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Description

This enhanced Level-1C (L1C) product contains calibrated, geolocated, brightness temperatures acquired 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-1B (L1B) interpolated antenna 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 a 9 km Equal-Area Scalable Earth Grid, Version 2.0 (EASE-Grid 2.0) in three projections: global cylindrical, Northern Hemisphere azimuthal, and Southern Hemisphere azimuthal.

Version Description

Updated input SPL1BTB product with water correction applied, resulting in warmer TBs over land and cooler TBs over water. 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
9 Kilometers x 9 Kilometers
Spatial Reference System(s)
Multiple EPSG codes (see User Guide)
Location
GLOBAL LAND
Coordinate System
CARTESIAN
Granule Spatial Representation
GEODETIC
Temporal Extent
2015-03-31 to 2020-08-27
Temporal Resolution
49 Minute
Concept ID
C2830467879-NSIDC_CPRD
Data State
DEPRECATED
Number of Files/Granules
0
Processing Level
1C
Published
Updated
Science Keywords
Brightness Temperature

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

Chaubell, J., Chan, S., Dunbar, R., Peng, J., & Yueh, S. (2018). SMAP Enhanced L1C Radiometer Half-Orbit 9 km EASE-Grid Brightness Temperatures, Version 2 [Data set]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/0DGGEWUC6MLY Date Accessed: 2026-06-13

Documents

Publications Citing This Dataset

Filters
Title Year Author Topic
Evaluating the effective resolution of enhanced resolution SMAP brightness temperature image products Long, David G., Brodzik, Mary J., Hardman, Molly Brightness Temperature
Robustness of Vegetation Optical Depth Retrievals Based on L-Band Global Radiometry Chaparro, David, Feldman, Andrew F., Chaubell, Mario Julian, Yueh, Simon H., Entekhabi, Dara Vegetation Index, Normalized Difference Vegetation Index (NDVI), Enhanced Vegetation Index (EVI), Precipitation, Precipitation Amount, Precipitation Rate, Snow, Rain, Surface Soil Moisture, Brightness Temperature
Toward improved comparisons between landsurfacewaterarea estimates from a global river model and satellite observations Zhou, Xudong, Prigent, Catherine, Yamazaki, Dai Brightness Temperature
Prospects for Detecting Volcanic Events with Microwave Radiometry MacKenzie, Shannon M., Lorenz, Ralph D. Brightness Temperature
Global Assessment of the SMAP Freeze/Thaw Data Record and Regional Kim, Youngwook, Kimball, John S., Xu, Xiaolan, Dunbar, R. Scott, Colliander, Andreas, Derksen, Chris Transition Direction, Brightness Temperature, Soil Moisture/Water Content, Reflectance, Total Surface Water, Canopy Characteristics, Evergreen Vegetation, Crown, Deciduous Vegetation, Leaf Characteristics, Vegetation Cover, Land Use/Land Cover Classification, Soil Organic Carbon (SOC), Freeze/Thaw
Evaluation of real-time global flood modeling with satellite surface inundation observations from SMAP Wu, Huan, Kimball, John S., Zhou, Naijun, Alfieri, Lorenzo, Luo, Lifeng, Du, Jinyang, Huang, Zhijun Brightness Temperature
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