CYGNSS Level 1 Science Data Record Version 2.1
5 Publications Cited this Dataset
Citation metrics available for years (2015-2019)
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Publications citing CYGNSS Level 1 Science Data Record Version 2.1
Citation metrics available for years (2015-2019)
| Year | Citation |
|---|---|
| 2018 | Lake Level and Surface Topography Measured With Spaceborne GNSS‐Reflectometry From CYGNSS Mission: Example for the Lake Qinghai, Geophysical Research Letters,https://doi.org/10.1029/2018GL080976 |
| 2019 | Evaluation of Spaceborne GNSS-R Retrieved Ocean Surface Wind Speed with Multiple Datasets, Remote Sensing,https://doi.org/10.3390/rs11232747 |
| 2019 | CYGNSS, 2018, CYGNSS Level 1 Science Data Record Version 2.1. Ver. 2.1. PO.DAAC, CA, USA. Dataset accessed [2019-04-01] at https://doi.org/10.5067/CYGNS-L1X21. Soil Moisture Retrieval in Southeast China from Spaceborne GNSS-R Measurements, 2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall),https://doi.org/10.1109/PIERS-Fall48861.2019.9021558 |
| 2019 | A CYGNSS‐based algorithm for the detection of inland waterbodies, Geophysical Research Letters,https://doi.org/10.1029/2019GL085134 |
| 2019 | CYGNSS, 2018. CYGNSS Level 1 Science Data Record Version 2.1. Ver. 2.1. PO.DAAC, CA, USA. Dataset accessed at. https://doi.org/10.5067/CYGNS-L1X21. A novel approach to monitoring wetland dynamics using CYGNSS: Everglades case study, Remote Sensing of Environment,https://doi.org/10.1016/j.rse.2019.111417 |
| DOI | 10.5067/CYGNS-L1X21 |
| Short Name | CYGNSS_L1_V2.1 |
| Description | This Level 1 (L1) dataset contains the Version 2.1 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 2.0. 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. 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) data is now available when the CYGNSS satellites are rolled away from nadir during orbital high beta-angle periods, resulting in a significant amount of additional data; 2) correction to coordinate frames result in more accurate estimates of receiver antenna gain at the specular point; 3) improved calibration for analog-to-digital conversion results in better consistency between CYGNSS satellites measurements at nearly the same location and time; 4) improved GPS EIRP and transmit antenna pattern calibration results in significantly reduced PRN-dependence in the observables; 5) improved estimation of the location of the specular point within the DDM; 6) an altitude-dependent scattering area is used to normalize the scattering cross section (v2.0 used a simpler scattering area model that varied with incidence and azimuth angles but not altitude); 7) corrections added for noise floor-dependent biases in scattering cross section and leading edge slope of delay waveform observed in the v2.0 data. Users should also note that the receiver antenna pattern calibration is not applied per-DDM-bin in this v2.1 release. |
| Version | 2.1 |
| Dataset Type | ACTIVE |
| Measurement | SPECTRAL/ENGINEERING > RADAR > RADAR CROSS-SECTION SPECTRAL/ENGINEERING > RADAR > RADAR REFLECTIVITY |
| Processing Level | 1 |
| 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 2021-Apr-17 |
| Resolution | Spatial Resolution: 25 km (Along) x 25 km (Across) |
| Projection | Ellipsoid: WGS 84 |
| Swath Width | 25 km |
| 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: http://clasp-research.engin.umich.edu/missions/cygnss/ |
| Keyword(s) | cygnss, ddm, ddmi, ddma, doppler, delay doppler, delay, specular point, waveform, les, leading edge slope, bistatic, bi-static, radar, brcs, sigma0, sigma-0, sigma naught, sigma-naught, nbrcs, wind, winds, wind speed, version 2.1, v2.1 |
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
| Direct Access | |
| PO.DAAC DRIVE | https://podaac-tools.jpl.nasa.gov/drive/files/allData/cygnss/L1/v2.1 PO.DAAC Drive |
| OPENDAP DATA | https://podaac-opendap.jpl.nasa.gov/opendap/allData/cygnss/L1/v2.1/ The OPeNDAP base directory location for the collection. |
| Format (Compression) | NETCDF |
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| Citation | CYGNSS. 2018. CYGNSS Level 1 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-L1X21
For more information see Data Citations and Acknowledgments.
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| Journal Reference | 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. | |||||||
| Version | Dataset | Version Date | Status | |
|---|---|---|---|---|
| 3.0 | CYGNSS Level 1 Science Data Record Version 3.0 | 2020-09-22 | ACTIVE | 1600795537880 |
| 2.1 | CYGNSS Level 1 Science Data Record Version 2.1 | 2018-05-14 | ACTIVE | 1526337699835 |
| 2.0 | CYGNSS Level 1 Science Data Record Version 2.0 | 2017-10-27 | RETIRED | 1509074435972 |
| 1.1 | CYGNSS Level 1 Science Data Record Version 1.1 | 2017-06-09 | RETIRED | 1496966737388 |
| 1.0 | CYGNSS Level 1 Science Data Record Version 1.0 | 2016-03-17 | RETIRED | 1458253007782 |