VNP43MA1 v001

VIIRS/NPP BRDF/Albedo Model Parameters Daily L3 Global 1 km SIN Grid


PI: Crystal Schaaf

Description

The Suomi National Polar-Orbiting Partnership (S-NPP) NASA Visible Infrared Imaging Radiometer Suite (VIIRS) Bidirectional Reflectance Distribution Function (BRDF) and Albedo Model Parameters (VNP43MA1) Version 1 product provides BRDF/Albedo model parameters at 1 kilometer (km) resolution. The VNP43MA1 product is produced daily using 16 days of VIIRS data and is weighted temporally to the ninth day, which is reflected in the file name. The 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 VNP43MA1 to reconstruct surface anisotropic effects, correcting the directional reflectance to a common view geometry (VNP43MA4), while also computing integrated black-sky albedo (BSA) at local solar noon and white-sky albedo (WSA) (VNP43MA3). 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).

The VNP43MA1 data product provides a total of 24 SDS layers including: mandatory quality bands and three multi-dimensional model parameter bands representing fiso, fvol, and fgeo for VIIRS moderate resolution bands: M1-M5, M7-M8, and M10-M11. A low-resolution browse is also provided showing BRDF/Albedo parameters for bands M5, M4, and M3 as a red, green, blue (RGB) image in JPEG format.

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Characteristics

Product Maturity

Validation at stage 1 has been achieved for the VIIRS BRDF/Albedo product suite. Visit the VIIRS Land Product Quality Assessment website for additional information on validation and product maturity status.

Collection and Granule

Collection

Characteristic Description
CollectionS-NPP VIIRS
DOI10.5067/VIIRS/VNP43MA1.001
File Size~19 MB
Temporal ResolutionDaily
Temporal Extent2012-01-19 to Present
Spatial ExtentGlobal
Coordinate SystemSinusoidal
DatumN/A
File FormatHDF-EOS5
Geographic Dimensions1200 km x 1200 km

Granule

Characteristic Description
Number of Science Dataset (SDS) Layers24
Columns/Rows1200 x 1200
Pixel Size1000 m

Layers

SDS Name Description Units Data Type Fill Value No Data Value Valid Range Scale Factor
BRDF_Albedo_Band_Mandatory_Quality_M1 BRDF/Albedo mandatory quality for band M1 N/A 8-bit unsigned integer 255 N/A 0 to 1 N/A
BRDF_Albedo_Band_Mandatory_Quality_M10 BRDF/Albedo mandatory quality for band M10 N/A 8-bit unsigned integer 255 N/A 0 to 1 N/A
BRDF_Albedo_Band_Mandatory_Quality_M11 BRDF/Albedo mandatory quality for band M11 N/A 8-bit unsigned integer 255 N/A 0 to 1 N/A
BRDF_Albedo_Band_Mandatory_Quality_M2 BRDF/Albedo mandatory quality for band M2 N/A 8-bit unsigned integer 255 N/A 0 to 1 N/A
BRDF_Albedo_Band_Mandatory_Quality_M3 BRDF/Albedo mandatory quality for band M3 N/A 8-bit unsigned integer 255 N/A 0 to 1 N/A
BRDF_Albedo_Band_Mandatory_Quality_M4 BRDF/Albedo mandatory quality for band M4 N/A 8-bit unsigned integer 255 N/A 0 to 1 N/A
BRDF_Albedo_Band_Mandatory_Quality_M5 BRDF/Albedo mandatory quality for band M5 N/A 8-bit unsigned integer 255 N/A 0 to 1 N/A
BRDF_Albedo_Band_Mandatory_Quality_M7 BRDF/Albedo mandatory quality for band M7 N/A 8-bit unsigned integer 255 N/A 0 to 1 N/A
BRDF_Albedo_Band_Mandatory_Quality_M8 BRDF/Albedo mandatory quality for band M8 N/A 8-bit unsigned integer 255 N/A 0 to 1 N/A
BRDF_Albedo_Band_Mandatory_Quality_nir BRDF/Albedo mandatory quality for the NIR broadband N/A 8-bit unsigned integer 255 N/A 0 to 1 N/A
BRDF_Albedo_Band_Mandatory_Quality_shortwave BRDF/Albedo mandatory shortwave broadband N/A 8-bit unsigned integer 255 N/A 0 to 1 N/A
BRDF_Albedo_Band_Mandatory_Quality_vis BRDF/Albedo mandatory the visible broadband N/A 8-bit unsigned integer 255 N/A 0 to 1 N/A
BRDF_Albedo_Parameters_M1 Multi-dimensional layer for band M1 of parameters: fiso, fvol, and fgeo N/A 16-bit signed integer 32767 N/A 0 to 32766 0.001
BRDF_Albedo_Parameters_M10 Multi-dimensional layer for band M10 of parameters: fiso, fvol, and fgeo N/A 16-bit signed integer 32767 N/A 0 to 32766 0.001
BRDF_Albedo_Parameters_M11 Multi-dimensional layer for band M11 of parameters: fiso, fvol, and fgeo N/A 16-bit signed integer 32767 N/A 0 to 32766 0.001
BRDF_Albedo_Parameters_M2 Multi-dimensional layer for band M2 of parameters: fiso, fvol, and fgeo N/A 16-bit signed integer 32767 N/A 0 to 32766 0.001
BRDF_Albedo_Parameters_M3 Multi-dimensional layer for band M3 of parameters: fiso, fvol, and fgeo N/A 16-bit signed integer 32767 N/A 0 to 32766 0.001
BRDF_Albedo_Parameters_M4 Multi-dimensional layer for band M4 of parameters: fiso, fvol, and fgeo N/A 16-bit signed integer 32767 N/A 0 to 32766 0.001
BRDF_Albedo_Parameters_M5 Multi-dimensional layer for band M5 of parameters: fiso, fvol, and fgeo N/A 16-bit signed integer 32767 N/A 0 to 32766 0.001
BRDF_Albedo_Parameters_M7 Multi-dimensional layer for band M7 of parameters: fiso, fvol, and fgeo N/A 16-bit signed integer 32767 N/A 0 to 32766 0.001
BRDF_Albedo_Parameters_M8 Multi-dimensional layer for band M8 of parameters: fiso, fvol, and fgeo N/A 16-bit signed integer 32767 N/A 0 to 32766 0.001
BRDF_Albedo_Parameters_nir Multi-dimensional layer for the NIR broadband of parameters: fiso, fvol, and fgeo N/A 16-bit signed integer 32767 N/A 0 to 32766 0.001
BRDF_Albedo_Parameters_shortwave Multi-dimensional layer for the shortwave broadband of parameters: fiso, fvol, and fgeo N/A 16-bit signed integer 32767 N/A 0 to 32766 0.001
BRDF_Albedo_Parameters_vis Multi-dimensional layer for the visible broadband of parameters: fiso, fvol, and fgeo N/A 16-bit signed integer 32767 N/A 0 to 32766 0.001

Product Quality

Product Quality information can be found in the ATBD in Table 10 on page 24. Product accuracy/uncertainty information can be found in section 4 on pages 20-22. Additional quality information can be found in the VNP43MA2 data product.

Known Issues

There are no known issues.

Documentation

Using the Data

Access Data

Citation

DOI: 10.5067/VIIRS/VNP43MA1.001

About the Image

A RBG composite of the VNP43MA1 product over Southeastern Australia from October 29, 2018.

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