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Description

This Level-1B (L1B) product provides calibrated estimates of time-ordered geolocated brightness temperatures measured by the Soil Moisture Active Passive (SMAP) passive microwave radiometer. SMAP L-band brightness temperatures are referenced to the Earth's surface with undesired and erroneous radiometric sources removed.

Version Description

Changes to this version include:

  • Added procedure to correct brightness temperatures for water/land contamination near coastlines. New data fields for this correction include: footprint_surface_status, surface_water_fraction_mb_h, surface_water_fraction_mb_v, tb_h_surface_corrected, and tb_v_surface_corrected.
  • Improved Level-1 calibration coefficients and reflected galaxy correction. To refine reflected galaxy correction over ocean, NOAA NCEP ocean roughness data have been added (wind_direction_ancillary, wind_speed_ancillary).
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: 86.4 S: -86.4 E: 180 W: -180

Spatial Resolution
36 Kilometers x 47 Kilometers
Spatial Reference System(s)
WGS 84 (EPSG:4326)
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
C2812934708-NSIDC_CPRD
Data State
DEPRECATED
Number of Files/Granules
0
Processing Level
1B
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

Piepmeier, J., Mohammed, P., Peng, J., Kim, E., De Amici, G., Chaubell, J., & Ruf, C. (2018). SMAP L1B Radiometer Half-Orbit Time-Ordered Brightness Temperatures, Version 4 [Dataset]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/VA6W2M0JTK2N Date Accessed: 2026-07-30

Documents

Publications Citing This Dataset

Filters
Title Year Author Topic
An evaluation of the synergy of satellite passive microwave observations between 1.4 and 36 GHz, for vegetation characterization over the Tropics Prigent, Catherine, Jimenez, Carlos Brightness Temperature
Calibration of the SMAP Radiometer for Ocean Applications Meissner, Thomas, Wentz, Frank Salinity, Brightness Temperature
Characteristics of radio frequency interference in the protected portion of L-band Aksoy, Mustafa, Rajabi, Hamid Sensor Counts, Brightness Temperature
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