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Albedo is related to reflection of solar radiation at a surface and therefore defined in terms of it, as the ratio of the reflected solar radiation to the incident solar radiation at the surface, i.e., Hr/Ho,in this chapter. It is assumed however that the reflected radiation, Hr, is both diffuse and specular in nature, that is, it is diffuse if the reflected radiation is uniform or isotropic in all angular directions, and specular if the surface of reflection is smooth with respect to the wavelength of the incident radiation such that the laws of reflection are satisfied (Igbal, 1983). It was said by Gutman (1988) that the observed albedo assumed that the radiation field is isotropic. The extraterrestrial radiation, Ho at the edge of the atmosphere, from the sun, is considered the incident solar radiation.

Surface Albedo Estimation and Variation Characteristics at a Tropical Station