MCD43A1 v006

MODIS/Terra and 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 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 BRDF (MCD43A4) products.

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 quality layers for each of the 10 bands.

Characteristics

Improvements/Changes from Previous Versions

  • Observations are weighted to estimate the BRDF/Albedo on the ninth day of the 16-day period.
  • MCD43 products use the snow status weighted to the ninth day instead of the majority snow/no-snow observations from the 16-day period.
  • Better quality at high latitudes from use of all available observations for the acquisition period. Collection 5 used only four observations per day.
  • The MCD43 products use L2G-lite surface reflectance as input.
  • When there are insufficient high quality reflectances, a database with archetypal BRDF parameters is used to supplement the observational data and perform a lower quality magnitude inversion. This database is continually updated with the latest full inversion retrieval for each pixel.

Product Maturity

The MODIS BRDF/ALBEDO products have achieved stage 3 validation.

Collection and Granule

Collection

Characteristic Description
CollectionCombined MODIS
DOI10.5067/MODIS/MCD43A1.006
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), Band 6 is fill value due to non-functional or noisy detectors
3 Processed, see other QA (magnitude BRDF inversions), Band 6 is fill due to non-functional or noisy detectors
255 Fill Value

Known Issues

For complete information about the MCD43A1 known issues refer to the MODIS Land Quality Assessment website.

Documentation

Using the Data

Data In Action

Predicting Wind Erosion in Australia using MODIS BRDF/Albedo Data

Tools

Citation

DOI: 10.5067/MODIS/MCD43A1.006

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