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CYGNSS Level 1 Science Data Record Version 3.0

Metadata Updated: December 7, 2023

This Level 1 (L1) dataset contains the Version 3.0 geo-located Delay Doppler Maps (DDMs) calibrated into Power Received (Watts) and Bistatic Radar Cross Section (BRCS) expressed in units of m2 from the Delay Doppler Mapping Instrument aboard the CYGNSS satellite constellation. This version supersedes Version 2.1; Other useful scientific and engineering measurement parameters include the DDM of Normalized Bistatic Radar Cross Section (NBRCS), the Delay Doppler Map Average (DDMA) of the NBRCS near the specular reflection point, and the Leading Edge Slope (LES) of the integrated delay waveform. The L1 dataset contains a number of other engineering and science measurement parameters, including sets of quality flags/indicators, error estimates, and bias estimates as well as a variety of orbital, spacecraft/sensor health, timekeeping, and geolocation parameters. At most, 8 netCDF data files (each file corresponding to a unique spacecraft in the CYGNSS constellation) are provided each day; under nominal conditions, there are typically 6-8 spacecraft retrieving data each day, but this can be maximized to 8 spacecraft under special circumstances in which higher than normal retrieval frequency is needed (i.e., during tropical storms and or hurricanes). Latency is approximately 6 days (or better) from the last recorded measurement time. Here is a summary of improvements the calibration and processing changes to the Version 3.0 data: 1) the transmitted GPS signal strength in the direction of the DDM scattering surface is determined in real time from measurements of the direct signal from the GPS satellite to the CYGNSS navigation receiver, allowing for the BRCS calibration to be corrected for variations in GPS transmit power; 2) the NBRCS has been validated using comparisons with a large population of modeled values derived from coincident ocean surface roughness spectra produced by the NOAA WAVEWATCH-3 oceanographic wave model; 3) L1 calibration parameters have been adjusted to produce a best fit to the model population.

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 7, 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 7, 2023
Identifier C2205618435-POCLOUD
Data First Published 2020-09-22
Language en-US
Data Last Modified 2020-09-22
Category CYGNSS, geospatial
Public Access Level public
Bureau Code 026:00
Metadata Context
Metadata Catalog ID
Schema Version
Catalog Describedby
Citation CYGNSS. 2020-10-28. CYGNSS Level 1 Science Data Record. Version 3.0. CYGNSS Level 1 Science Data Record Version 3.0. PO.DAAC. Archived by National Aeronautics and Space Administration, U.S. Government, PO.DAAC. CYGNSS, PO.DAAC, 2020-10-28, CYGNSS Level 1 Science Data Record Version 3.0,
Creator CYGNSS
Graphic Preview Description Thumbnail
Graphic Preview File
Harvest Object Id 7afa33bf-7559-4bbb-bed7-df073ddc5a4c
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 1 Science Data Record
Source Datajson Identifier True
Source Hash ed64a96721f28fa1cb1e2fd5eefa0b902d47a175009667f168cf53d5f5205d5c
Source Schema Version 1.1
Temporal 2018-08-01T00:00:00Z/2022-08-07T00:00:00Z

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