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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, north polar, and south polar. This L1C product is a gridded version of the SMAP Level-1B radiometer brightness temperature product.
Version Description
Changes to this version include:
Uses updated SPL1BTB V3 Validated data as input
Updated processing to produce SPL1CTB data files when partial half-orbit input files are present
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. (2016). SMAP L1C Radiometer Half-Orbit 36 km EASE-Grid Brightness Temperatures, Version 3 [Dataset]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/E51BSP6V3KP7 Date Accessed: 2026-09-13
@misc{chan_njoku_colliander_2016,
title={SMAP L1C Radiometer Half-Orbit 36 km EASE-Grid Brightness Temperatures, Version 3},
url={http://nsidc.org/data/SPL1CTB/versions/3},
DOI={10.5067/E51BSP6V3KP7},
publisher={NASA National Snow and Ice Data Center Distributed Active Archive Center},
author={Chan, Steven and Njoku, Eni and Colliander, Andreas},
year={2016},
}
Chan, S., Njoku, E., & Colliander, A. (2016). SMAP L1C Radiometer Half-Orbit 36 km EASE-Grid Brightness Temperatures, Version 3 [Dataset]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/E51BSP6V3KP7 Date Accessed: 2026-09-13
Chan, Steven, et al. “SMAP L1C Radiometer Half-Orbit 36 Km EASE-Grid Brightness Temperatures, Version 3.” NASA National Snow and Ice Data Center Distributed Active Archive Center, 2016, https://doi.org/10.5067/E51BSP6V3KP7. Date Accessed: 2026-09-13
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Chaubell, Julian, Yueh, Simon H., Peng, Jinzheng, Dunbar, R. Scott, Chan, Steven K., Chen, Fan, Piepmeier, Jeffrey R., Bindlish, Rajat, Entekhabi, Dara, O'Neill, Peggy E.
Piepmeier, Jeffrey R., Peng, Jinzheng, Misra, Sidharth, Dinnat, Emmanuel P., Yueh, Simon H., Meissner, Thomas, Vine, David M. Le, Shelton, Kacie E., Freedman, Adam P., Dunbar, R. Scott, Chan, Steven K., Chaubell, Julian, Bindlish, Rajat, De Amici, Giovanni, Mohammed, Priscilla N., Hong, Liang
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