CYGNSS Level 3 Science Data Record Version 2.1

(CYGNSS_L3_V2.1)

Information
Coverage
Data Access
Documentation
Citation
Version History

Version	2.1
Processing Level	3
Start/Stop Date	2017-Mar-18 to Present
Short Name	CYGNSS_L3_V2.1
Description	This dataset contains the Version 2.1 CYGNSS Level 3 Science Data Record which provides the average wind speed and mean square slope (MSS) on a 0.2x0.2 degree latitude by longitude equirectangular grid obtained from the Delay Doppler Mapping Instrument aboard the CYGNSS satellite constellation. The Level 2 Delay Doppler Map (DDM) data are used in the direct processing of the average wind speed and MSS data that are binned on the Level 3 grid. 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. A single netCDF-4 data file is produced for each day of operation with an approximate 6 day latency. This version supersedes Version 2.0. The reported sample locations are determined by the specular points corresponding to the Delay Doppler Maps (DDMs). 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) first time availability of wind speeds using the Geophysical Model Function (GMF) calibrated for Young Seas with Limited Fetch (YSLF) conditions; 2) inherits all other improvements made to the version 2.1 Level 2 data intended to improve the quality of the wind speed retrievals and uncertainty estimates. For a full list of improvements to the version 2.1 Level 2 data, please refer to the following dataset information page: https://podaac.jpl.nasa.gov/dataset/CYGNSS_L2_V2.1
DOI	10.5067/CYGNS-L3X21
Measurement	OCEANS > OCEAN WINDS > SURFACE WINDS OCEANS > OCEAN WINDS > SURFACE WINDS
Platform/Sensor	CYGNSS Platform Name: Cyclone Global Navigation Satellite System (CYGNSS) Orbit Period: 94.0 minutes Inclination Angle: 35.0 degrees / DDMI SENSOR Name: Delay Doppler Mapping Instrument (DDMI) Swath Width: 25.0 kilometers Description: Spacecraft angular distance from orbital plane relative to the Equator.
Project	Cyclone Global Navigation Satellite System (CYGNSS)
Data Provider	Publisher: PO.DAAC Creator: CYGNSS Release Place: PO.DAAC Release Date: 2018-Sep-21 Resource: https://cygnss.engin.umich.edu/
Format	netCDF-4
Keyword(s)	cygnss, ddm, ddmi, doppler, delay doppler, delay, specular point, wind, winds, wind speed, version 2.1, v2.1

Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov

Resolution Spatial Resolution: 0.2 Decimal Degrees x 0.2 Decimal Degrees Temporal Resolution: Hourly - < Daily Coverage Region: GLOBAL North Bounding Coordinate: 40 degrees South Bounding Coordinate: -40 degrees West Bounding Coordinate: -180 degrees East Bounding Coordinate: 180 degrees Time Span: 2017-Mar-18 to Present Granule Time Span: 2017-Mar-18 to 2023-Mar-18 Projection Projection Type: Cylindrical Lat-Lon Projection Detail: Geolocation information included for each pixel Ellipsoid: WGS 84

DIRECT ACCESS
Browse Granule Listing
https://cmr.earthdata.nasa.gov/virtual-directory/collections/C2251464847-POCLOUD
OPENDAP DATA
https://podaac.jpl.nasa.gov/OPeNDAP-in-the-Cloud
Search Granules
https://search.earthdata.nasa.gov/search/granules?p=C2251464847-POCLOUD
DIRECT S3-ACCESS
Available for access in-region with AWS Cloud
Region
us-west-2
Bucket/Object Prefix: Protected buckets contain the data files for a given collection. Protected simply means users must log in to Earthdata Login before gaining access to contents within that S3 Bucket. Please use the S3Credential endpoint to gain an Earthdata login token for use in S3 Access. Public buckets, in contrast, house metadata such as checksums, imagery, and metadata files and the like. A user can access public buckets and these types of files without logging in to Earthdata Login. Most of the time, you'll want to access the protected bucket Information
podaac-ops-cumulus-protected/CYGNSS_L3_V2.1/
podaac-ops-cumulus-public/CYGNSS_L3_V2.1/
AWS S3 Credentials
Get AWS S3 Credentials \| Documentation
TOOLS AND SERVICES
EOSDIS Worldview

