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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) passive microwave radiometer during 6:00 a.m. descending and 6:00 p.m. ascending half-orbit passes. SMAP L-band brightness temperatures are resampled to an Earth-fixed, global, cylindrical 36 km Equal-Area Scalable Earth Grid, Version 2.0 (EASE-Grid 2.0) [and made available as the SPL1CTB product], and the gridded brightness temperatures are then used to derive gridded soil moisture data.

Version Description

Changes to this version include: • An improved processing methodology was applied to the input Level-1C radiometer brightness temperatures. • The data algorithms, structure, content, or processor code are otherwise unchanged from the previous version. 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 RADIOMETER
Spatial Extent

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

Spatial Resolution
36 Kilometers x 36 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
2015-03-31 to Present
Temporal Resolution
49 Minute
Concept ID
C2938663609-NSIDC_CPRD
Data State
ACTIVE
Number of Files/Granules
116061
Processing Level
2
Published
Science Keywords
Brightness Temperature ,
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

ONeill, P., Chan, S., Njoku, E., Jackson, T., Bindlish, R., & Chaubell, J. (2023). SMAP L2 Radiometer Half-Orbit 36 km EASE-Grid Soil Moisture, Version 9 [Dataset]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/K7Y2D8QQVZ4L Date Accessed: 2026-06-11

Documents

Publications Citing This Dataset

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Title Year Author Topic
Confidently uncertain: validating satellite ECV measurement uncertainty estimates Verhoelst, Tijl, Povey, Adam C., Gruber, Alexander, Bulgin, Claire E., Keppens, Arno, Compernolle, Steven, Lambert, Jean-Christopher Brightness Temperature, Surface Soil Moisture
The importance of scale in the definition of uncertainties: how do we best communicate this to data users? Bulgin, Claire E., Green, Paul, Gruber, Alexander, Macintosh, Claire, Mittaz, Jonathan, Ramsay, Ashley, Rayner, Nick A. Surface Pressure, Heat Flux, Longwave Radiation, Shortwave Radiation, Surface Temperature, Humidity, Evapotranspiration, Surface Winds, Rain, Precipitation Rate, Snow, Soil Moisture/Water Content, Soil Temperature, Land Surface Temperature, Snow Water Equivalent, Runoff, Brightness Temperature, Surface Soil Moisture
Joint assimilation of satellite-based surface soil moisture and vegetation conditions into the Noah-MP land surface model Heyvaert, Zdenko, Scherrer, Samuel, Dorigo, Wouter, Bechtold, Michel, De Lannoy, Gabrielle Brightness Temperature, Surface Soil Moisture
Improving weather forecast skill of the Korean Integrated Model by assimilating Soil Moisture Active Passive soil moisture anomalies Kwon, Yonghwan, Jun, Sanghee, Kim, Eunkyu, Seol, KyungHee, Hong, Seokmin, Kwon, InHyuk, Kang, JeonHo, Kim, Hyunglok Brightness Temperature, Surface Soil Moisture
Estimating Hydrological Regimes from Observational Soil Moisture, Evapotranspiration, and Air Temperature Data Koster, R. D., Feldman, A. F., Holmes, T. R. H., Anderson, M. C., Crow, W. T., Hain, C. Brightness Temperature, Surface Soil Moisture
An RFI-suppressed SMOS L-band multi-angular brightness temperature dataset spanning over a decade (since 2010) Peng, Zhiqing, Zhao, Tianjie, Shi, Jiancheng, Kerr, Yann H., Rodriguez-Fernandez, Nemesio J., Yao, Panpan, Che, Tao Brightness Temperature, Surface Soil Moisture
Integrating open-source datasets to analyze the transboundary waterfoodenergyclimate nexus in Central Asia De Keyser, Jan, Hayes, Daniel S., Marti, Beatrice, Siegfried, Tobias, Seliger, Carina, Schwedhelm, Hannah, Anarbekov, Oyture, Gafurov, Zafar, Lopez Fernandez, Raquel M., Ramos Diez, Ivan, Alapfy, Bertalan, Carey, Justine, Karimov, Bakhtiyor, Karimov, Erkin, Wagner, Beatrice, Habersack, Helmut Brightness Temperature, Surface Soil Moisture, Precipitation, Precipitation Amount, Precipitation Rate, Snow, Rain
Multi-Source Soil Moisture Data Fusion Based on Spherical Cap Harmonic Chen, Hao, Chen, Peng, Wang, Rong, Qiu, Liangcai, Tang, Fucai, Xiong, Mingzhu Surface Pressure, Heat Flux, Longwave Radiation, Shortwave Radiation, Surface Temperature, Humidity, Evapotranspiration, Surface Winds, Rain, Precipitation Rate, Snow, Soil Moisture/Water Content, Soil Temperature, Land Surface Temperature, Snow Water Equivalent, Runoff, RADAR IMAGERY, Terrain Elevation, Digital Elevation/Terrain Model (DEM), Brightness Temperature, Surface Soil Moisture
Impact of Incidence Angle Diversity on SMOS and Sentinel-1 Soil Moisture Retrievals at Coarse and Fine Scales Portal, Gerard, Vall-llossera, Merce, Piles, Maria, Jagdhuber, Thomas, Camps, Adriano, Pablos, Miriam, Lopez-Martinez, Carlos, Das, Narendra N., Entekhabi, Dara Land Use/Land Cover Classification, Plant Phenology, Enhanced Vegetation Index (EVI), Brightness Temperature, SIGMA NAUGHT, Surface Soil Moisture, Terrain Elevation
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