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Description
This Level-3 (L3) soil moisture product provides a composite of daily estimates of global land surface conditions retrieved by the Soil Moisture Active Passive (SMAP) passive microwave radiometer. SMAP L-band soil moisture data are resampled to a global, cylindrical 36 km Equal-Area Scalable Earth Grid, Version 2.0 (EASE-Grid 2.0).
Version Description
Changes to this version include:
• An improved processing methodology was applied to the input Level-2 radiometer brightness temperatures.
• The data algorithms, structure, content, or processor code are otherwise unchanged from the previous version.
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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ONeill, P., Chan, S., Njoku, E., Jackson, T., Bindlish, R., & Chaubell, J. (2023). SMAP L3 Radiometer Global Daily 36 km EASE-Grid Soil Moisture, Version 9 [Dataset]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/4XXOGX0OOW1S Date Accessed: 2026-08-24
@misc{oneill_chan_njoku_jackson_bindlish_chaubell_2023,
title={SMAP L3 Radiometer Global Daily 36 km EASE-Grid Soil Moisture, Version 9},
url={http://nsidc.org/data/SPL3SMP/versions/9},
DOI={10.5067/4XXOGX0OOW1S},
publisher={NASA National Snow and Ice Data Center Distributed Active Archive Center},
author={ONeill, Peggy and Chan, Steven and Njoku, Eni and Jackson, Thomas and Bindlish, Rajat and Chaubell, Julian},
year={2023},
}
ONeill, P., Chan, S., Njoku, E., Jackson, T., Bindlish, R., & Chaubell, J. (2023). SMAP L3 Radiometer Global Daily 36 km EASE-Grid Soil Moisture, Version 9 [Dataset]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/4XXOGX0OOW1S Date Accessed: 2026-08-24
ONeill, Peggy, et al. “SMAP L3 Radiometer Global Daily 36 Km EASE-Grid Soil Moisture, Version 9.” NASA National Snow and Ice Data Center Distributed Active Archive Center, 2023, https://doi.org/10.5067/4XXOGX0OOW1S. Date Accessed: 2026-08-24