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Many earlier experiments have shown that reflection from rock surfaces depends upon surface roughness,in-cidence zenith angle,viewing zenith angle,incidence azimuth and viewing azimuth. However,no research exists show-ing the interaction effects of these variables. Using granite as a model surface,we have designed an orthogonal,two level test having seven factors. Analysis of variance shows that surface roughness,relative viewing azimuth,and the in-teraction between these two factors are the largest sources of variance in our experiment. Hence we should include the interaction term in reflection models of granite.
Many previous experiments have shown that reflection from rock surfaces depends upon surface roughness, in-cidence zenith angle, viewing zenith angle, incidence azimuth and viewing azimuth. However, no research exists show-ing the interaction effects of these variables. Using granite as a model of surface, we have designed an orthogonal, two level test having seven factors. Analysis of variance shows that surface roughness, relative viewing azimuth, and the in-teraction between these two factors are the largest sources of variance in our experiment. Therefore we should include the interaction term in reflection models of granite.