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Description

This enhanced Level-1C (L1C) product contains calibrated and 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 enhanced information from SMAP antenna temperatures before they are converted to brightness temperatures. The resulting brightness temperatures are posted to an Earth-fixed, 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

Changes to this version include: • Added new data elements cell_ice_shelf_fraction_h_[ fore | aft ] and cell_ice_shelf_fraction_v_[ fore | aft ] 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
Coordinate System
CARTESIAN
Granule Spatial Representation
GEODETIC
Temporal Extent
2015-03-31 to Present
Temporal Resolution
49 Minute
Concept ID
C2938663435-NSIDC_CPRD
Data State
ACTIVE
Number of Files/Granules
116555
Processing Level
1C
Published
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. (2023). SMAP Enhanced L1C Radiometer Half-Orbit 9 km EASE-Grid Brightness Temperatures, Version 4 [Dataset]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/99LHDR3NUM47 Date Accessed: 2026-06-11

Documents

Publications Citing This Dataset

Filters
Title Year Author Topic
Regional patterns of parameter sensitivity in the plant hydraulics Chen, Weijing, Hou, Jinliang Brightness Temperature
Evaluation of wet snow dielectric mixing models for L-band radiometric measurement of liquid water content in Greenland's percolation zone Hossan, Alamgir, Colliander, Andreas, Schlegel, Nicole-Jeanne, Harper, Joel, Andrews, Lauren, Kolassa, Jana, Miller, Julie Z., Cullather, Richard Brightness Temperature
Retrieval and validation of total seasonal liquid water amounts in the percolation zone of the Greenland ice sheet using L-band radiometry Hossan, Alamgir, Colliander, Andreas, Vandecrux, Baptiste, Schlegel, Nicole-Jeanne, Harper, Joel, Marshall, Shawn, Miller, Julie Z. Brightness Temperature
An improved algorithm for retrieving thin sea ice thickness in the Arctic Ocean from SMOS and SMAP L-band radiometer data He, Lian, Huang, Senwen, Hui, Fengming, Cheng, Xiao Brightness Temperature
Monitoring the Spatial Distribution of Cover Crops and Tillage Practices Using Machine Learning and Environmental Drivers across Eastern South Dakota Jain, Khushboo, John, Ranjeet, Torbick, Nathan, Kolluru, Venkatesh, Saraf, Sakshi, Chandel, Abhinav, Henebry, Geoffrey M., Jarchow, Meghann Land Surface Temperature, Emissivity, Evapotranspiration, Terrain Elevation, RADAR IMAGERY, Topographical Relief Maps, Brightness Temperature
Brief communication: Identification of tundra topsoil frozen/thawed state from SMAP and GCOM-W1 radiometer measurements using the spectral gradient ... Muzalevskiy, Konstantin, Ruzicka, Zdenek, Roy, Alexandre, Loranty, Michael, Vasiliev, Alexander Brightness Temperature
Spatial and temporal differences in surface and subsurface meltwater distribution over Greenland ice sheet using multi-frequency passive microwave ... Colliander, Andreas, Mousavi, Mohammad, Kimball, John S., Miller, Julie Z., Burgin, Mariko Brightness Temperature
Ice Sheet Melt Water Profile Mapping Using Multi-Frequency Microwave Radiometry Colliander, Andreas, Mousavi, Mohammad, Misra, Sid, Brown, Shannon, Kimball, John S., Miller, Julie, Johnson, Joel, Burgin, Mariko Brightness Temperature
Ice Sheet Surface and Subsurface Melt Water Discrimination using Multifrequency Microwave Radiometry Colliander, Andreas, Mousavi, Mohammad, Marshall, Shawn, Samimi, Samira, Kimball, John S., Miller, Julie Z., Johnson, Joel, Burgin, Mariko Brightness Temperature
Improving Spatial Representation of Soil Moisture through different downscaling approaches Sharma, Jyoti, Prasad, Rajendra, Srivastava, Prashant K., Yadav, Suraj A., Yadav, Vijay P. Surface Soil Moisture, Brightness Temperature
On the Synergy of SMAP and AMSR2 for Estimating Snow Depth on Arctic Sea He, Lian, Xue, Binghua, Huang, Senwen, Hui, Fengming, Chen, Zhuoqi, Cheng, Xiao Brightness Temperature, Sea Ice Concentration
Validation of NASA SMAP Satellite Soil Moisture Products over the Desert AlJassar, Hala, Temimi, Marouane, Abdelkader, Mohamed, Petrov, Peter, Kokkalis, Panagiotis, AlSarraf, Hussain, Roshni, Nair, Hendi, Hamad Al Brightness Temperature, SIGMA NAUGHT, Soil Moisture/Water Content, Surface Soil Moisture
Potential Satellite Monitoring of Surface Organic Soil Properties in Arctic Tundra from SMAP Yi, Yonghong, Chen, Richard H., Kimball, John S., Moghaddam, Mahta, Xu, Xiaolan, Euskirchen, Eugenie S., Das, Narendra, Miller, Charles E. Soil Texture, Active Layer, Cation Exchange Capacity, Soil Moisture/Water Content, Soil Bulk Density, Soil Porosity, Organic Matter, Brightness Temperature
Ocean and Sea Ice Retrievals From an EndToEnd Simulation of the Copernicus Imaging Microwave Radiometer (CIMR) 1.436.5 GHz Measurements Jimenez, Carlos, Tenerelli, Joseph, Prigent, Catherine, Kilic, Lise, Lavergne, Thomas, Skarpalezos, Sotirios, Hyer, Jacob L., Reul, Nicolas, Donlon, Craig Brightness Temperature
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