VNP43D40 v001

VIIRS/NPP BRDF/Albedo Quality Daily L3 Global 30 ArcSec CMG

PI: Crystal Schaaf


The NASA/NOAA Suomi National Polar-orbiting Partnership (Suomi NPP) Visible Infrared Imaging Radiometer Suite (VIIRS) Bidirectional Reflectance Distribution Function (BRDF) and Albedo Quality product (VNP43D40) 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 for each of the parameters included in the VNP43MA2 product. VNP43D40 through VNP43D53 are the 30 arc second BRDF/Albedo Quality values, the Local Solar Noon values, the Valid Observations of the moderate resolution bands (M1 through M5, M7, M8, M10, and M11) plus the Day/Night Band (DNB), the Snow Status, and the Uncertainty. Details regarding methodology are available on the VNP43MA2 product page and in the Algorithm Theoretical Basis Document (ATBD).

VNP43D40 consists of BRDF/Albedo quality information representing the overall quality of each pixel for VIIRS moderate resolution bands M1 through M5, M7, M8, M10, M11, and DNB.

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Product Maturity

Validation at stage 3 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


Characteristic Description
CollectionSuomi NPP VIIRS
File Size~400 MB
Temporal ResolutionDaily
Temporal Extent2012-01-19 to Present
Spatial ExtentGlobal
Coordinate SystemGeographic Latitude and Longitude
File FormatHDF-EOS5
Geographic DimensionsGlobal


Characteristic Description
Number of Science Dataset (SDS) Layers10
Columns/Rows43200 x 21600
Pixel Size1000 m

Layers / Variables

SDS Name Description Units Data Type Fill Value No Data Value Valid Range Scale Factor
BRDF_Albedo_Band_Quality_M1 BRDF/Albedo Quality for Band M1 (0.402 - 0.422 μm) N/A 8-bit unsigned integer 255 N/A 0 to 3 N/A
BRDF_Albedo_Band_Quality_M2 BRDF/Albedo Quality for Band M2 (0.436 - 0.454 μm) N/A 8-bit unsigned integer 255 N/A 0 to 3 N/A
BRDF_Albedo_Band_Quality_M3 BRDF/Albedo Quality for Band M3 (0.478 - 0.498 μm) N/A 8-bit unsigned integer 255 N/A 0 to 3 N/A
BRDF_Albedo_Band_Quality_M4 BRDF/Albedo Quality for Band M4 (0.545 - 0.565 μm) N/A 8-bit unsigned integer 255 N/A 0 to 3 N/A
BRDF_Albedo_Band_Quality_M5 BRDF/Albedo Quality for Band M5 (0.662 - 0.682 μm) N/A 8-bit unsigned integer 255 N/A 0 to 3 N/A
BRDF_Albedo_Band_Quality_M7 BRDF/Albedo Quality for Band M7 (0.846 - 0.885 μm) N/A 8-bit unsigned integer 255 N/A 0 to 3 N/A
BRDF_Albedo_Band_Quality_M8 BRDF/Albedo Quality for Band M8 (1.230 - 1.250 μm) N/A 8-bit unsigned integer 255 N/A 0 to 3 N/A
BRDF_Albedo_Band_Quality_M10 BRDF/Albedo Quality for Band M10 (1.580 - 1.640 μm) N/A 8-bit unsigned integer 255 N/A 0 to 3 N/A
BRDF_Albedo_Band_Quality_M11 BRDF/Albedo Quality for Band M11 (2.225 - 2.275 μm) N/A 8-bit unsigned integer 255 N/A 0 to 3 N/A
BRDF_Albedo_Band_Quality_DNB BRDF/Albedo Quality for Day/Night Band (0.5 - 0.9 μm) N/A 8-bit unsigned integer 255 N/A 0 to 3 N/A

BRDF/Albedo Band Quality description

Value Description
0 Best quality, full inversion (Weight of Determination (WoDs), Root Mean Square Error (RMSE) majority good)
1 Good quality, full inversion
2 Magnitude inversion (number of observations ≥ 7)
3 Magnitude inversion (number of observations ≥ 2 & < 7)
255 Fill value

Product Quality

Product accuracy/uncertainty information for the VIIRS BRDF/Albedo product suite can be found in section 4 of the ATBD.

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.

About the image

VIIRS BRDF/Albedo Quality data from the VNP43D40 product across the globe on January 1, 2017.

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User Guide
Algorithm Theoretical Basis Document (ATBD)
File Specification

Using the Data

Access Data


DOI: 10.5067/VIIRS/VNP43D40.001