speed products that is a function of the Significant Wave Height (SWH) of the ocean surface. The correction is based on an observed correlation between the wind speed error and SWH. The SWH value used by the correction algorithm is the ERA5 reanalysis product, coincident in space and time with a CYGNSS measurement. The FDS and YSLF retrieval algorithms are otherwise the same as v3.0.

    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.

    Downloads & Resources

    References

    https://doi.org/10.1109/JSTARS.2018.2833075
    https://doi.org/10.1175/BAMS-D-14-00218.1
    https://doi.org/10.1175/BAMS-D-18-0337.1
    https://doi.org/10.1109/TGRS.2016.2541343
    https://doi.org/10.1109/TGRS.2021.3120026
    https://doi.org/10.3390/rs13214313
    https://doi.org/10.1109/TGRS.2021.3070238

    Dates

    Metadata Created Date December 1, 2022
    Metadata Updated Date December 6, 2023

    Metadata Source

    Harvested from NASA Data.json

    Other Data Resources

    Graphic Preview

    Thumbnail

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date December 1, 2022
    Metadata Updated Date December 6, 2023
    Publisher NASA/JPL/PODAAC
    Maintainer
    Identifier C2183155461-POCLOUD
    Data First Published 2021-12-12
    Language en-US
    Data Last Modified 2021-12-12
    Category CYGNSS, geospatial
    Public Access Level public
    Bureau Code 026:00
    Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
    Metadata Catalog ID https://data.nasa.gov/data.json
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Citation CYGNSS. 2021-12-20. CYGNSS Level 2 Science Data Record Version 3.1. Version 3.1. CYGNSS Level 2 Science Data Record Version 3.1. PO.DAAC. Archived by National Aeronautics and Space Administration, U.S. Government, PO.DAAC. https://doi.org/10.5067/CYGNS-L2X31. https://cygnss.engin.umich.edu/.
    Creator CYGNSS
    Graphic Preview Description Thumbnail
    Graphic Preview File https://podaac.jpl.nasa.gov/Podaac/thumbnails/CYGNSS_L2_V3.1.jpg
    Harvest Object Id 3a440354-147a-46fd-a02a-d5242e4a8d10
    Harvest Source Id 58f92550-7a01-4f00-b1b2-8dc953bd598f
    Harvest Source Title NASA Data.json
    Homepage URL https://doi.org/10.5067/CYGNS-L2X31
    Metadata Type geospatial
    Old Spatial -180.0 -40.0 180.0 40.0
    Program Code 026:001
    Related Documents https://doi.org/10.1109/JSTARS.2018.2833075, https://doi.org/10.1175/BAMS-D-14-00218.1, https://doi.org/10.1175/BAMS-D-18-0337.1, https://doi.org/10.1109/TGRS.2016.2541343, https://doi.org/10.1109/TGRS.2021.3120026, https://doi.org/10.3390/rs13214313, https://doi.org/10.1109/TGRS.2021.3070238
    Release Place PO.DAAC
    Series Name CYGNSS Level 2 Science Data Record Version 3.1
    Source Datajson Identifier True
    Source Hash 53f35c9b1ae5ef0db0817071d82550aa3a143f15e24ae6d6d0d56e802c029c63
    Source Schema Version 1.1
    Spatial
    Temporal 2018-08-01T00:00:00Z/2023-02-28T00:00:00Z

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