CYGNSS Level 1 Science Data Record Version 3.0

Description

This Level 1 (L1) dataset contains the Version 3.0 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 2.1; https://doi.org/10.5067/CYGNS-L1X21 . 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. Here is a summary of improvements the calibration and processing changes to the Version 3.0 data: 1) the transmitted GPS signal strength in the direction of the DDM scattering surface is determined in real time from measurements of the direct signal from the GPS satellite to the CYGNSS navigation receiver, allowing for the BRCS calibration to be corrected for variations in GPS transmit power; 2) the NBRCS has been validated using comparisons with a large population of modeled values derived from coincident ocean surface roughness spectra produced by the NOAA WAVEWATCH-3 oceanographic wave model; 3) L1 calibration parameters have been adjusted to produce a best fit to the model population.

Resources

Name Format Description Link
5 https://daacdata.apps.nsidc.org/pub/DATASETS/CLP/data/satellite/nsidc0148_hyperion/
21 https://doi.org/10.5067/J5U800GIBU78
5 https://podaac.jpl.nasa.gov%2FCitingPODAAC
5 https://github.com%2Fpodaac%2Fdata-readers
5 https://archive.podaac.earthdata.nasa.gov%2Fpodaac-ops-cumulus-docs%2Fcygnss%2Fopen%2FL1%2Fdocs%2F148-0346-8_L1_v3.0_netCDF_Data_Dictionary.xlsx
5 https://doi.org%2F10.1109%2FTGRS.2015.2502245
5 https://podaac.jpl.nasa.gov%2Fforum%2Fviewtopic.php%3Ff%3D16%26t%3D1261
5 https://archive.podaac.earthdata.nasa.gov%2Fpodaac-ops-cumulus-docs%2Fcygnss%2Fopen%2FL1%2Fdocs%2F148-0136_ATBD_L1A_DDMCalibration_Rev2_Aug2018_release.pdf
5 https://docs.google.com%2Fspreadsheets%2Fd%2F1AFAZanVGDApLSnJQAAdPfOKoJQs0jnB8ZvIuD1Z5mAc%2Fedit%23gid%3D0
5 https://journals.ametsoc.org%2Fdoi%2F10.1175%2FBAMS-D-14-00218.1
5 https://doi.org%2F10.1029%2F2019GL085134
5 https://doi.org%2F10.1175%2FBAMS-D-18-0337.1
5 https://cygnss.engin.umich.edu%2F
5 https://archive.podaac.earthdata.nasa.gov%2Fpodaac-ops-cumulus-docs%2Fcygnss%2Fopen%2FL1%2Fdocs%2F148-0137-3_ATBD_L1B_v3.0_DDMCalibration_Release.pdf
5 https://cygnss.engin.umich.edu%2Fwp-content%2Fuploads%2Fsites%2F534%2F2021%2F06%2FCYGNSS_Handbook_April2016.pdf
5 https://cmr.earthdata.nasa.gov%2Fvirtual-directory%2Fcollections%2FC2205618435-POCLOUD
5 https://search.earthdata.nasa.gov%2Fsearch%2Fgranules%3Fp%3DC2205618435-POCLOUD
5 https://doi.org%2F10.1109%2FTGRS.2021.3070238
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_6.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://podaac.jpl.nasa.gov%2FPodaac%2Fthumbnails%2FCYGNSS_L1_V3.0.jpg
5 https://archive.podaac.earthdata.nasa.gov%2Fpodaac-ops-cumulus-docs%2Fcygnss%2Fopen%2FL1%2Fdocs%2Fatt_tables%2FAttitude_Table_FM_5.txt
5 https://doi.org%2F10.3998%2Fmpub.12741920
5 https://podaac.jpl.nasa.gov/CitingPODAAC
5 https://github.com/podaac/data-readers
53 148-0346-8_L1_v3.0_netCDF_Data_Dictionary.xlsx https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/148-0346-8_L1_v3.0_netCDF_Data_Dictionary.xlsx
21 https://doi.org/10.1109/TGRS.2015.2502245
5 https://podaac.jpl.nasa.gov/forum/viewtopic.php?f=16&t=1261
33 148-0136_ATBD_L1A_DDMCalibration_Rev2_Aug2018_release.pdf https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/148-0136_ATBD_L1A_DDMCalibration_Rev2_Aug2018_release.pdf
