CYGNSS Level 3 Science Data Record Version 3.0
(CYGNSS_L3_V3.0)| Version | 3.0 |
| Processing Level | 3 |
| Start/Stop Date | 2018-Aug-01 to Present |
| Short Name | CYGNSS_L3_V3.0 |
| Description | This dataset contains the Version 3.0 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 2.1; https://doi.org/10.5067/CYGNS-L3X21. The reported sample locations are determined by the specular points corresponding to the Delay Doppler Maps (DDMs). The Version 3.0 release inherits all improvements made to the version 3.0 Level 2 data intended to improve the quality of the wind speed retrievals. For a full list of improvements to the version 3.0 Level 2 data, please refer to: https://doi.org/10.5067/CYGNS-L2X30. |
| DOI | 10.5067/CYGNS-L3X30 |
| 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: 2020-Oct-28 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 3.0, v3.0 |
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: 2018-Aug-01 to Present Granule Time Span: 2018-Aug-01 to 2022-Aug-06 Projection Ellipsoid: WGS 84 |
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| Available for access in-region with AWS Cloud | |
Region | |
| us-west-2 | |
| podaac-ops-cumulus-protected/CYGNSS_L3_V3.0/ | |
| podaac-ops-cumulus-public/CYGNSS_L3_V3.0/ | |
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| Name | Long Name | Unit |
|---|---|---|
| epoch_time | Time Centering of Data Based on Epoch Reference | hours since 2018-08-01 00:30:00.000000000 |
| 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 2018-08-02 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 |
| USER'S GUIDE | |
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| ANOMALIES | |
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| GENERAL DOCUMENTATION | |
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| ALGORITHM THEORETICAL BASIS DOCUMENT (ATBD) | |
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| DATA RECIPE | |
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| DATA CITATION POLICY | |
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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. 2020. CYGNSS Level 3 Science Data Record Version 3.0. Ver. 3.0. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/CYGNS-L3X30
For more information see Data Citations and Acknowledgments.
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| Journal Reference | Ruf, C.S., Chew, C., Lang, T., Morris, M.G., Nave, K., Ridley, A., and Balasubramaniam R.. 2018. A New Paradigm in Earth Environmental Monitoring with the CYGNSS Small Satellite Constellation, Scientific Reports, 8, 8782. https://doi.org/10.1038/s41598-018-27127-4 Wang, T., Ruf, C. S., Gleason, S., O’Brien, A. J., McKague, D. S., Block, B. P., and Russel, A.. 2021. Dynamic Calibration of GPS Effective Isotropic Radiated Power for GNSS-Reflectometry Earth Remote Sensing, IEEE Trans. Geosci. Remote Sens., 60. https://doi.org/10.1109/TGRS.2021.3070238 |
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| Version | Dataset | Version Date | Status | |
|---|---|---|---|---|
| 3.1 | CYGNSS Level 3 Science Data Record Version 3.1 Controlled | Present | ACTIVE | |
| 3.0 | CYGNSS Level 3 Science Data Record Version 3.0 | 2022-04-18 | ACTIVE | 2022-04-18T18:28:00.000Z |
| 3.0 | CYGNSS Level 3 Science Data Record Version 3.0 Quarantined | Present | COMPLETE | |
| 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. | |