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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:
- Dual Channel Algorithm (DCA) replaces Single Channel Algorithm – Vertical (SCA-V) as baseline algorithm
- Bulk_density maximum value changed from 1 to 2.65
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. (2021). SMAP L3 Radiometer Global Daily 36 km EASE-Grid Soil Moisture, Version 8 [Dataset]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/OMHVSRGFX38O Date Accessed: 2026-08-01
ONeill, P., Chan, S., Njoku, E., Jackson, T., Bindlish, R., & Chaubell, J. (2021). SMAP L3 Radiometer Global Daily 36 km EASE-Grid Soil Moisture, Version 8 [Dataset]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/OMHVSRGFX38O Date Accessed: 2026-08-01
ONeill, Peggy, et al. “SMAP L3 Radiometer Global Daily 36 Km EASE-Grid Soil Moisture, Version 8.” NASA National Snow and Ice Data Center Distributed Active Archive Center, 2021, https://doi.org/10.5067/OMHVSRGFX38O. Date Accessed: 2026-08-01