lambertain_surface

Bidirectional reflectance geometry diagram showing the angular relationships in remote sensing measurements. The hemisphere represents the viewing dome with zenith at top and cardinal directions marked. Various angles (θs, θD, θR) and vectors (RT, RD, RR) illustrate the relationships between incoming light source, surface reflection point, and observation direction. This framework is essential for understanding how surface reflectance varies with illumination and viewing geometry in satellite remote sensing applications.