CYGNSS Level 3 Soil Moisture Version 3.2
(CYGNSS_L3_SOIL_MOISTURE_V3.2)Version | 3.2 |
Processing Level | 3 |
Start/Stop Date | 2018-Aug-01 to Present |
Short Name | CYGNSS_L3_SOIL_MOISTURE_V3.2 |
Description | The CYGNSS Level 3 Soil Moisture V3.2 dataset is provided by the CYGNSS Science Team of the University of Michigan. It estimates volumetric water content for soils between 0-5 cm depth at a 6-hour discretization for most of the subtropics from the V3.2 reflectivity measurements provided in 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 Originally made up of a constellation of eight micro-satellites, the observatories provide nearly gap-free Earth coverage using an orbital inclination of approximately 35°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 retrieval algorithm is an update of the previous version developed by UCAR-CU using a linear regression of CYGNSS angle-normalized effective surface reflectivity trained against collocated SMAP soil moisture during the calibration period 8/1/2018 to 11/15/2023. The data are archived in daily files in netCDF-4 format. Volumetric soil moisture water content in units of cm3/cm3 is provided with two gridding resolutions, 9x9 km and 36x36 km. The variable SM_subdaily contains data reported in six hour intervals. The variable SM_daily provides a daily average. The time series covers the period from August 2018 to present. |
DOI | 10.5067/CYGNU-L3S32 |
Measurement | LAND 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. |
Project | Cyclone Global Navigation Satellite System (CYGNSS) |
Data Provider | Publisher: PO.DAAC Creator: CYGNSS Release Place: PO.DAAC Release Date: 2024-Jun-28 Resource: https://cygnss.engin.umich.edu/ |
Format | netCDF-4 |
Keyword(s) | cygnss, level 3, l3, soil moisture, bistatic radar, cosmic, ucar, cu, version 3.2, v3.2, soil, moisture |
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 Region: TROPICS North Bounding Coordinate: 38.15 degrees South Bounding Coordinate: -38.15 degrees West Bounding Coordinate: -135 degrees East Bounding Coordinate: 164 degrees Time Span: 2018-Aug-01 to Present Granule Time Span: 2017-Mar-18 to 2025-Feb-06 Projection Projection Type: Lambert Cylindrical Equal Area Projection Detail: WGS 84 / NSIDC EASE-Grid 2.0 Global |
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Available for access in-region with AWS Cloud | |
Region | |
us-west-2 | |
podaac-ops-cumulus-protected/CYGNSS_L3_SOIL_MOISTURE_V3.2/ | |
podaac-ops-cumulus-public/CYGNSS_L3_SOIL_MOISTURE_V3.2/ | |
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TOOLS AND SERVICES | |
Quality Flags (.nc) |
Name | Long Name | Unit |
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latitude | Latitude | degrees_north |
longitude | Longitude | degrees_east |
SIGMA_daily | Daily Soil Moisture Sigma | cm3 cm-3 |
SIGMA_subdaily | Sub-daily Soil Moisture Sigma | cm3 cm-3 |
SM_daily | Daily Soil Moisture | cm3 cm-3 |
SM_subdaily | Sub-daily Soil Moisture | cm3 cm-3 |
time | Time | days since 1970-01-01 00:00:00 UTC |
timeintervals | start and stop time for the sub-daily time periods | days since 2018-08-11 00:00:00 UTC |
ANOMALIES | |
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GENERAL DOCUMENTATION | |
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DATA RECIPE | |
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USER'S GUIDE | |
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DATA CITATION POLICY | |
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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
For more information see Data Citations and Acknowledgments.
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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 |
Version | Dataset | Version Date | Status | |
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3.2 | CYGNSS Level 3 Soil Moisture Version 3.2 | 2024-04-10 | ACTIVE | 2024-04-10T19:46:00.000Z |
1.0 | UCAR-CU CYGNSS Level 3 Soil Moisture Version 1.0 | 2022-04-11 | ACTIVE | 2022-04-11T17:36:00.000Z |