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Description

This Level-2 (L2) soil moisture product provides gridded estimates of global land surface conditions retrieved by the Soil Moisture Active Passive (SMAP) passive microwave radiometer during 6:00 a.m. descending half-orbit passes. Input SMAP L-band brightness temperature data used to derive soil moisture are resampled to an Earth-fixed, global, cylindrical 36 km Equal-Area Scalable Earth Grid, Version 2.0 (EASE-Grid 2.0). A variety of ancillary data are also used as input, such as soil texture and vegetation opacity.

Note: These data are Beta-release quality, meaning that they have not undergone full validation and may still contain significant errors.

Version Description

Changes to this version include: (1) Uses SPL1CTB V2 Validated-Stage 1 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
GEODETIC
Temporal Extent
2015-03-31 to 2016-04-21
Temporal Resolution
49 Minute
Concept ID
C4100780062-NSIDC_CPRD
Data State
DEPRECATED
Number of Files/Granules
0
Processing Level
2
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 L2 Radiometer Half-Orbit 36 km EASE-Grid Soil Moisture, Version 2 [Data set]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/3Q9102MCFF72 Date Accessed: 2026-06-16

Documents

Publications Citing This Dataset

Filters
Title Year Author Topic
Assessment of SMAP soil moisture for global simulation of gross primary He, Liming, Chen, Jing M., Liu, Jane, Belair, Stephane, Luo, Xiangzhong Brightness Temperature, Soil Moisture/Water Content
An assessment of SMOS version 6.20 products through Triple and Quadruple Collocation techniques considering ASCAT, ERA/Interim LAND, ISMNand SMAP soil ... Fascetti, F., Pierdicca, N., Crapolicchio, R., Pulvirenti, L., Muoz-Sabater, J. Brightness Temperature, Soil Moisture/Water Content
Evaluation of the validated Soil Moisture product from the SMAP radiometer O'Neill, P., Chan, S., Colliander, A., Dunbar, S., Njoku, E., Bindlish, R., Chen, F., Jackson, T., Burgin, M., Piepmeier, J., Yueh, S., Entekhabi, D., Cosh, M., Caldwell, T., Walker, J., Wu, X., Berg, A., Rowlandson, T., Pacheco, A., McNairn, H., Thibeault, M., Martinez-Fernandez, J., Gonzalez-Zamora, A., Seyfried, M., Bosch, D., Starks, P., Goodrich, D., Prueger, J., Palecki, M., Small, E., Zreda, M., Calvet, J-C., Crow, W., Kerr, Y. Brightness Temperature, Soil Moisture/Water Content
SMOS, ASCAT, SMAP and ERA soil moisture comparison through the triple and quadruple collocation Fascetti, F., Pierdicca, N., Pulvirenti, L., Crapolicchio, R. Brightness Temperature, Soil Moisture/Water Content
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