Conformity of an existing regressive model to reflection characteristics for pavement materials

Abstract

In calculation of lighting environment, it says that the material surface is usually supposed to be isotropic diffuse. However the actual material surface shows not it. In order to realize and calculate for lighting environment, it is necessary to use luminance factor on the surface of material. In this report, for several sorts of pavement material, we measured the luminance factor and made it revolve by the existing model. And we compared and examined them. The result is that the luminance factor revolved by the model is different from the measured luminance factor. So, we established that a materials surface is anisotropic diffuse.