MCD43A4 v006

• 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.

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.

Mandatory Quality bit index

The incorrect representation of the aerosol quantities (low average high) in the C6 MYD09 and MOD09 surface reflectance products may have impacted downstream products particularly over arid bright surfaces. This (and a few other issues) have been corrected for C6.1. Therefore users should avoid substantive use of the C6 MCD43 products and wait for the C6.1 products. In any event, users are always strongly encouraged to download and use the extensive QA data provided in MCD43A2, in addition to the briefer mandatory QAs provided as part of the MCD43A1, 3, and 4 products.

Corrections were implemented in Collection 6.1 reprocessing.

For complete information about the MCD43A4 known issues refer to the MODIS Land Quality Assessment website.