MCD43A2 v061

MODIS/Terra+Aqua BRDF/Albedo Quality Daily L3 Global 500 m SIN Grid


PI: Crystal Schaaf

Description

The Moderate Resolution Imaging Spectroradiometer (MODIS) MCD43A2 Version 6.1 Bidirectional Reflectance Distribution Function and Albedo (BRDF/Albedo) Quality dataset is produced daily using 16 days of Terra and Aqua MODIS data at 500 meter (m) resolution. Data are temporally weighted to the ninth day of the 16-day retrieval period which is reflected in the Julian date in the file name. MCD43A2 contains the quality information for the corresponding MCD43A3 Albedo and MCD43A4 Nadir BRDF-Adjusted Reflectance (NBAR) products.

Users are urged to use the band specific quality flags to isolate the highest quality full inversion results for their own science applications as described in the User Guide.

The MCD43A2 contains BRDF/Albedo band quality (inversion information) and days of valid observation within the 16-day period for MODIS bands 1 through 7 along with land water type, snow BRDF albedo, local solar noon, platform, and BRDF/Albedo uncertainty.

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Characteristics

Improvements/Changes from Previous Versions

  • The Version 6.1 Level-1B (L1B) products have been improved by undergoing various calibration changes that include: changes to the response-versus-scan angle (RVS) approach that affects reflectance bands for Aqua and Terra MODIS, corrections to adjust for the optical crosstalk in Terra MODIS infrared (IR) bands, and corrections to the Terra MODIS forward look-up table (LUT) update for the period 2012 - 2017.
  • A polarization correction has been applied to the L1B Reflective Solar Bands (RSB).

Product Maturity

Validation at stage 3 has been achieved for all MODIS BRDF/Albedo products. Further details regarding MODIS land product validation for the MCD43 data products are available from the MODIS Land Team Validation site.

Collection and Granule

Collection

Characteristic Description
CollectionCombined MODIS
DOI10.5067/MODIS/MCD43A2.061
File Size~1 MB
Temporal ResolutionDaily
Temporal Extent2000-02-16 to Present
Spatial ExtentGlobal
Coordinate SystemSinusoidal
DatumN/A
File FormatHDF-EOS
Geographic Dimensions~1200 km x 1200 km

Granule

Characteristic Description
Number of Science Dataset (SDS) Layers19
Columns/Rows2400 x 2400
Pixel Size~500 m

Layers

SDS Name Description Units Data Type Fill Value No Data Value Valid Range Scale Factor
Snow_BRDF_Albedo Snow-free BRDF/Albedo retrieved Bit Field 8-bit unsigned integer 255 N/A 0 to 254 N/A
BRDF_Albedo_Platform BRDF Albedo Platform information Bit Field 8-bit unsigned integer 255 N/A 0 to 254 N/A
BRDF_Albedo_LandWaterType Land Water Type Bit Field 8-bit unsigned integer 255 N/A 0 to 254 N/A
BRDF_Albedo_LocalSolarNoon Solar Zenith Angle of Local Solar Noon Bit Field 8-bit unsigned integer 255 N/A 0 to 254 N/A
BRDF_Albedo_ValidObs_Band1 Valid Observation for Band 1 N/A 16-bit unsigned integer 0 N/A 1 to 65535 N/A
BRDF_Albedo_ValidObs_Band2 Valid Observation for Band 2 N/A 16-bit unsigned integer 0 N/A 1 to 65535 N/A
BRDF_Albedo_ValidObs_Band3 Valid Observation for Band 3 N/A 16-bit unsigned integer 0 N/A 1 to 65535 N/A
BRDF_Albedo_ValidObs_Band4 Valid Observation for Band 4 N/A 16-bit unsigned integer 0 N/A 1 to 65535 N/A
BRDF_Albedo_ValidObs_Band5 Valid Observation for Band 5 N/A 16-bit unsigned integer 0 N/A 1 to 65535 N/A
BRDF_Albedo_ValidObs_Band6 Valid Observation for Band 6 N/A 16-bit unsigned integer 0 N/A 1 to 65535 N/A
BRDF_Albedo_ValidObs_Band7 Valid Observation for Band 7 N/A 16-bit unsigned integer 0 N/A 1 to 65535 N/A
BRDF_Albedo_Band_Quality_Band1 BRDF Inversion Information for Band 1 Bit Field 8-bit unsigned integer 255 N/A 0 to 254 N/A
BRDF_Albedo_Band_Quality_Band2 BRDF Inversion Information for Band 2 Bit Field 8-bit unsigned integer 255 N/A 0 to 254 N/A
BRDF_Albedo_Band_Quality_Band3 BRDF Inversion Information for Band 3 Bit Field 8-bit unsigned integer 255 N/A 0 to 254 N/A
BRDF_Albedo_Band_Quality_Band4 BRDF Inversion Information for Band 4 Bit Field 8-bit unsigned integer 255 N/A 0 to 254 N/A
BRDF_Albedo_Band_Quality_Band5 BRDF Inversion Information for Band 5 Bit Field 8-bit unsigned integer 255 N/A 0 to 254 N/A
BRDF_Albedo_Band_Quality_Band6 BRDF Inversion Information for Band 6 Bit Field 8-bit unsigned integer 255 N/A 0 to 254 N/A
BRDF_Albedo_Band_Quality_Band7 BRDF Inversion Information for Band 7 Bit Field 8-bit unsigned integer 255 N/A 0 to 254 N/A
BRDF_Albedo_Uncertainty BRDF Albedo Uncertainty N/A 16-bit unsigned integer 32767 N/A 0 to 32766 0.001

Information for the Snow_BRDF_Albedo, BRDF_Albedo_Platform, BRDF_Albedo_LandWatertype, BRDF_Albedo_ValidObs_Band1 through 7, and BRDF_Albedo_Band_Quality_Band1 through 7 legends are available in the MCD43A2 File Specification.

Known Issues

For complete information about known issues please refer to the MODIS/VIIRS Land Quality Assessment website.

Documentation

User Guide
Algorithm Theoretical Basis Document (ATBD)
File Specification

Using the Data

Access Data

Citation

DOI: 10.5067/MODIS/MCD43A2.061

About the Image

Combined MODIS BRDF Albedo Valid Observations 1-4-3 data from the MCD43A2 product over western United States June 7 - 22, 2020.

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