To my knowledge the "white-sky albedo" is the surface albedo corresponding to diffuse illumination while "black-sky albedo" corresponds to the direct illumination. I am confused with the term "Lambertian albedo" used in some radiative transfer models (e.g libRadtran). Is it the same with the "white-sky albedo"? If not, what is their difference?

  • $\begingroup$ Lambertian is more commonly used as an adjective to describe how an object reflects light, and is the definition of a perfectly diffuse reflector. Specifically, Lambertian reflection is isotropic with respect to luminance, and luminous intensity obeys Lambert's Cosine Law. 'Lambertian' and 'white-sky' both approximately mean 'diffuse', but it's unclear if the terms have the exact same technical meaning in the context of illumination. $\endgroup$ Jun 30 at 0:37


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