CYGNSS Level 3 Science Data Record Version 2.1
(CYGNSS_L3_V2.1)| 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 Region: TROPICS 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 2026-Jan-17 Projection Projection Type: Cylindrical Lat-Lon Projection Detail: Geolocation information included for each pixel Ellipsoid: WGS 84 |
| DIRECT ACCESS | |
| Browse Granule Listing | |
| OPENDAP DATA | |
| Search Granules | |
| This dataset can be downloaded using the podaac-data-subscriber (the recommended tool for bulk downloading PO.DAAC data). It is a Python package for downloading one or many files using the command line interface. The URL redirects to the data-subscriber home page with instructions for utilizing the tool | |
| DIRECT S3-ACCESS | |
| Available for access in-region with AWS Cloud | |
Region | |
| us-west-2 | |
| podaac-ops-cumulus-protected/CYGNSS_L3_V2.1/ | |
| podaac-ops-cumulus-public/CYGNSS_L3_V2.1/ | |
AWS S3 Credentials | |
| Get AWS S3 Credentials | Documentation | |
| Name | Long Name | Unit |
|---|---|---|
| lat | Latitude | degrees_north |
| lon | Longitude | degrees_east |
| mean_square_slope | Mean square slope | 1 |
| mean_square_slope_uncertainty | Mean square slope uncertainty | 1 |
| num_mss_samples | Number of mean square slope samples | 1 |
| num_wind_speed_samples | Number of wind speed samples | 1 |
| num_yslf_wind_speed_samples | Number of young sea limited fetch wind speed samples | 1 |
| time | Reference time of file | hours since 2017-03-22 00:30:00.000000000 |
| wind_speed | Wind speed | m s-1 |
| wind_speed_uncertainty | Wind speed uncertainty | m s-1 |
| yslf_wind_speed | Young sea limited fetch wind speed | m s-1 |
| yslf_wind_speed_uncertainty | Young sea limited fetch wind speed uncertainty | m s-1 |
| DATA CITATION GUIDELINES | |
| |
| USER'S GUIDE | |
| |
| |
| |
| PUBLICATIONS | |
| |
| |
| |
| ANOMALIES | |
| |
| GENERAL DOCUMENTATION | |
| |
| DATA RECIPE | |
| |
| ALGORITHM THEORETICAL BASIS DOCUMENT (ATBD) | |
| |
| PI DOCUMENTATION | |
|
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
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 | |
|---|---|---|---|---|
| 3.0 | CYGNSS Level 3 Science Data Record Version 3.0 Quarantined | Present | COMPLETE | |
| 3.0 | CYGNSS Level 3 Science Data Record Version 3.0 | 2022-04-18 | ACTIVE | 2022-04-18T18:28:00.000Z |
| 2.1 | CYGNSS Level 3 Science Data Record Version 2.1 | 2022-05-09 | ACTIVE | 2022-05-09T18:52:00.000Z |
| 2.0 | CYGNSS Level 3 Science Data Record Version 2.0 | Present | RETIRED. | |
| 1.1 | CYGNSS Level 3 Science Data Record Version 1.1 | Present | RETIRED. | |
| 1.0 | CYGNSS Level 3 Science Data Record Version 1.0 | Present | RETIRED. | |