Skip to main content

Description

This Level-2 (L2) soil moisture product provides estimates of land surface conditions retrieved by both the Soil Moisture Active Passive (SMAP) radiometer during 6:00 a.m. descending and 6:00 p.m. ascending half-orbit passes and the Sentinel-1A and -1B radar. SMAP L-band brightness temperatures and Copernicus Sentinel-1 C-band backscatter coefficients are used to derive soil moisture data, which are then resampled to an Earth-fixed, cylindrical 3 km Equal-Area Scalable Earth Grid, Version 2.0 (EASE-Grid 2.0). While the 3 km data product has undergone validation, the 1 km product has not and should be used with caution.

Product Summary

Platforms
SMAP ,
Sentinel-1A ,
Sentinel-1B
Instruments
SMAP L-BAND RADIOMETER ,
C-SAR
Spatial Extent

N: 60 S: -60 E: 180 W: -180

Spatial Resolution
3 Kilometers x 3 Kilometers
Geographic Region
OCEANIA ,
AFRICA ,
ASIA ,
EUROPE ,
NORTH AMERICA ,
SOUTH AMERICA
Coordinate System
CARTESIAN
Granule Spatial Representation
GEODETIC
Temporal Extent
2015-03-31 to Present
Concept ID
C2938663471-NSIDC_CPRD
Data State
ACTIVE
Number of Files/Granules
1763491
Processing Level
2
Published
Science Keywords
Brightness Temperature ,
SIGMA NAUGHT ,
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

Das, N., Entekhabi, D., Dunbar, R., Kim, S., Yueh, S., Colliander, A., ONeill, P., Jackson, T., Jagdhuber, T., Chen, F., Crow, W., Walker, J., Berg, A., Bosch, D., Caldwell, T., & Cosh, M. (2020). SMAP/Sentinel-1 L2 Radiometer/Radar 30-Second Scene 3 km EASE-Grid Soil Moisture, Version 3 [Data set]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/ASB0EQO2LYJV Date Accessed: 2025-12-16

Documents

USER'S GUIDE

GENERAL DOCUMENTATION