VIIRS/NPP BRDF/Albedo WSA at Solar Noon NIR Daily L3 Global 30ArcSec CMG V001

Description

The VNP43D77 Version 1 data product was decommissioned on July 31, 2025. Users are encouraged to use the [VNP43D77](https://doi.org/10.5067/VIIRS/VNP43D77.002) and [VJ143D77](https://doi.org/10.5067/VIIRS/VJ143D77.002) Version 2 data products.The NASA/NOAA Suomi National Polar-orbiting Partnership (Suomi NPP) Visible Infrared Imaging Radiometer Suite (VIIRS) Bidirectional Reflectance Distribution Function (BRDF) and Albedo white-sky albedo for band NIR (VNP43D77) is produced daily using 16 days of data at 30 arc second (1,000 meter) resolution. Data are temporally weighted to the ninth day, which is reflected in the file name. The VNP43D product suite is provided in a Climate Modeling Grid (CMG), which covers the entire globe for use in climate simulation models. Due to the large file size, each VNP43D product contains just one data layer. VNP43D54 through VNP43D79 are the albedo products of the VNP43D BRDF/Albedo product suite. Black-sky albedo (BSA) and white-sky albedo (WSA) values are provided for the nine VIIRS moderate resolution bands (M1 through M5, M7, M8, M10, and M11) along with the visible, near-infrared (NIR), and shortwave bands included in the [VNP43MA3](https://doi.org/10.5067/VIIRS/VNP43MA3.001) product. In addition to the bands included in VNP43MA3, this product suite includes albedo values for the VIIRS Day/Night Band (DNB). The black-sky albedo (directional hemispherical reflectance) is defined as albedo in the absence of a diffuse component and is a function of solar zenith angle. White-sky albedo (bihemispherical reflectance) is defined as albedo in the absence of a direct component when the diffuse component is isotropic. Details regarding methodology are available on the [VNP43MA3](https://doi.org/10.5067/VIIRS/VNP43MA3.001) product page and in the Algorithm Theoretical Basis Document (ATBD).VNP43D77 is the WSA for the VIIRS NIR broadband (0.865 μm).Known Issues* The abnormally high activation of the high aerosol flag in the Collection 1 (C1) VNP09 product has impacted downstream products. The VNP43 BRDF/Albedo/NBAR product is affected by reducing the number of otherwise acceptable observations used as input to characterize surface anisotropy. This effect (most obvious over arid bright surfaces), results in a reduced number of high quality full BRDF model inversions. Therefore, users should be aware that bright arid surfaces (normally associated with high quality BRDF/Albedo/NBAR retrievals) are likely to be somewhat represented by lower quality results in C1. VNP09 has been corrected for Collection 2 (C2). Therefore, users should avoid substantive use of C1 VNP43 over arid regions (and wait for C2 products). In any event, users are **always strongly encouraged** to download and use the extensive QA data provided in VNP43[I-M]A2, in addition to the briefer mandatory QA provided as part of the VNP43[I-M]A1, 3 and 4 products.* For complete information about known issues please refer to the [MODIS/VIIRS Land Quality Assessment website](https://landweb.modaps.eosdis.nasa.gov/knownissue?sensor=VIIRS).

Resources

Name Format Description Link
5 https://landweb.modaps.eosdis.nasa.gov%2F
5 https://doi.org%2F10.5067%2FVIIRS%2FVNP43D77.001
5 https://e4ftl01.cr.usgs.gov%2FVIIRS%2FVNP43D77.001%2F
5 https://lpdaac.usgs.gov%2F
5 https://search.earthdata.nasa.gov%2Fsearch%3Fq%3DC1607351143-LPDAAC_ECS
5 https://opendap.cr.usgs.gov%2Fopendap%2Fhyrax%2FVNP43D77.001%2Fcontents.html
5 https://www.umb.edu%2Fspectralmass%2Fviirs-user-guides-c1-and-c2%2Fvnp43d-cmg-30-arc-second-products%2F
5 https://lpdaac.usgs.gov%2Fdocuments%2F194%2FVNP43_ATBD_V1.pdf
5 https://ladsweb.modaps.eosdis.nasa.gov%2Ffilespec%2FVIIRS%2F1%2FVNP43D77
5 https://viirsland.gsfc.nasa.gov%2FVal%2FAlbedo_Val.html
5 https://viirsland.gsfc.nasa.gov%2FVal_overview.html
5 https://www.earthdata.nasa.gov%2Fcenters%2Flp-daac

Tags

  • earth-science-surface-radiative-properties-land-surface-reflectance
  • earth-science-surface-radiative-properties-land-surface-anisotropy
  • earth-science-surface-radiative-properties-land-surface-albedo

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