MCD43A4 v061

MODIS/Terra+Aqua Nadir BRDF-Adjusted Reflectance (NBAR) Daily L3 Global 500 m SIN Grid


PI: Crystal Schaaf

Historic processing continues for MODIS V6.1 data products for years 2011 through 2018. It is the intent to complete processing of the archive by the end of the 2021 calendar year. The V6 land products will be available until the V6.1 processing is completed, upon which time the MODIS V6 products will be decommissioned.

Description

The Moderate Resolution Imaging Spectroradiometer (MODIS) MCD43A4 Version 6.1 Nadir Bidirectional Reflectance Distribution Function (BRDF)-Adjusted Reflectance (NBAR) dataset is produced daily using 16 days of Terra and Aqua MODIS data at 500 meter (m) resolution. The view angle effects are removed from the directional reflectances, resulting in a stable and consistent NBAR product. Data are temporally weighted to the ninth day which is reflected in the Julian date in the file name.

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 MCD43A4 provides NBAR and simplified mandatory quality layers for MODIS bands 1 through 7. Essential quality information provided in the corresponding MCD43A2 data file should be consulted when using this product.

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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/MCD43A4.061
File Size~21 MB
Temporal ResolutionDaily
Temporal Extent2000-02-16 to Present
Spatial ExtentGlobal
Coordinate SystemSinusoidal
DatumN/A
File FormatHDF-EOS
Geographic Dimensions1200 km x 1200 km

Granule

Characteristic Description
Number of Science Dataset (SDS) Layers14
Columns/Rows2400 x 2400
Pixel Size~500 m

Layers

SDS Name Description Units Data Type Fill Value No Data Value Valid Range Scale Factor
BRDF_Albedo_Band_Mandatory_Quality_Band1 BRDF Albedo Mandatory Quality for Band 1 Bit Field 8-bit unsigned integer 255 N/A 0 to 254 N/A
BRDF_Albedo_Band_Mandatory_Quality_Band2 BRDF Albedo Mandatory Quality for Band 2 Bit Field 8-bit unsigned integer 255 N/A 0 to 254 N/A
BRDF_Albedo_Band_Mandatory_Quality_Band3 BRDF Albedo Mandatory Quality for Band 3 Bit Field 8-bit unsigned integer 255 N/A 0 to 254 N/A
BRDF_Albedo_Band_Mandatory_Quality_Band4 BRDF Albedo Mandatory Quality for Band 4 Bit Field 8-bit unsigned integer 255 N/A 0 to 254 N/A
BRDF_Albedo_Band_Mandatory_Quality_Band5 BRDF Albedo Mandatory Quality for Band 5 Bit Field 8-bit unsigned integer 255 N/A 0 to 254 N/A
BRDF_Albedo_Band_Mandatory_Quality_Band6 BRDF Albedo Mandatory Quality for Band 6 Bit Field 8-bit unsigned integer 255 N/A 0 to 254 N/A
BRDF_Albedo_Band_Mandatory_Quality_Band7 BRDF Albedo Mandatory Quality for Band 7 Bit Field 8-bit unsigned integer 255 N/A 0 to 254 N/A
Nadir_Reflectance_Band1 NBAR at local solar noon for Band 1 N/A 16-bit signed integer 32767 N/A 0 to 32766 0.0001
Nadir_Reflectance_Band2 NBAR at local solar noon for Band 2 N/A 16-bit signed integer 32767 N/A 0 to 32766 0.0001
Nadir_Reflectance_Band3 NBAR at local solar noon for Band 3 N/A 16-bit signed integer 32767 N/A 0 to 32766 0.0001
Nadir_Reflectance_Band4 NBAR at local solar noon for Band 4 N/A 16-bit signed integer 32767 N/A 0 to 32766 0.0001
Nadir_Reflectance_Band5 NBAR at local solar noon for Band 5 N/A 16-bit signed integer 32767 N/A 0 to 32766 0.0001
Nadir_Reflectance_Band6 NBAR at local solar noon for Band 6 N/A 16-bit signed integer 32767 N/A 0 to 32766 0.0001
Nadir_Reflectance_Band7 NBAR at local solar noon for Band 7 N/A 16-bit signed integer 32767 N/A 0 to 32766 0.0001

Mandatory Quality bit index

Value Description
0 Processed, good quality (full BRDF inversions)
1 Processed, see other QA (magnitude BRDF inversions)
255 Fill Value

Known Issues

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


About the image

Combined MODIS nadir reflectance bands 1-4-3 data from the MCD43A4 product over western United States June 7 - 22, 2020.

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Documentation

User Guide
Algorithm Theoretical Basis Document (ATBD)
File Specification

Using the Data

Access Data

Citation

DOI: 10.5067/MODIS/MCD43A4.061