USER'S GUIDE
https://cygnss.engin.umich.edu/wp-content/uploads/sites/534/2021/06/CYGNSS_Handbook_April2016.pdf Deriving Surface Winds from Tropical Cyclones
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L3/docs/148-0351-2_L3_v2.1_netCDF_Data_Dictionary.xlsx Look-up table to define the Level 3 data variables
https://doi.org/10.3998/mpub.12741920 CYGNSS Handbook
PUBLICATIONS
https://doi.org/10.1175/BAMS-D-18-0337.1 Ruf, C., S. Asharaf, R. Balasubramaniam, S. Gleason, T. Lang, D. McKague, D. Twigg, and D. Waliser. (2019). In-Orbit Performance of the Constellation of CYGNSS Hurricane Satellites. Bull. Amer. Meteor. Soc., 100, 2009 - 2023, https://doi.org/10.1175/BAMS-D-18-0337.1.
https://doi.org/10.1175/BAMS-D-14-00218.1 Ruf, C., R. Atlas, P. Chang, M. Clarizia, J. Garrison, S. Gleason, S. Katzberg, Z. Jelenak, J. Johnson, S. Majumdar, A. O'Brien, D. Posselt, A. Ridley, R. Rose, V. Zavorotny (2015). New Ocean Winds Satellite Mission to Probe Hurricanes and Tropical Convection. Bull. Amer. Meteor. Soc., doi:10.1175/BAMS-D-14-00218.1.
https://doi.org/10.1175/JTECH-D-20-0079.1 Asharaf, S., Waliser, D. E., Posselt, D. J., Ruf, C. S., Zhang, C., & Putra, A. W. (2021). CYGNSS Ocean Surface Wind Validation in the Tropics, Journal of Atmospheric and Oceanic Technology, 38(4), 711-724. https://doi.org/10.1175/JTECH-D-20-0079.1
ANOMALIES
https://docs.google.com/spreadsheets/d/1AFAZanVGDApLSnJQAAdPfOKoJQs0jnB8ZvIuD1Z5mAc/edit#gid=0 Google Sheet Log of Anomalous CYGNSS Sampling Events
GENERAL DOCUMENTATION
https://cygnss.engin.umich.edu/ CYGNSS Mission Page at University of Michigan
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/att_tables/Attitude_Table_FM_1.txt Updated Monthly
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/att_tables/Attitude_Table_FM_2.txt Updated Monthly
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/att_tables/Attitude_Table_FM_3.txt Updated Monthly
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/att_tables/Attitude_Table_FM_4.txt Updated Monthly
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/att_tables/Attitude_Table_FM_5.txt Updated Monthly
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/att_tables/Attitude_Table_FM_6.txt Updated Monthly
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/att_tables/Attitude_Table_FM_7.txt Updated Monthly
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/att_tables/Attitude_Table_FM_8.txt Updated Monthly
DATA RECIPE
https://github.com/podaac/data-readers Generic Data Readers
ALGORITHM THEORETICAL BASIS DOCUMENT (ATBD)
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L3/docs/148-0319_ATBD_L3_Gridded_Wind_Speed_Rev1_Aug2018_release.pdf Level 3 Gridded Wind Speed Algorithm Theoretical Basis Document, C. Ruf, CYGNSS Project Document 148-0319, Rev 1, 20 Aug. 2018.
DATA CITATION POLICY
https://podaac.jpl.nasa.gov/CitingPODAAC Data Use and Citation Policy
PI DOCUMENTATION
https://doi.org/10.3998/mpub.12741920 CYGNSS Handbook

Citation is critically important for dataset documentation and discovery. Please cite the data as follows, and cite the reference papers when it is appropriate.

Citation

CYGNSS. 2018. CYGNSS Level 3 Science Data Record Version 2.1. Ver. 2.1. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/CYGNS-L3X21

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For more information see Data Citations and Acknowledgments.

Journal Reference

Asharaf, S., Waliser, D. E., Posselt, D. J., Ruf, C. S., Zhang, C., & Putra, A. W.. 2021. CYGNSS Ocean Surface Wind Validation in the Tropics, Journal of Atmospheric and Oceanic Technology, 38, 4. https://doi.org/10.1175/JTECH-D-20-0079.1

Version	Dataset	Version Date	Status
2.1	CYGNSS Level 3 Science Data Record Version 2.1	2018-05-14	ACTIVE	2018-05-14T22:44:23.442Z
3.0	CYGNSS Level 3 Science Data Record Version 3.0	2019-12-09	ACTIVE	2019-12-09T20:27:58.333Z
2.0	CYGNSS Level 3 Science Data Record Version 2.0	2017-10-27	RETIRED	1509074873613
1.1	CYGNSS Level 3 Science Data Record Version 1.1	2017-06-09	RETIRED	1496969292658
1.0	CYGNSS Level 3 Science Data Record Version 1.0	2017-01-10	RETIRED	1484019011247

Cloud Enabled

Status:

ACTIVE

Short Name:

CYGNSS_L3_V2.1

Collection Concept ID:

C2251464847-POCLOUD

Spatial Coverage:

N: 40°

S: -40°

E: 180°

W: -180°

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Data Recipes:

Generic Data Readers

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CYGNSS Level 3 Science Data Record Version 2.1

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