CYGNSS Level 2 Science Data Record Version 2.1

Description

This dataset contains the Version 2.1 CYGNSS Level 2 Science 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. This version supersedes Version 2.0. 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 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) revised Geophysical Model Functions (GMFs) for both Fully Developed Seas (FDS) and Young Seas with Limited Fetch conditions, to be consistent with the calibration changes made to the v2.1 Level 1 science data products.; 2) Revised covariance matrix between DDMA and LES versions of the FDS wind speed retrieval, used by the minimum variance estimator, resulting from changes made to the v2.1 Level 1 science data products; 3) Revised debiasing algorithm coefficients used by the FDS L2 retrieval algorithm, resulting from changes made to the v2.1 Level 2 science data products; 4) revised quality control (Q/C) flags related to the required level of consistency between DDMA and LES versions of the FDS wind speed retrieval (the errors in the two retrievals are now less correlated so larger discrepancies are allowed; if either retrieval is not available, the sample receives a fatal Q/C flag); 5) new Q/C flag related to the block type of the GPS satellite which provided the transmitted signal. Samples using block II-F signals receive a fatal Q/C flag due to the higher level of uncertainty in their radiated power; 6) revised wind speed uncertainty values as a function of RCG and wind speed, plus a new dependence of the uncertainty on GPS block type to reflect the higher uncertainty in GPS radiated power for block II-F satellites.

