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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; 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



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

Metadata Source

Harvested from NASA Data.json

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Additional Metadata

Resource Type Dataset
Metadata Created Date December 1, 2022
Metadata Updated Date December 6, 2023
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
Metadata Catalog ID
Schema Version
Catalog Describedby
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.
Creator CYGNSS
Graphic Preview Description Thumbnail
Graphic Preview File
Harvest Object Id 3a440354-147a-46fd-a02a-d5242e4a8d10
Harvest Source Id 58f92550-7a01-4f00-b1b2-8dc953bd598f
Harvest Source Title NASA Data.json
Homepage URL
Metadata Type geospatial
Old Spatial -180.0 -40.0 180.0 40.0
Program Code 026:001
Related Documents,,,,,,
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
Temporal 2018-08-01T00:00:00Z/2023-02-28T00:00:00Z

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