6.2. The albedo-estimation method based on bidirectional reflectance model inversion
6.2.1. Inversion of the bidirectional reflectance model and derivation of narrowband albedo
The most-recognized albedo retrieving algorithm currently in operation is the AMBRALS, which was proposed for MODIS BRDF/albedo product. The albedo calculation procedures of AMBRALS consists of three steps: (1) atmospheric correction is applied to the observed upward radiation at the top of the atmosphere to calculate the HDRF at the surface; (2) the kernel-driven model parameters are inverted by fitting clear-sky observations, and the BSA and WSA are obtained after the integration of the model-predicted BRDF; and (3) based on the solar radiation spectra and the ...
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