{"@type": "dcat:Dataset", "accessLevel": "public", "bureauCode": ["026:00"], "contactPoint": {"@type": "vcard:Contact", "fn": "Earthdata Forum", "hasEmail": "mailto:earthdata-support@nasa.gov"}, "description": "The VIIRS/NPP Albedo Daily L3 Global 500 m SIN Grid Near Real Time (NRT), short-name VNP43IA3N product provides albedo values at 500 m resolution for the bi-hemispherical reflectance white-sky albedos (WSA) and directional hemispherical reflectance black-sky albedos (BSA) at local solar noon. The VNP43IA3N product is produced daily using 16-day VIIRS data (i.e., the current day and the previous 15 days). The VNP43 algorithm uses the RossThick/Li-Sparse-Reciprocal (RTLSR) semi-empirical kernel-driven BRDF model, with the three kernel weights from VNP43IA1N to reconstruct surface anisotropic effects, correcting the directional reflectance to a common view geometry (VNP43IA4N), while also computing integrated black-sky albedo (BSA) at local solar noon and white-sky albedo (WSA) (VNP43IA3N). Researchers can use the BRDF model parameters with a simple polynomial, to obtain black-sky albedo at any solar illumination angle. Likewise, both the BSA and WSA Science Dataset (SDS) layers can be used with a simple polynomial, to manually estimate instantaneous actual albedo (blue-sky albedo). Additional details regarding the methodology are available in the Algorithm Theoretical Basis Document (ATBD) at https://www.umb.edu/editor_uploads/images/school_for_the_environment_cs/Viirs/VIIRS_ATBD_Apr_Jul2017.pdfThe VNP43IA3N product provides a total of 9 SDS layers including: BSA, WSA, and mandatory quality layers for VIIRS imagery bands I1, I2, and I3.", "distribution": [{"@type": "dcat:Distribution", "downloadURL": "https://nrt3.modaps.eosdis.nasa.gov/archive/allData/5200/VNP43IA3N/", "format": "BIN", "mediaType": "application/octet-stream", "title": "Data Information (Unknown Format)"}, {"@type": "dcat:Distribution", "downloadURL": "https://earthdata.nasa.gov/earth-observation-data/near-real-time/download-nrt-data/viirs-nrt", "format": "BIN", "mediaType": "application/octet-stream", "title": "Data Information (Unknown Format)"}], "identifier": "10.5067/VIIRS/VNP43IA3N.002", "keyword": ["earth-science-surface-radiative-properties-land-surface-albedo", "earth-science-surface-radiative-properties-land-surface-anisotropy"], "landingPage": "https://nrt3.modaps.eosdis.nasa.gov/archive/allData/5200/VNP43IA3N/", "modified": "2026-02-03", "programCode": ["026:000"], "publisher": {"@type": "org:Organization", "name": "NASA/GSFC/SED/ESD/TISL/MODAPS"}, "spatial": "[\"CARTESIAN\",[{\"NorthBoundingCoordinate\":80,\"WestBoundingCoordinate\":-180,\"EastBoundingCoordinate\":180,\"SouthBoundingCoordinate\":-80}]]", "temporal": "2023-11-20/2023-11-20", "theme": ["Earth Science"], "title": "VIIRS/NPP Albedo Daily L3 Global 500m SIN Grid NRT"}