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Description

This data set is derived by downscaling Soil Moisture Active Passive (SMAP) enhanced Level-3 9 km brightness temperatures (TB) using Cyclone Global Navigation Satellite System (CYGNSS) reflectivity data and employing a slightly modified version of the SMAP baseline active-passive TB algorithm. The SMAP Single Channel Algorithm – Vertical polarization (SCA-V) is then used to derive soil moisture from SMAP/CYGNSS Tb data. The main parameter of this data set is surface soil moisture presented on the Global EASE-Grid 2.0 projection, with each data point representing the top 5 cm of the soil column. For SMAP-derived data, see <a href="https://doi.org/10.5067/4DQ54OUIJ9DL">SMAP Enhanced L3 Radiometer Global and Polar Grid Daily 9 km EASE-Grid Soil Moisture, Version 5</a>; for CYGNSS-derived data, see <a href="https://doi.org/10.5067/CYGNS-L1X21">CYGNSS Level 1, Version 2.1</a>.

Product Summary

Platforms
CYGNSS ,
SMAP
Instruments
DDMI ,
SMAP L-BAND RADIOMETER
Spatial Extent

N: 40 S: -40 E: 180 W: -180

Spatial Resolution
3 Kilometers x 3 Kilometers
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2017-04-01 to 2023-12-31
Concept ID
C3327092113-NSIDC_CPRD
Data State
COMPLETE
Number of Files/Granules
2383
Processing Level
3
Science Keywords
Brightness Temperature ,
Surface Soil Moisture

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

Wernicke, L. J., Chew, C. C., & Small, E. E. (2024). SMAP/CYGNSS EASE-Grid Soil Moisture, Version 1 [Data set]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/8OODMTVR6RT9 Date Accessed: 2025-12-14

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