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Description

This 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 L-band Level-1B time-ordered brightness temperatures resampled to an Earth-fixed, 36 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. This L1C product is a gridded version of the SMAP time-ordered Level-1B radiometer brightness temperature product.

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
36 Kilometers x 36 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
C2938663268-NSIDC_CPRD
Data State
ACTIVE
Number of Files/Granules
114907
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

Chan, S., Njoku, E., & Colliander, A. (2023). SMAP L1C Radiometer Half-Orbit 36 km EASE-Grid Brightness Temperatures, Version 6 [Data set]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/DV7IX2DQ681Y Date Accessed: 2026-04-29

Documents

Filters
Title Year Author Topic
Assessing SMAP for enhanced wildfire danger prediction in boreal-Arctic ecosystems Bourgeau-Chavez, Laura L., Hanes, Chelene, Billmire, Michael, Bosse, Karl, Battaglia, Michael J., Colliander, Andreas Soil Temperature, Soil Moisture/Water Content, Soil Horizons/Profile, Soil Depth, Active Layer, Brightness Temperature
What is the uncertainty of the uncertainty and (why) does it matter? improving the uncertainty estimates of merged multi-satellite soil moisture data sets Formanek, Maud, Gruber, Alexander, Stradiotti, Pietro, Dorigo, Wouter Brightness Temperature
Assimilation of ASCAT Soil Moisture and SMAP Brightness Temperature Observations into the NASA GEOS Land Data Assimilation System Fox, Andrew M., Reichle, Rolf H., Liu, Qing Brightness Temperature
Predicting Freeze-Thaw States in Alaska Permafrost Landscapes using Ahajjam, A., Soaper, M., Chance, R., Chandler, J., Pasch, T. Heat Flux, Air Temperature, Skin Temperature, Specific Humidity, Water Vapor, Precipitation Rate, Snow/Ice, Evaporation, Latent Heat Flux, Latent Heat Flux, Sensible Heat Flux, Diffusion, Surface Winds, Wind Speed, U/V Wind Components, Wind Stress, Wind Stress, Surface Roughness, Planetary Boundary Layer Height, Ice Fraction, Atmospheric Radiation, Longwave Radiation, Shortwave Radiation, Radiative Flux, Radiative Forcing, Surface Radiative Properties, Albedo, Emissivity, Cloud Properties, Cloud Fraction, Cloud Optical Depth/Thickness, Skin Temperature, Sea Surface Skin Temperature, Geopotential Height, Altitude, Surface Temperature, Upper Air Temperature, Dew Point Temperature, Cloud Top Temperature, Atmospheric Winds, Surface Winds, Upper Level Winds, U/V Wind Components, Vertical Wind Velocity/Speed, Atmospheric Pressure, Sea Level Pressure, Cloud Top Pressure, Sea Level Pressure, Surface Pressure, Total Precipitable Water, Cloud Liquid Water/Ice, Atmospheric Water Vapor, Atmospheric Ozone, Oxygen Compounds, Boundary Layer Winds, Total Ozone, Soil Heat Budget, Soil Heat Budget, Soil Temperature, Soil Temperature, Soil Infiltration, Soil Infiltration, Soil Moisture/Water Content, Surface Soil Moisture, Root Zone Soil Moisture, Soil Moisture/Water Content, Surface Water, Runoff Rate, Average Flow, Average Flow, Precipitation, Snow Depth, Snow Melt, Snow/Ice Temperature, Leaf Area Index (LAI), Leaf Area Index (LAI), Brightness Temperature, Transition Direction
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