{"@type": "dcat:Dataset", "accessLevel": "public", "bureauCode": ["026:00"], "contactPoint": {"@type": "vcard:Contact", "fn": "NSIDC Services", "hasEmail": "mailto:nsidc@nsidc.org"}, "description": "SMAP Level-4 (L4) surface and root zone soil moisture data are provided in three products:\n<ul> \n  <li>SMAP L4 Global 3-hourly 9 km EASE-Grid Surface and Root Zone Soil Moisture Geophysical Data (SPL4SMGP, DOI: 10.5067/EVKPQZ4AFC4D)</li>\n  <li>SMAP L4 Global 3-hourly 9 km EASE-Grid Surface and Root Zone Soil Moisture Analysis Update (SPL4SMAU, DOI: 10.5067/LWJ6TF5SZRG3)</li>\n  <li>SMAP L4 Global 9 km EASE-Grid Surface and Root Zone Soil Moisture Land Model Constants (SPL4SMLM, DOI: 10.5067/KN96XNPZM4EG).</li>\n</ul>\nFor 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.", "distribution": [{"@type": "dcat:Distribution", "description": "Direct download via HTTPS protocol.", "downloadURL": "https://n5eil01u.ecs.nsidc.org/SMAP/SPL4SMAU.007/", "format": "HTML", "mediaType": "text/html", "title": "Download this dataset"}, {"@type": "dcat:Distribution", "description": "Includes a user's guide, supplemental documents like ATBDs and academic papers, How Tos, FAQs, etc.", "downloadURL": "https://doi.org/10.5067/LWJ6TF5SZRG3", "format": "HTML", "mediaType": "text/html", "title": "View documentation related to this dataset"}, {"@type": "dcat:Distribution", "description": "NASA's newest search and order tool for subsetting, reprojecting, and reformatting data.", "downloadURL": "https://search.earthdata.nasa.gov/search?q=SPL4SMAU+V007", "format": "HTML", "mediaType": "text/html", "title": "Download this dataset through Earthdata Search"}, {"@type": "dcat:Distribution", "description": "Search and filter data files using a map-based interface", "downloadURL": "https://nsidc.org/data/data-access-tool/SPL4SMAU/versions/7/", "format": "HTML", "mediaType": "text/html", "title": "Download this dataset"}, {"@type": "dcat:Distribution", "description": "Search results for publications that cite this dataset by its DOI.", "downloadURL": "https://scholar.google.com/scholar?q=10.5067%2FLWJ6TF5SZRG3", "format": "HTML", "mediaType": "text/html", "title": "Google Scholar search results"}, {"@type": "dcat:Distribution", "description": "This application allows you to interactively browse global satellite imagery within hours of it being acquired. You can also save it, share it, and download the underlying data.", "downloadURL": "https://worldview.earthdata.nasa.gov/?v=-215.35490720580785%2C-72.26175513012362%2C124.98316257744611%2C94.23627065806534&l=SMAP_L4_Analyzed_Surface_Soil_Moisture%2CCoastlines_15m%2CMODIS_Terra_CorrectedReflectance_TrueColor&lg=false&t=2022-04-09-T04%3A00%3A00Z", "format": "HTML", "mediaType": "text/html", "title": "Get a related visualization through WORLDVIEW"}], "identifier": "C2537927247-NSIDC_ECS", "issued": "2015-03-31", "keyword": ["earth-science", "land-surface", "soils"], "landingPage": "https://doi.org/10.5067/LWJ6TF5SZRG3", "language": ["en-US"], "modified": "2025-07-17", "programCode": ["026:001"], "publisher": {"@type": "org:Organization", "name": "NASA NSIDC DAAC"}, "spatial": "-180.0 -85.044 180.0 85.044", "temporal": "2015-03-31T00:00:00Z/2025-03-24T00:00:00Z", "theme": ["geospatial"], "title": "SMAP L4 Global 3-hourly 9 km EASE-Grid Surface and Root Zone Soil Moisture Analysis Update V007"}