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Description

This Level-2 (L2) soil moisture product provides estimates of global land surface conditions retrieved by the Soil Moisture Active Passive (SMAP) active radar during 6:00 a.m. descending half-orbit passes, as well as ancillary data such as surface temperature and vegetation water content. Input backscatter data used to derive soil moisture are resampled to an Earth-fixed, global, cylindrical 3 km Equal-Area Scalable Earth Grid, Version 2.0 (EASE-Grid 2.0).

Version Description

Changes to this version include:
  • Transitioned to Validated-Stage 1
  • Uses updated SPL1CS0 V3 as input
  • Updates to some of the data cubes
  • Update of crop database
  • Modified iterative bias correction
  • Estimation of VWC
For the full major and minor version history, go to https://nsidc.org/data/smap/version-history

Product Summary

Platforms
SMAP
Instruments
SMAP L-BAND RADAR
Spatial Extent

N: 85.044 S: -85.044 E: 180 W: -180

Spatial Resolution
3 Kilometers x 3 Kilometers
Spatial Reference System(s)
WGS 84 / NSIDC EASE-Grid 2.0 Global (EPSG:6933)
Location
GLOBAL LAND
Coordinate System
CARTESIAN
Granule Spatial Representation
GEODETIC
Temporal Extent
2015-04-13 to 2015-07-07
Temporal Resolution
49 Minute
Concept ID
C2812935277-NSIDC_CPRD
Data State
COMPLETE
Number of Files/Granules
1173
Processing Level
2
Published
Science Keywords
SIGMA NAUGHT ,
Soil Moisture/Water Content

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

Kim, S., Van Zyl, J., Dunbar, R., Njoku, E., Johnson, J., Moghaddam, M., & Tsang, L. (2016). SMAP L2 Radar Half-Orbit 3 km EASE-Grid Soil Moisture, Version 3 [Dataset]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/J8SGO1E0Y9XZ Date Accessed: 2026-09-15

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