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Description
This Level-1C (L1C) product contains calibrated, geolocated, time-ordered 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. SMAP L-band Level-1B brightness temperature data were 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 Level-1B radiometer brightness temperature product.
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
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.
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Chan, S., Njoku, E., & Colliander, A. (2018). SMAP L1C Radiometer Half-Orbit 36 km EASE-Grid Brightness Temperatures, Version 4 [Data set]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/ZVILG0PS6CTI Date Accessed: 2026-06-15
Chan, Steven, Eni Njoku, and Andreas Colliander. “SMAP L1C Radiometer Half-Orbit 36 Km EASE-Grid Brightness Temperatures, Version 4.” NASA National Snow and Ice Data Center Distributed Active Archive Center, 2018. doi:10.5067/ZVILG0PS6CTI. Date Accessed: 2026-06-15
Chan, Steven, et al. SMAP L1C Radiometer Half-Orbit 36 Km EASE-Grid Brightness Temperatures, Version 4. NASA National Snow and Ice Data Center Distributed Active Archive Center, 2018, doi:10.5067/ZVILG0PS6CTI. Date Accessed: 2026-06-15