Short Name:
MCD43D44

MODIS/Terra+Aqua BRDF/Albedo Black Sky Albedo Band3 Daily L3 Global 30ArcSec CMG V006

The MCD43D44 Version 6 Bidirectional Reflectance Distribution Function and Albedo (BRDF/Albedo) Black Sky Albedo Band 3 data set is a daily 16-day product. This product incorporates the Climate Modeling Grid (CMG) structure in which each file geographically covers the entire earth rather than the 10 degree x 10 degree latitude and longitude tiling system utilized by the standard MODIS land products. Unlike the standard CMG pixel resolution of 5600 meters the MCD43D products are 1000 meters, so consequently, because of the large file size each product contains just one layer. The Julian date in the granule ID of each specific file represents the 9th day of the 16 day composite period, and consequently the observations are weighted to estimate the values for that day. The MCD43D42 through MCD43D61 are the Albedo products of the MCD43D BRDF/Albedo product suite. There are 10 black sky albedo bands and 10 white sky Albedo bands representing MODIS bands 1-7 and three broadbands, visible, near infrared, and shortwave. The Black sky albedo (directional hemispherical reflectance) is defined as albedo in the absence of a diffuse component and is a function of solar zenith angle. White sky albedo (bihemispherical reflectance) is defined as albedo in the absence of a direct component when the diffuse component is isotropic. The MCD43D44 is the black sky albedo for MODIS band 3. The MODIS BRDF/ALBEDO products have achieved stage 3 validation. 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. * 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.

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