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    • CYGNSS Level 2 Science Data Record Version 2.1

    Metadata Updated: December 6, 2023

    This dataset contains the Version 2.1 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 2.0. 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. The Version 2.1 release represents the second science-quality release. Here is a summary of improvements that reflect the quality of the Version 2.1 data release: 1) revised Geophysical Model Functions (GMFs) for both Fully Developed Seas (FDS) and Young Seas with Limited Fetch conditions, to be consistent with the calibration changes made to the v2.1 Level 1 science data products.; 2) Revised covariance matrix between DDMA and LES versions of the FDS wind speed retrieval, used by the minimum variance estimator, resulting from changes made to the v2.1 Level 1 science data products; 3) Revised debiasing algorithm coefficients used by the FDS L2 retrieval algorithm, resulting from changes made to the v2.1 Level 2 science data products; 4) revised quality control (Q/C) flags related to the required level of consistency between DDMA and LES versions of the FDS wind speed retrieval (the errors in the two retrievals are now less correlated so larger discrepancies are allowed; if either retrieval is not available, the sample receives a fatal Q/C flag); 5) new Q/C flag related to the block type of the GPS satellite which provided the transmitted signal. Samples using block II-F signals receive a fatal Q/C flag due to the higher level of uncertainty in their radiated power; 6) revised wind speed uncertainty values as a function of RCG and wind speed, plus a new dependence of the uncertainty on GPS block type to reflect the higher uncertainty in GPS radiated power for block II-F satellites.

    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/10.1175/JTECH-D-20-0079.1

    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 C2251464495-POCLOUD
    Data First Published 2018-05-14
    Language en-US
    Data Last Modified 2018-05-14
    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. 2018-09-21. CYGNSS Level 2 Science Data Record. Version 2.1. CYGNSS Level 2 Science Data Record Version 2.1. PO.DAAC. Archived by National Aeronautics and Space Administration, U.S. Government, PO.DAAC. https://doi.org/10.5067/CYGNS-L2X21. https://cygnss.engin.umich.edu/. CYGNSS, PO.DAAC, 2018-09-21, CYGNSS Level 2 Science Data Record Version 2.1, https://cygnss.engin.umich.edu/.
    Creator CYGNSS
    Graphic Preview Description Thumbnail
    Graphic Preview File https://podaac.jpl.nasa.gov/Podaac/thumbnails/CYGNSS_L2_V2.1.jpg
    Harvest Object Id 6abe3238-456d-4da2-8dbc-c4e09f47ce4c
    Harvest Source Id 58f92550-7a01-4f00-b1b2-8dc953bd598f
    Harvest Source Title NASA Data.json
    Homepage URL https://doi.org/10.5067/CYGNS-L2X21
    Metadata Type geospatial
    Old Spatial -180.0 -40.0 180.0 40.0
    Program Code 026:001
    Related Documents https://doi.org/10.1175/JTECH-D-20-0079.1
    Release Place PO.DAAC
    Series Name CYGNSS Level 2 Science Data Record
    Source Datajson Identifier True
    Source Hash d0a751f1b4dc802d92dd0f98471229d94f9a327e0be8ded5a4b132cc4bbc5a7e
    Source Schema Version 1.1
    Spatial
    Temporal 2017-03-18T00:00:00Z/2023-03-01T00:00:00Z

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