MCD43A1 v061

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


PI: Crystal Schaaf

Description

The Moderate Resolution Imaging Spectroradiometer (MODIS) MCD43A1 Version 6.1 Bidirectional Reflectance Distribution Function and Albedo (BRDF/Albedo) Model Parameters 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 retrieval period which is reflected in the Julian date in the file name. MCD43A1 provides the three model weighting parameters (isotropic, volumetric, and geometric) used to derive the Albedo (MCD43A3) and Nadir BRDF-Adjusted Reflectance (NBAR) (MCD43A4) 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 MCD43A1 provides the three model weighting parameters for MODIS spectral bands 1 through 7 as well as the visible, near infrared (NIR), and shortwave bands. Along with the three-dimensional parameter layers for these bands are the simplified mandatory quality layers for each of the 10 bands. 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/MCD43A1.061
File Size~55 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) Layers20
Columns/Rows2400 x 2400
Pixel Size500 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
BRDF_Albedo_Band_Mandatory_Quality_vis BRDF Albedo Mandatory Quality for vis broadband Bit Field 8-bit unsigned integer 255 N/A 0 to 254 N/A
BRDF_Albedo_Band_Mandatory_Quality_nir BRDF Albedo Mandatory Quality for NIR broadband Bit Field 8-bit unsigned integer 255 N/A 0 to 254 N/A
BRDF_Albedo_Band_Mandatory_Quality_shortwave BRDF Albedo Mandatory Quality for shortwave broadband Bit Field 8-bit unsigned integer 255 N/A 0 to 254 N/A
BRDF_Albedo_Parameters_Band1 3D Parameter (iso, vol, geo) for Band 1 N/A 16-bit signed integer 32767 N/A 0 to 32766 0.001
BRDF_Albedo_Parameters_Band2 3D Parameter (iso, vol, geo) for Band 2 N/A 16-bit signed integer 32767 N/A 0 to 32766 0.001
BRDF_Albedo_Parameters_Band3 3D Parameter (iso, vol, geo) for Band 3 N/A 16-bit signed integer 32767 N/A 0 to 32766 0.001
BRDF_Albedo_Parameters_Band4 3D Parameter (iso, vol, geo) for Band 4 N/A 16-bit signed integer 32767 N/A 0 to 32766 0.001
BRDF_Albedo_Parameters_Band5 3D Parameter (iso, vol, geo) for Band 5 N/A 16-bit signed integer 32767 N/A 0 to 32766 0.001
BRDF_Albedo_Parameters_Band6 3D Parameter (iso, vol, geo) for Band 6 N/A 16-bit signed integer 32767 N/A 0 to 32766 0.001
BRDF_Albedo_Parameters_Band7 3D Parameter (iso, vol, geo) for Band 7 N/A 16-bit signed integer 32767 N/A 0 to 32766 0.001
BRDF_Albedo_Parameters_vis 3D Parameter (iso, vol, geo) for vis broadband N/A 16-bit signed integer 32767 N/A 0 to 32766 0.001
BRDF_Albedo_Parameters_nir 3D Parameter (iso, vol, geo) for NIR broadband N/A 16-bit signed integer 32767 N/A 0 to 32766 0.001
BRDF_Albedo_Parameters_shortwave 3D Parameter (iso, vol, geo) for shortwave broadband N/A 16-bit signed integer 32767 N/A 0 to 32766 0.001

Mandatory Quality bit index

Value Description
0 Processed, good quality (full BRDF inversions)
1 Processed, see other QA (magnitude BRDF inversions)
2 Processed, good quality (full BRDF inversions, only Band 6 is fill value due to non-functional or noisy detectors)
3 Processed, see other QA (magnitude BRDF inversions, only Band 6 is fill value due to non-functional or noisy detectors)
4 Processed, good quality (full BRDF inversions, only Band 5 is fill value due to non-functional or noisy detectors)
5 Processed, see other QA (magnitude BRDF inversions, only Band 5 is fill value due to non-functional or noisy detectors)
6 Processed, good quality (full BRDF inversions, both Band 5 and Band 6 are fill value due to non-functional or noisy detectors)
7 Processed, see other QA (magnitude BRDF inversions, both Band 5 and Band 6 are fill value due to non-functional or noisy detectors)
255 Fill Value

Known Issues

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

Documentation

Using the Data

Access Data

Citation

DOI: 10.5067/MODIS/MCD43A1.061

About the Image

Combined MODIS BRDF Albedo Parameters 1-4-3 data from the MCD43A1 product over western United States June 7 - 22, 2020.

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