CYGNSS Level 2 Climate Data Record Version 1.1
(CYGNSS_L2_CDR_V1.1)
3 Publications Cited this Dataset
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Publications citing CYGNSS Level 2 Climate Data Record Version 1.1
Citation metrics available for years (2014-2022)
| Year | Citation |
|---|---|
| 2021 | CYGNSS, 2021. CYGNSS Level 2 Climate Data Record Version 1.1. Ver. 1.1. PO.DAAC. https://doi.org/10.5067/CYGNS-L2C11 (accessed: 2021-03-08). Analysis of coastal wind speed retrieval from CYGNSS mission using artificial neural network, Journal ,10.1016/j.rse.2021.112454 |
| 2021 | CYGNSS, CYGNSS Level 2 Climate Data Record Version 1.1, NASA Physical Oceanography DAAC. 2020. Available online: https://podaac.jpl.nasa.gov/dataset/CYGNSS_L2_CDR_V1.1 (accessed on 8 November 2021) Assessment of CYGNSS Wind Speed Retrievals in Tropical Cyclones, Journal ,10.3390/rs13245110 |
| 2022 | Exploring CYGNSS mission for surface heat flux estimates and analysis over tropical oceans, Frontiers in Marine Science ,10.3389/fmars.2022.1001491 |
| Version | 1.1 |
| Processing Level | 2 |
| Start/Stop Date | 2018-Aug-01 to Present |
| Short Name | CYGNSS_L2_CDR_V1.1 |
| Description | This dataset contains the Version 1.1 CYGNSS Level 2 Climate Data Record which provides the time-tagged and geolocated average wind speed (m/s) and mean square slope (MSS) with 25x25 kilometer resolution from the Delay Doppler Mapping Instrument aboard the CYGNSS satellite constellation. The reported sample locations are determined by the specular points corresponding to the Delay Doppler Maps (DDMs). 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. Only one netCDF data file is produced each day (each file containing data from up to 8 unique CYGNSS spacecraft) with a latency of approximately 1 to 2 months from the last recorded measurement time. The Version 1.1 CDR represents is a collection of reanalysis products derived from the SDR v3.0 Level 1 data (https://doi.org/10.5067/CYGNS-L1X30 ). Calibration accuracy and long term stability are improved relative to SDR v3.0 (https://doi.org/10.5067/CYGNS-L2X30 ) using the same trackwise correction algorithm as was used by CDR v1.0 (https://doi.org/10.5067/CYGNS-L2C10 ), which was derived from SDR v2.1 Level 1 data (https://doi.org/10.5067/CYGNS-L1X21 ). Details of the algorithm are provided in the Trackwise Corrected CDR Algorithm Theoretical Basis Document. CDR Level 2 and 3 products (ocean surface wind speed, mean square slope, and latent and sensible heat flux) are generated from the CDR L1 data using the v3.0 SDR data processing algorithms. These products also exhibit improved calibration accuracy and stability over SDR v3.0. Trackwise correction is applied to the two primary CYGNSS L1 science data products, the normalized bistatic radar cross section (NBRCS) and the leading edge slope of the Doppler-integrated delay waveform (LES). The correction compensates for small errors in the Level 1 calibration, due e.g. to uncertainties in the GPS transmitting antenna gain patterns and the CYGNSS receiving antenna gain patterns. CDR v1.1 does not include a Young Seas with Limited Fetch (YSLF) wind speed product and investigators requiring wind speed measurements in and near the inner core of tropical cyclones should use the SDR v3.0 YSLF wind speed product. A YSLF wind speed product is omitted because the trackwise correction algorithm, which constrains the average value of the L1 data using MERRA-2 reanalysis wind speeds, is inherently biased toward fully developed sea state conditions. The constraint improves wind speed retrieval performance in fully developed seas but produces underestimates in YSLF conditions. It should also be noted that the trackwise correction algorithm cannot be successfully applied to all SDR v3.0 L1 data so there is also some loss of samples that were present in SDR v3.0. |
| DOI | 10.5067/CYGNS-L2C11 |
| Measurement | OCEANS > OCEAN WINDS > SURFACE WINDS OCEANS > OCEAN WINDS > SURFACE WINDS |
| 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: 2021-Feb-05 Resource: https://cygnss.engin.umich.edu/ |
| Format | netCDF-4 |
