MCD43D37 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.
• CMG Albedo is estimated using all the clear-sky observations within the 1,000 m grid for MCD43D as opposed to aggregating from the 500 m albedo.

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

Quality bit index

The quality layer is stored in an efficient bit-encoded manner. The unpack_sds_bits executable from the LDOPE Tools is available to the user community to help parse and interpret this layer.

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 will be implemented in Collection 6.1 reprocessing in 2020.

For complete information about MCD43D37 known issues refer to the MODIS Land Quality Assessment website.