Light reflected from the ground--Algorithm 1.41

These equations deal with the ground as a diffuse reflector. Specular reflection is given by algorithm 1.43.

a. Ground luminance, Lg

Input
Illuminance on the ground, Evg
Ground reflectance, rg

Equation

Source
General photometric theory

b. Illuminance on an inclined plane from ground-reflected light, Egk

Input
Ground luminance, Lg
Zenith angle from surface normal, q

Equation

Source
General photometric theory.


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