VIIRS/NPP BRDF/Albedo Model Parameters Daily L3 Global 500m SIN Grid V001

Description

The NASA/NOAA Suomi National Polar-orbiting Partnership (Suomi NPP) Visible Infrared Imaging Radiometer Suite (VIIRS) Bidirectional Reflectance Distribution Function (BRDF) and Albedo Model Parameters (VNP43IA1) Version 1 product provides kernel weights (parameters) at 500 meter (m) resolution. The VNP43IA1 product is produced daily using 16 days of VIIRS data, temporally weighted to the ninth day, which is reflected in the file name. The VNP43IA1 product provides three spectrally dependent kernel weights, also known as model parameters: isotropic (fiso), volumetric (fvol), and geometric (fgeo), which can be used to model anisotropic effects of the Earth’s surface. All VNP43 data products are designed to promote the continuity of NASA’s Moderate Resolution Imaging Spectroradiometer (MODIS) BRDF/Albedo data product suite. The VNP43 algorithm uses the RossThick/Li-Sparse-Reciprocal (RTLSR) semi-empirical kernel-driven BRDF model, with the three kernel weights from VNP43IA1 to reconstruct surface anisotropic effects, correcting the directional reflectance to a common view geometry (VNP43IA4) (https://doi.org/10.5067/VIIRS/VNP43IA4.001), while also computing integrated black-sky albedo (BSA) at local solar noon and white-sky albedo (WSA) (VNP43IA3) (https://doi.org/10.5067/VIIRS/VNP43IA3.001). 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) (https://lpdaac.usgs.gov/documents/194/VNP43_ATBD_V1.pdf). The VNP43IA1 data product provides a total of six SDS layers including: mandatory quality bands and three multi-dimensional model parameter bands representing fiso, fvol, and fgeo of the VIIRS imagery bands: I1, I2, and I3. Each data product file is provided in HDF-EOS5 format. A low-resolution browse is also available showing BRDF/Albedo parameters for VIIRS imagery bands: I1, I2, and I1 as an RGB (red, green, blue) image in JPEG format.

Resources

Name Format Description Link
21 Search results for publications that cite this dataset by its DOI. https://scholar.google.com/scholar?q=10.5067%2FVIIRS%2FVNP43IA1.001+
21 The Application for Extracting and Exploring Analysis Ready Samples (AρρEEARS) offers a simple and efficient way to perform data access and transformation processes. https://appeears.earthdatacloud.nasa.gov/
21 Further details regarding VIIRS product validation and maturity status are available from VIIRS Land Product Quality Assessment site. https://viirsland.gsfc.nasa.gov/Val_overview.html
21 The LP DAAC product page provides information on Science Data Set layers and links for user guides, ATBDs, data access, tools, customer support, etc. https://doi.org/10.5067/VIIRS/VNP43IA1.001
21 The technical information in the User's Guide enables users to interpret and use the data products. https://www.umb.edu/spectralmass/viirs-user-guide/vnp43ia1-and-vnp43ma1-brdf-albedo-model-parameters/
20 LP DAAC Data Pool provides direct access to available products via HTTPS. https://e4ftl01.cr.usgs.gov/VIIRS/VNP43IA1.001/
21 The File Specification provides a description of the product file including Scientific Data Sets and their attributes. https://ladsweb.modaps.eosdis.nasa.gov/filespec/VIIRS/1/VNP43IA1
21 Quality Assessment provides information regarding the usability and usefulness of the data product. https://landweb.modaps.eosdis.nasa.gov/NPP_QA/
21 The LP DAAC website provides detailed information on discovery, distribution, access, and support of land data products. https://lpdaac.usgs.gov/
20 Earthdata Search allows users to search, discover, visualize, refine, and access NASA Earth Observation data. https://search.earthdata.nasa.gov/search?q=C1407099489-LPDAAC_ECS
33 The ATBD provides physical theory and mathematical procedures for the calculations used to produce the data products. https://lpdaac.usgs.gov/documents/194/VNP43_ATBD_V1.pdf
21 Access data via Open-source Project for a Network Data Access Protocol. https://opendap.cr.usgs.gov/opendap/hyrax/DP102/VIIRS/VNP43IA1.001/contents.html
21 Browse image for Earthdata Search https://e4ftl01.cr.usgs.gov/WORKING/BRWS/Browse.001/2019.07.02/BROWSE.VNP43IA1.A2019175.h12v11.001.2019183070621.1.jpg?_ga=2.141902834.116070394.1561987039-1109527761.1561753117
21 Validation at stage 2 has been achieved for the VIIRS BRDF/Albedo product suite. https://viirsland.gsfc.nasa.gov/Val/Albedo_Val.html

Tags

  • land-surface
  • surface-radiative-properties
  • earth-science

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