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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 half-orbit passes. SMAP L-band brightness temperatures are used to derive soil moisture data, which are then resampled to an Earth-fixed, global, cylindrical 36 km Equal-Area Scalable Earth Grid, Version 2.0 (EASE-Grid 2.0).

Version Description

Changes to this version include: (1) Transitioned to Validated-Stage 2. (2) Uses updated SPL1CTB V3 Validated data as input.

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 2016-12-07
Temporal Resolution
49 Minute
Concept ID
C4100780225-NSIDC_CPRD
Data State
DEPRECATED
Number of Files/Granules
0
Processing Level
2
Published
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 L2 Radiometer Half-Orbit 36 km EASE-Grid Soil Moisture, Version 3 [Dataset]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/PLRS64IU03IT Date Accessed: 2026-09-15

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Publications Citing This Dataset

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Title Year Author Topic
Understanding deforestation dynamics in Amazonian protected areas through land-use change models informed by conservation discourses Siegel, Katherine J., Mills-Novoa, Megan, Kinnebrew, Eva, Ochoa-Brito, Jose, Shoffner, Elizabeth Brightness Temperature, Soil Moisture/Water Content
Integration of qualitative and quantitative methods for landusechange modeling in a deforestation frontier Siegel, Katherine, Farah Perez, Aldo, Kinnebrew, Eva, MillsNovoa, Megan, Ochoa, Jose, Shoffner, Elizabeth Brightness Temperature, Soil Moisture/Water Content
Disaggregating satellite soil moisture products based on soil thermal inertia: A comparison of a downscaling model built at two spatial scales Senanayake, I.P., Yeo, I.-Y., Willgoose, G.R., Hancock, G.R. Land Surface Temperature, Emissivity, Vegetation Index, Normalized Difference Vegetation Index (NDVI), Enhanced Vegetation Index (EVI), Surface Pressure, Heat Flux, Longwave Radiation, Shortwave Radiation, Surface Temperature, Humidity, Evapotranspiration, Surface Winds, Rain, Precipitation Rate, Snow, Soil Moisture/Water Content, Soil Temperature, Snow Water Equivalent, Runoff, Brightness Temperature
Estimating surface soil moisture from SMAP observations using a Neural Network technique Kolassa, J., Reichle, R.H., Liu, Q., Alemohammad, S.H., Gentine, P., Aida, K., Asanuma, J., Bircher, S., Caldwell, T., Colliander, A., Cosh, M., Holifield Collins, C., Jackson, T.J., Martinez-Fernandez, J., McNairn, H., Pacheco, A., Thibeault, M., Walker, J.P. Soil Temperature, Soil Moisture/Water Content, Brightness Temperature
Covariation of SMAP active and passive measurements with respect to vegetation and surface roughness Zeng, Jiangyuan, Akbar, Ruzbeh, Chen, Kun-Shan, Zhao, Tianjie, Yao, Panpan, Cui, Huizhen, Lu, Hui, Entekhabi, Dara ORBITAL CHARACTERISTICS, RADAR IMAGERY, SIGMA NAUGHT, Brightness Temperature, Soil Moisture/Water Content
Validation of the Soil Moisture Active Passive (SMAP) satellite soil moisture retrieval in an Arctic tundra environment Wrona, Elizabeth, Rowlandson, Tracy L., Nambiar, Manoj, Berg, Aaron A., Colliander, Andreas, Marsh, Philip Brightness Temperature, Soil Moisture/Water Content
A comparative study of the SMAP passive soil moisture product with existing satellite-based soil moisture products Burgin, Mariko S., Colliander, Andreas, Njoku, Eni G., Chan, Steven K., Cabot, Francois, Kerr, Yann H., Bindlish, Rajat, Jackson, Thomas J., Entekhabi, Dara, Yueh, Simon H. Brightness Temperature, Soil Moisture/Water Content, Soil Moisture/Water Content
A data-driven approach for daily real-time estimates and forecasts of near-surface soil moisture Koster, Randal D., Reichle, Rolf H., Mahanama, Sarith P. P. Brightness Temperature, Soil Moisture/Water Content
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