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Description

This enhanced Level-2 (L2) soil moisture product provides estimates of global land surface conditions retrieved by the Soil Moisture Active Passive (SMAP) radiometer during 6:00 a.m. descending and 6:00 p.m. ascending half-orbit passes. This product is derived from SMAP Level-1C (L1C) interpolated brightness temperatures. Backus-Gilbert optimal interpolation techniques are used to extract maximum information from SMAP antenna temperatures and convert them to brightness temperatures, which are posted to the 9 km Equal-Area Scalable Earth Grid, Version 2.0 (EASE-Grid 2.0) in a global cylindrical projection.

Version Description

First public data release

Product Summary

Platforms
SMAP
Instruments
SMAP L-BAND RADAR
Spatial Extent

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

Spatial Resolution
9 Kilometers x 9 Kilometers
Location
GLOBAL LAND
Coordinate System
CARTESIAN
Granule Spatial Representation
GEODETIC
Temporal Extent
2015-03-31 to 2018-06-04
Temporal Resolution
49 Minute
Concept ID
C4100784484-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. (2016). SMAP Enhanced L2 Radiometer Half-Orbit 9 km EASE-Grid Soil Moisture, Version 1 [Data set]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/CE0K6JS5WQMM Date Accessed: 2026-06-13

Documents

Publications Citing This Dataset

Filters
Title Year Author Topic
Improving Near-Surface Weather Forecasts with Strongly Coupled LandAtmosphere Data Assimilation Pu, Zhaoxia Brightness Temperature, Soil Moisture/Water Content
An intercomparison study of algorithms for downscaling smap radiometer soil moisture retrievals Fang, Li, Zhan, Xiwu, Yin, Jifu, Liu, Jicheng, Schull, Mitchell, Walker, Jeffrey P., Wen, Jun, Cosh, Michael H., Lakhankar, Tarendra, Collins, Chandra Holifield, Bosch, David D., Starks, Patrick J. Soil Moisture/Water Content, Soil Temperature, Brightness Temperature
Examining the impact of SMAP soil moisture retrievals on short-range weather prediction under weakly and strongly coupled data assimilation with WRF ... Lin, Liao-Fan, Pu, Zhaoxia Brightness Temperature, Soil Moisture/Water Content
An assessment of the differences between spatial resolution and grid size for the SMAP enhanced soil moisture product over homogeneous sites Colliander, A., Jackson, T.J., Chan, S.K., O'Neill, P., Bindlish, R., Cosh, M.H., Caldwell, T., Walker, J.P., Berg, A., McNairn, H., Thibeault, M., Martinez-Fernandez, J., Jensen, K.H., Asanuma, J., Seyfried, M.S., Bosch, D.D., Starks, P.J., Holifield Collins, C., Prueger, J.H., Su, Z., Lopez-Baeza, E., Yueh, S.H. Brightness Temperature, Soil Moisture/Water Content
Assessing SMAP soil moisture scaling and retrieval in the Carman (Canada) study site Bhuiyan, Hassan A.K.M., McNairn, Heather, Powers, Jarrett, Friesen, Matthew, Pacheco, Anna, Jackson, Thomas J., Cosh, Michael H., Colliander, Andreas, Berg, Aaron, Rowlandson, Tracy, Bullock, Paul, Magagi, Ramata Brightness Temperature, Soil Moisture/Water Content
Correction of forcing-related spatial artifacts in a land surface model by satellite soil moisture data assimilation Blankenship, Clay B., Case, Jonathan L., Crosson, William L., Zavodsky, Bradley T. Brightness Temperature, Soil Moisture/Water Content
L band microwave remote sensing and land data assimilation improve the Crow, W. T., Chen, F., Reichle, R. H., Liu, Q. Root Zone Soil Moisture, Surface Soil Moisture, Brightness Temperature, Soil Moisture/Water Content
Using Sentinel-1 data for monitoring of soil moisture Garkusha, Igor N., Hnatushenko, Volodymyr V., Vasyliev, Volodymyr V. Brightness Temperature, Soil Moisture/Water Content, Vegetation Water Content, Brightness Temperature
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