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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
116599
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 [Dataset]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/DV7IX2DQ681Y Date Accessed: 2026-06-15

Documents

Publications Citing This Dataset

Filters
Title Year Author Topic
Impact of assimilating SMAP observations over land on tropical cyclone representation: A case study of Tropical Cyclone Idai Kolassa, Jana, Ganeshan, Manisha, McGrathSpangler, Erica L., Reale, Oreste, Reichle, Rolf H., Zhang, Sara Q. Brightness Temperature
Feasibility of L-band Sharpening with C-band using SMAP and AMSR Radiometry Data for Future Application to CIMR Zhang, Michelle S., AlNasser, Faisal, Piles, Maria, Entekhabi, Dara Land Use/Land Cover Classification, Brightness Temperature
Pan-tropical daily L-band microwave land surface emissivity retrieval from GNSS-R observations Zhu, Yifan, Guo, Fei, Zhang, Xiaohong, Yang, Wentao Radar Cross-Section, Radar Reflectivity, SIGMA NAUGHT, Flight Data Logs, Surface Soil Moisture, Brightness Temperature
IMERG Precipitation Improves the SMAP Level-4 Soil Moisture Product Reichle, Rolf H., Liu, Qing, Ardizzone, Joseph V., Crow, Wade T., De Lannoy, Gabrielle J. M., Kimball, John S., Koster, Randal D. Surface Soil Moisture, Soil Moisture/Water Content, Soil Temperature, Precipitation, Precipitation Amount, Precipitation Rate, Snow, Rain, Brightness Temperature
Freeze/thaw onset detection combining SMAP and ASCAT data over Alaska: A machine learning approach Zhong, Wen, Yuan, Qiangqiang, Liu, Tingting, Yue, Linwei Emissivity, Land Surface Temperature, Brightness Temperature, Freeze/Thaw, Transition Direction
Uncertainty Estimation for SMAP Level-1 Brightness Temperature Assimilation at Different Timescales Gruber, Alexander, Reichle, Rolf H. Longwave Radiation, Shortwave Radiation, Heat Flux, Liquid Precipitation, Snow/Ice, Surface Pressure, Air Temperature, Specific Humidity, Surface Winds, Wind Speed, Geopotential Height, Brightness Temperature, Soil Moisture/Water Content
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