| Keyword(s) | cygnss, ddm, ddmi, doppler, delay doppler, delay, specular point, wind, winds, wind speed, cdr, climate data record, climate, version 1.1, v1.1 |
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
Resolution Spatial Resolution: 25000 Meters x 25000 Meters 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-Feb-28Swath Width: 25 km Projection Projection Type: Satellite native along-track Projection Detail: Geolocation information included for each pixel Ellipsoid: WGS 84 |
| DIRECT ACCESS | |
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| Available for access in-region with AWS Cloud | |
Region | |
| us-west-2 | |
| podaac-ops-cumulus-protected/CYGNSS_L2_CDR_V1.1/ | |
| podaac-ops-cumulus-public/CYGNSS_L2_CDR_V1.1/ | |
AWS S3 Credentials | |
| Get AWS S3 Credentials | Documentation | |
| Name | Long Name | Unit |
|---|---|---|
| antenna | Receive antenna | 1 |
| averaged_l1 | Maximum number of time-averaged L1-samples occuring in the same second | 1 |
| azimuth_angle | Azimuth angle | degree |
| commanded_sc_roll | Commanded spacecraft attitude roll angle | radian |
| ddm | Maximum number of time-averaged DDMs | 1 |
| ddm_averaged_l1_utilized_flag | DDM Average L1 utilized flags | 1 |
| ddm_channel | Level 1 DDM reflectometry channels | 1 |
| ddm_les | DDM leading edge slope observables | 1 |
| ddm_nbrcs | DDM normalized bistatic radar cross section observables | 1 |
| ddm_num_averaged_l1 | Number of valid L1 samples averaged | 1 |
| ddm_obs_utilized_flag | DDM-utilized flags | 1 |
| ddm_sample_index | Level 1 netCDF sample indices | 1 |
| ddm_source | Level 0 data source | 1 |
| fds_les_wind_speed | Fully Developed Seas retrieval of wind speed from LES | m s-1 |
| fds_nbrcs_wind_speed | Fully Developed Sea retrieval of wind speed from NBRCS | m s-1 |
| fds_sample_flags | Sample status flags for Fully Developed Seas wind speed retreval | |
| fresnel_coeff | Fresnel power reflection coefficient | 1 |
| incidence_angle | Incidence angle | degree |
| lat | Latitude | degrees_north |
| les_mean | LES mean | 1 |
| lon | Longitude | degrees_east |
| mean_square_slope | Mean square slope | 1 |
| mean_square_slope_uncertainty | Mean square slope uncertainty | 1 |
| merra2_wind_speed | MERRA-2 reference wind speed | m s-1 |
| nbrcs_mean | NBRCS mean | 1 |
| num_ddms_utilized | Number of DDM utilized | 1 |
| prn_code | GPS PRN code | 1 |
| range_corr_gain | Range corrected gain | 1e-27 dBi meter-4 |
| sample | Sample index | 1 |
| sample_flags | General status flags for the sample | |
| sample_time | Sample time | seconds since 2018-08-10 00:00:00.999261469 |
| sc_alt | Spacecraft altitude | meter |
| sc_lat | Subsatellite point latitude | degrees_north |
| sc_lon | Subsatellite point longitude | degrees_east |
| sc_roll | Spacecraft attitude roll angle | radian |
| spacecraft_id | CCSDS spacecraft identifier | 1 |
| spacecraft_num | CYGNSS spacecraft number | 1 |
| sum_neg_brcs_value_used_for_nbrcs_flags | Sum of negative BRCS values used for NBRCS flags | 1 |
| sv_num | GPS space vehicle number | 1 |
| wind_speed | Retrieved wind speed using Minimum Variance estimator applied to Fully Developed Seas retrievals from NBRCS and LES | m s-1 |
| wind_speed_uncertainty | Uncertainty in MV FDS wind speed | m s-1 |
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. 2021. CYGNSS Level 2 Climate Data Record Version 1.1. Ver. 1.1. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/CYGNS-L2C11
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. https://doi.org/10.1038/s41598-018-27127-4 |
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| Version | Dataset | Version Date | Status | |
|---|---|---|---|---|
| 3.2 | CYGNSS Level 2 Climate Data Record Version 3.2 | 2024-04-10 | ACTIVE | 2024-04-10T19:38:00.000Z |
| 1.2 | CYGNSS Level 2 Climate Data Record Version 1.2 | 2022-05-19 | ACTIVE | 2022-05-19T21:14:00.000Z |
| 1.1 | CYGNSS Level 2 Climate Data Record Version 1.1 | 2022-04-05 | ACTIVE | 2022-04-05T14:45:00.000Z |
| 1.0 | CYGNSS Level 2 Climate Data Record Version 1.0 | 2021-10-18 | COMPLETE | 2021-10-18T18:51:00.000Z |