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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:
As part of the algorithm changes, the following data fields were added: bulk_density, clay_fraction.
The baseline algorithm (SCA-V) remains unchanged.
Improved aggregation of values in input ancillary data, e.g. roughness, soil texture, NDVI. The fix has negligible impacts on retrievals estimated to be of recommended quality.
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. (2019). SMAP L3 Radiometer Global Daily 36 km EASE-Grid Soil Moisture, Version 6 [Dataset]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/EVYDQ32FNWTH Date Accessed: 2026-07-28
ONeill, P., Chan, S., Njoku, E., Jackson, T., Bindlish, R., & Chaubell, J. (2019). SMAP L3 Radiometer Global Daily 36 km EASE-Grid Soil Moisture, Version 6 [Dataset]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/EVYDQ32FNWTH Date Accessed: 2026-07-28
ONeill, Peggy, et al. “SMAP L3 Radiometer Global Daily 36 Km EASE-Grid Soil Moisture, Version 6.” NASA National Snow and Ice Data Center Distributed Active Archive Center, 2019, https://doi.org/10.5067/EVYDQ32FNWTH. Date Accessed: 2026-07-28
Shevliakova, E., Malyshev, S., MartinezCano, I., Milly, P. C. D., Pacala, S. W., Ginoux, P., Dunne, K. A., Dunne, J. P., Dupuis, C., Findell, K. L., Ghannam, K., Horowitz, L. W., Knutson, T. R., Krasting, J. P., Naik, V., Phillipps, P., Zadeh, N., Yu, Yan, Zeng, F., Zeng, Y.