20260925 13020800 1.0 TRUE 150000000 5000 ItemDescription <div style='text-align:Left;'><div><div>Dates of Images:September 22, 2026Date of Next Image:UnknownSummary:SMAP Level-4 (L4) surface and root zone soil moisture (L4_SM) data are provided in three products. The SMAP L4 Global 3-hourly 9 km EASE-Grid Surface and Root Zone Soil Moisture Geophysical Data (SPL4SMGP, DOI: 10.5067/T5RUATAQREF8) product is a series of 3-hourly time average geophysical land surface fields that are output by the L4_SM algorithm. It is likely of primary interest to most users. The SMAP L4 Global 3-hourly 9 km EASE-Grid Surface and Root Zone Soil Moisture Analysis Update (SPL4SMAU, DOI: 10.5067/02LGW4DGJYRX) product provides diagnostics from the land surface analysis updates. It consists of a series of 3-hourly instantaneous (or snapshot) files that contain the assimilated SMAP observations, the corresponding land model predictions and analysis estimates, and additional data assimilation diagnostics. Lastly, the SMAP L4 Global 9 km EASE-Grid Surface and Root Zone Soil Moisture Land Model Constants (SPL4SMLM, DOI: 10.5067/PXQIBL2ALDZD) product provides static (time-invariant) land surface model constants that will be needed by some users for further interpretation of the geophysical land surface fields. This product consists of only one granule (file) per L4_SM data product version (as defined by a distinct Science Version ID). For each product, SMAP L-band brightness temperature data from descending and ascending half-orbit satellite passes (approximately 6:00 a.m. and 6:00 p.m. local solar time, respectively) are assimilated into a land surface model that is gridded using an Earth-fixed, global cylindrical 9 km Equal-Area Scalable Earth Grid, Version 2.0 (EASE-Grid 2.0) projection.Parameter(s):ROOT ZONE SOIL MOISTURESURFACE SOIL MOISTUREPlatform(s):GEOS-5SMAPSensor(s):NOT APPLICABLE (root zone)SMAP L-BAND RADIOMETER (surface soil moisture)Data Format(s):GeoTIFFTemporal Resolution:3 hourSpatial Resolution:9 kmSpatial Reference System(s):WGS 84 / NSIDC EASE-Grid 2.0 GlobalEPSG:6933Credits:Funding was provided by the NASA SMAP Mission. Computational resources were provided by the NASA High-End Computing program through the NASA Center for Climate Simulation. The generation and dissemination of SMAP data products possible includes staff at GSFC, JPL, and NSIDC.</div></div></div> Funding was provided by the NASA SMAP Mission. Computational resources were provided by the NASA High-End Computing program through the NASA Center for Climate Simulation. The generation and dissemination of SMAP data products possible includes staff at GSFC, JPL, and NSIDC. <div style='text-align:Left;'><div>As a condition of using these data, you must include a citation:Reichle, R.H., G. De Lannoy, R.D. Koster, W.T. Crow, J.S. Kimball, Q. Liu, and M. Bechtold. 2025. SMAP L4 Global 3-hourly 9 km EASE-Grid Surface and Root Zone Soil Moisture Analysis Update, Version 8. [Indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/02LGW4DGJYRX. [Date Accessed]. Reichle, R.H., G. De Lannoy, R.D. Koster, W.T. Crow, J.S. Kimball, Q. Liu, and M. Bechtold. 2025. SMAP L4 Global 3-hourly 9 km EASE-Grid Surface and Root Zone Soil Moisture Geophysical Data, Version 8. [Indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/T5RUATAQREF8. [Date Accessed].Reichle, R.H., G. De Lannoy, R.D. Koster, W.T. Crow, J.S. Kimball, Q. Liu, and M. Bechtold. 2025. SMAP L4 Global 9 km EASE-Grid Surface and Root Zone Soil Moisture Land Model Constants, Version 8. [Indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/PXQIBL2ALDZD. [Date Accessed]NASA data and products are freely available to federal, state, public, non-profit and commercial users. This information can be experimental- or research-grade data products and may not be appropriate for operational use. These NASA data products, services, and the Disasters Mapping Portal are intended to aid decision makers and enhance situational awareness, but these data are not guaranteed to be consistently available or routinely updated.</div></div> 202624_smap ImageServer 202624_smap 20260925