CYGNSS Level 3 Soil Moisture Version 3.2

(CYGNSS_L3_SOIL_MOISTURE_V3.2)
Version3.2
Processing Level3
Start/Stop Date2017-Mar-18 to Present
Short NameCYGNSS_L3_SOIL_MOISTURE_V3.2
DescriptionThe CYGNSS Level 3 Soil Moisture V3.2 dataset is produced by CYGNSS investigators at the University Corporation for Atmospheric Research (UCAR) and the University Colorado at Boulder (CU), it provides volumetric water content estimates for soils between 0-5 cm depth at a 6-hour discretization for most of the subtropics. and is derived from version 3.2 of the CYGNSS L1 SDR dataset (https://doi.org/10.5067/CYGNS-L1X32). CYGNSS was launched on 15 December 2016, it is a NASA Earth System Science Pathfinder Mission that was launched with the purpose of collecting the first frequent space‐based measurements of surface wind speeds in the inner core of tropical cyclones. Originally made up of a constellation of eight micro-satellites, the observatories provide nearly gap-free Earth coverage using an orbital inclination of approximately 35° from the equator, with a mean (i.e., average) revisit time of seven hours and a median revisit time of three hours.

The soil moisture algorithm uses collocated soil moisture retrievals from SMAP to calibrate CYGNSS observations from the same day. For a given location, a linear relationship between the SMAP soil moisture and CYGNSS reflectivity is determined and used to transform the CYGNSS observations into soil moisture. The data are archived in daily files in netCDF-4 format. Two soil moisture variables report the volumetric water content in units of cm3/cm3. The variable SM_subdaily includes up to four soil moisture estimates per day. Another variable SM_daily provides a daily average. The time series covers the period from March 2017 to present.
DOI10.5067/CYGNU-L3S32
MeasurementLAND SURFACE > SOILS > SOIL MOISTURE/WATER CONTENT
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.

ProjectCyclone Global Navigation Satellite System (CYGNSS)
Data ProviderPublisher: PO.DAAC
Creator: CYGNSS
Release Place: PO.DAAC
Release Date: 2024-Jun-28
Resource: https://cygnss.engin.umich.edu/

FormatnetCDF-4
Keyword(s)cygnss, level 3, l3, soil moisture, bistatic radar, cosmic, ucar, cu, version 3.2, v3.2
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
Resolution
Spatial Resolution: 0.3 Decimal Degrees x 0.37 Decimal Degrees
Temporal Resolution: Hourly - < Daily
 
Coverage
Region: GLOBAL
North Bounding Coordinate: 38 degrees
South Bounding Coordinate: -38 degrees
West Bounding Coordinate: -135 degrees
East Bounding Coordinate: 164 degrees
Time Span: 2017-Mar-18 to Present
Granule Time Span: 2017-Mar-18 to 2024-Jun-11
 
Projection
Projection Type: Lambert Cylindrical Equal Area
Projection Detail: WGS 84 / NSIDC EASE-Grid 2.0 Global
 
ANOMALIES
GENERAL DOCUMENTATION
PUBLICATIONS
  • https://doi.org/10.3390/rs12101558
    Chew, C.C., E.E. Small. 'Description of the UCAR/CU Soil Moisture Product'. Remote Sens. 2020, 12, 1558. https://doi.org/10.3390/rs12101558
  • https://doi.org/10.1029/2018GL077905
    Chew, C. C., & Small, E. E. (2018). Soil Moisture Sensing Using Spaceborne GNSSReflections: Comparison of CYGNSS Reflectivity to SMAP Soil Moisture.Geophysical Research Letters, 45(9), 4049-4057.https://doi.org/10.1029/2018GL077905
DATA RECIPE
USER'S GUIDE
DATA CITATION POLICY
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. 2024. CYGNSS Level 3 Soil Moisture Version 3.2. Ver. 3.2. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/CYGNU-L3S32

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For more information see Data Citations and Acknowledgments.

Journal Reference Chew, C.C., E.E. Small.. 2020. Description of the UCAR/CU Soil Moisture Product, Remote Sens, 12, 10. https://doi.org/10.3390/rs12101558

VersionDatasetVersion DateStatus
3.2CYGNSS Level 3 Soil Moisture Version 3.22024-04-10ACTIVE2024-04-10T19:46:00.000Z
1.0UCAR-CU CYGNSS Level 3 Soil Moisture Version 1.02022-04-11ACTIVE2022-04-11T17:36:00.000Z