Resources

Name Format Description Link
47 Attitude_Table_FM_7.txt https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/att_tables/Attitude_Table_FM_7.txt
5 https://podaac.jpl.nasa.gov%2FCitingPODAAC
5 https://doi.org%2F10.1175%2FBAMS-D-14-00218.1
5 https://archive.podaac.earthdata.nasa.gov%2Fpodaac-ops-cumulus-docs%2Fcygnss%2Fopen%2FL2%2Fdocs%2F148-0348-9_L2_v2.1_netCDF_Data_Dictionary.xlsx
5 https://docs.google.com%2Fspreadsheets%2Fd%2F1AFAZanVGDApLSnJQAAdPfOKoJQs0jnB8ZvIuD1Z5mAc%2Fedit%23gid%3D0
5 https://cygnss.engin.umich.edu%2Fwp-content%2Fuploads%2Fsites%2F534%2F2021%2F06%2FCYGNSS_Handbook_April2016.pdf
5 https://doi.org%2F10.1109%2FJSTARS.2018.2833075
5 https://archive.podaac.earthdata.nasa.gov%2Fpodaac-ops-cumulus-docs%2Fcygnss%2Fopen%2FL2%2Fdocs%2F148-0138_ATBD_L2_Wind_Speed_Retrieval_Rev5_Aug2018_release.pdf
5 https://archive.podaac.earthdata.nasa.gov%2Fpodaac-ops-cumulus-docs%2Fcygnss%2Fopen%2FL2%2Fdocs%2F148-0139-L2-MSS-ATBD-R3.pdf
5 https://doi.org%2F10.1175%2FJTECH-D-20-0079.1
5 https://doi.org%2F10.1175%2FBAMS-D-18-0337.1
5 https://doi.org%2F10.1109%2FTGRS.2016.2541343
5 https://github.com%2Fpodaac%2Fdata-readers
5 https://cygnss.engin.umich.edu%2F
5 https://cmr.earthdata.nasa.gov%2Fvirtual-directory%2Fcollections%2FC2251464495-POCLOUD
5 https://search.earthdata.nasa.gov%2Fsearch%2Fgranules%3Fp%3DC2251464495-POCLOUD
5 https://podaac.jpl.nasa.gov%2FOPeNDAP-in-the-Cloud
5 https://archive.podaac.earthdata.nasa.gov%2Fpodaac-ops-cumulus-docs%2Fcygnss%2Fopen%2FL1%2Fdocs%2Fatt_tables%2FAttitude_Table_FM_1.txt
5 https://archive.podaac.earthdata.nasa.gov%2Fpodaac-ops-cumulus-docs%2Fcygnss%2Fopen%2FL1%2Fdocs%2Fatt_tables%2FAttitude_Table_FM_2.txt
5 https://archive.podaac.earthdata.nasa.gov%2Fpodaac-ops-cumulus-docs%2Fcygnss%2Fopen%2FL1%2Fdocs%2Fatt_tables%2FAttitude_Table_FM_3.txt
5 https://archive.podaac.earthdata.nasa.gov%2Fpodaac-ops-cumulus-docs%2Fcygnss%2Fopen%2FL1%2Fdocs%2Fatt_tables%2FAttitude_Table_FM_4.txt
5 https://archive.podaac.earthdata.nasa.gov%2Fpodaac-ops-cumulus-docs%2Fcygnss%2Fopen%2FL1%2Fdocs%2Fatt_tables%2FAttitude_Table_FM_5.txt
5 https://archive.podaac.earthdata.nasa.gov%2Fpodaac-ops-cumulus-docs%2Fcygnss%2Fopen%2FL1%2Fdocs%2Fatt_tables%2FAttitude_Table_FM_7.txt
5 https://archive.podaac.earthdata.nasa.gov%2Fpodaac-ops-cumulus-docs%2Fcygnss%2Fopen%2FL1%2Fdocs%2Fatt_tables%2FAttitude_Table_FM_8.txt
5 https://doi.org%2F10.3998%2Fmpub.12741920
5 https://podaac.jpl.nasa.gov%2FPodaac%2Fthumbnails%2FCYGNSS_L2_V2.1.jpg
5 https://archive.podaac.earthdata.nasa.gov%2Fpodaac-ops-cumulus-docs%2Fcygnss%2Fopen%2FL1%2Fdocs%2Fatt_tables%2FAttitude_Table_FM_6.txt
5 https://podaac.jpl.nasa.gov/CitingPODAAC
5 https://doi.org/10.1175/BAMS-D-14-00218.1
5 https://docs.google.com/spreadsheets/d/1AFAZanVGDApLSnJQAAdPfOKoJQs0jnB8ZvIuD1Z5mAc/edit#gid=0
5 https://doi.org/10.1109/JSTARS.2018.2833075
33 148-0139-L2-MSS-ATBD-R3.pdf https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L2/docs/148-0139-L2-MSS-ATBD-R3.pdf
5 https://doi.org/10.1175/JTECH-D-20-0079.1
33 CYGNSS_Handbook_April2016.pdf https://cygnss.engin.umich.edu/wp-content/uploads/sites/534/2021/06/CYGNSS_Handbook_April2016.pdf
5 148-0348-9_L2_v2.1_netCDF_Data_Dictionary.xlsx https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L2/docs/148-0348-9_L2_v2.1_netCDF_Data_Dictionary.xlsx
33 148-0138_ATBD_L2_Wind_Speed_Retrieval_Rev5_Aug2018_release.pdf https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L2/docs/148-0138_ATBD_L2_Wind_Speed_Retrieval_Rev5_Aug2018_release.pdf
5 https://doi.org/10.1175/BAMS-D-18-0337.1
5 https://doi.org/10.1109/TGRS.2016.2541343
5 https://github.com/podaac/data-readers
5 https://cygnss.engin.umich.edu/
5 https://cmr.earthdata.nasa.gov/virtual-directory/collections/C2251464495-POCLOUD
5 https://search.earthdata.nasa.gov/search/granules?p=C2251464495-POCLOUD
5 https://podaac.jpl.nasa.gov/OPeNDAP-in-the-Cloud
47 Attitude_Table_FM_1.txt https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/att_tables/Attitude_Table_FM_1.txt
47 Attitude_Table_FM_2.txt https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/att_tables/Attitude_Table_FM_2.txt
47 Attitude_Table_FM_3.txt https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/att_tables/Attitude_Table_FM_3.txt
47 Attitude_Table_FM_4.txt https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/att_tables/Attitude_Table_FM_4.txt
47 Attitude_Table_FM_5.txt https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/att_tables/Attitude_Table_FM_5.txt
47 Attitude_Table_FM_6.txt https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/att_tables/Attitude_Table_FM_6.txt
47 Attitude_Table_FM_8.txt https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/att_tables/Attitude_Table_FM_8.txt
5 https://doi.org/10.3998/mpub.12741920
22 CYGNSS_L2_V2.1.jpg https://podaac.jpl.nasa.gov/Podaac/thumbnails/CYGNSS_L2_V2.1.jpg
0 The metadata's original source. https://cmr.earthdata.nasa.gov/search/concepts/C2251464495-POCLOUD.iso19115

Tags

  • earth-science-ocean-winds-oceans-surface-winds-ocean-surface-wind-speed
  • earth-science-ocean-winds-oceans-surface-winds
  • earth-science-radar-spectral-engineering-radar-cross-section-bistatic-radar-cross-section
  • earth-science-radar-spectral-engineering-sigma-naught

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