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Description

This Level-3 (L3) soil moisture product provides a composite of daily estimates of global land surface conditions retrieved by the Soil Moisture Active Passive (SMAP) passive microwave radiometer. Ancillary data include soil temperature, vegetation water content, and vegetation opacity and albedo. Input SMAP L-band brightness temperatures are resampled to a global, cylindrical 36 km Equal-Area Scalable Earth Grid, Version 2.0 (EASE-Grid 2.0). Note: These data are beta release quality, meaning that they have not undergone full validation and may still contain significant errors. In addition, the data field that indicates retrieval quality, called retrieval qual flag, was found to contain incorrect information. Users are advised to ignore this data field in Version 1 of this product.

Version Description

Changes to this version include: (1) Uses updated SPL1CTB and SPL2SMP V2 Beta data as input. (2) Corrects the retrieval quality flag error.

Product Summary

Platforms
SMAP
Instruments
SMAP L-BAND RADAR
Spatial Extent

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

Spatial Resolution
36 Kilometers x 36 Kilometers
Location
GLOBAL LAND
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2015-03-31 to 2016-04-20
Temporal Resolution
1 Day
Concept ID
C4112448244-NSIDC_CPRD
Data State
DEPRECATED
Number of Files/Granules
0
Processing Level
3
Published
Updated
Science Keywords
Brightness Temperature ,
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

ONeill, P., Chan, S., Njoku, E., Jackson, T., & Bindlish, R. (2015). SMAP L3 Radiometer Global Daily 36 km EASE-Grid Soil Moisture, Version 2 [Data set]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/7EW92T1NI4M4 Date Accessed: 2026-05-12

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