Method Used to Calculate Albedo from the MODIS Albedo Model Parameter Product MCD43A1
Albedo MCD43AThe ALBEDO data are based on the Terra and Aqua(Combined) MODIS BRDF / Albedo Model Parameter Product (MCD43A1). The primary BRDF model parameters from MCD43A1 are used in the following equations to calculate Black-sky, white-sky, and actual (blue-sky) albedo. We have used a solar zenith angle (szn) equal to local solar noon and an optical depth of 0.2 as default values in calculating these data files.
Black-sky Albedo = Parameters_01 + Parameters_02 * (-0.007574 + (-0.070987 * szn2) + (0.307588 * szn3)) + Parameters_03 * (-1.284909 + (-0.166314 * szn2) + (0.041840 * szn3))
White-sky Albedo = Parameters_01 + Parameters_02 * (0.189184) + Parameters_03 * (-1.377622)
Blue-sky (Actual) Albedo = White-sky Albedo * f(optical depth, solar zenith angle, aerosol type, band) + Black-sky Albedo * (1 - f(optical depth, solar zenith angle, aerosol type, band))
where
Parameters_01 corresponds to the MCD43A1 band "BRDF_Albedo_Parameters_nn.Num_Parameters_01",
Parameters_02 corresponds to the MCD43A1 band "BRDF_Albedo_Parameters_nn.Num_Parameters_02",
Parameters_03 corresponds to the MCD43A1 band "BRDF_Albedo_Parameters_nn.Num_Parameters_03"
for nn=vis (Band_08 Visible Broadband), nn=nir (Band_09 Near Infrared Broadand) and nn=shortwave (Band_10 Shortwave Broadband)
Additional information can be found on the LP DAAC Web site:
https://lpdaac.usgs.gov/lpdaac/products/modis_product_table/brdf_albedo_model_parameters/16_day_l3_global_500m/v5/combined
and at the BRDF Science Team Web site:
http://www-modis.bu.edu/brdf/userguide/index.html