MCD43A4 v006

MODIS/Terra and Aqua Nadir BRDF-Adjusted Reflectance Daily L3 Global 500 m SIN Grid


PI: Crystal Schaaf

Description

The Moderate Resolution Imaging Spectroradiometer (MODIS) MCD43A4 Version 6 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.

The MCD43A4 provides NBAR and quality layers for MODIS bands 1 through 7.

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/MCD43A4.006
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 Additional Offset
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 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 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 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 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 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 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 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 N/A
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 N/A
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 N/A
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 N/A
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 N/A
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 N/A
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 N/A

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 the MCD43A4 known issues refer to the MODIS Land Quality Assessment website.

Documentation

Using the Data

Data In Action

Autumn Foliage in Eastern Asia: A View from Space

Highlights from the Literature: October to December 2017

Highlights from the Literature: January to March 2016

Tools

Citation

DOI: 10.5067/MODIS/MCD43A4.006

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