5 https://docs.google.com/spreadsheets/d/1AFAZanVGDApLSnJQAAdPfOKoJQs0jnB8ZvIuD1Z5mAc/edit#gid=0
5 https://journals.ametsoc.org/doi/10.1175/BAMS-D-14-00218.1
21 https://doi.org/10.1029/2019GL085134
21 https://doi.org/10.1175/BAMS-D-18-0337.1
5 https://cygnss.engin.umich.edu/
33 148-0137-3_ATBD_L1B_v3.0_DDMCalibration_Release.pdf https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/148-0137-3_ATBD_L1B_v3.0_DDMCalibration_Release.pdf
33 CYGNSS_Handbook_April2016.pdf https://cygnss.engin.umich.edu/wp-content/uploads/sites/534/2021/06/CYGNSS_Handbook_April2016.pdf
5 https://cmr.earthdata.nasa.gov/virtual-directory/collections/C2205618435-POCLOUD
5 https://search.earthdata.nasa.gov/search/granules?p=C2205618435-POCLOUD
21 https://doi.org/10.1109/TGRS.2021.3070238
5 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
5 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
5 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
5 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
5 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
5 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
5 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 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
21 https://doi.org/10.3998/mpub.12741920
22 CYGNSS_L1_V3.0.jpg https://podaac.jpl.nasa.gov/Podaac/thumbnails/CYGNSS_L1_V3.0.jpg
5 148-0346-8_L1_v3.0_netCDF_Data_Dictionary.xlsx https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/148-0346-8_L1_v3.0_netCDF_Data_Dictionary.xlsx
5 https://doi.org/10.1109/TGRS.2015.2502245
5 https://podaac.jpl.nasa.gov/forum/viewtopic.php?f=16&t=1261
5 https://docs.google.com/spreadsheets/d/1AFAZanVGDApLSnJQAAdPfOKoJQs0jnB8ZvIuD1Z5mAc/edit#gid=0
5 https://journals.ametsoc.org/doi/10.1175/BAMS-D-14-00218.1
21 https://doi.org/10.1029/2019GL085134
5 https://doi.org/10.1175/BAMS-D-18-0337.1
5 https://cygnss.engin.umich.edu/
33 CYGNSS_Handbook_April2016.pdf https://cygnss.engin.umich.edu/wp-content/uploads/sites/534/2021/06/CYGNSS_Handbook_April2016.pdf
5 https://cmr.earthdata.nasa.gov/virtual-directory/collections/C2205618435-POCLOUD
5 https://search.earthdata.nasa.gov/search/granules?p=C2205618435-POCLOUD
5 https://doi.org/10.1109/TGRS.2021.3070238
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_7.txt https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/att_tables/Attitude_Table_FM_7.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_L1_V3.0.jpg https://podaac.jpl.nasa.gov/Podaac/thumbnails/CYGNSS_L1_V3.0.jpg
5 https://github.com/podaac/data-readers
33 148-0136_ATBD_L1A_DDMCalibration_Rev2_Aug2018_release.pdf https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/148-0136_ATBD_L1A_DDMCalibration_Rev2_Aug2018_release.pdf
5 https://podaac.jpl.nasa.gov/CitingPODAAC
33 148-0137-3_ATBD_L1B_v3.0_DDMCalibration_Release.pdf https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/148-0137-3_ATBD_L1B_v3.0_DDMCalibration_Release.pdf
0 The metadata's original source. https://cmr.earthdata.nasa.gov/search/concepts/C2205618435-POCLOUD.iso19115

Tags

  • earth-science-radar-spectral-engineering-radar-cross-section-bistatic-radar-cross-section
  • earth-science-radar-spectral-engineering-radar-reflectivity-zenith-signal-power

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