Abstract
The luminance of a shadowed area is measured using cardboard prism models. It is constant when the incident angles are different, and independent of the slope angle of the cardboard prism when the incident angle is constant. These phenomena as well as the generation of shadow are called as shadowing effects. It is confirmed that the spectral distribution of the skylight reflected from the cardborad prism corresponds to that of Rayleigh scattering. Finally, the shadowing effects are applied to the Landsat MSS data.
