In this paper

the compensated replacement method is used to process the mixed pixels in TM image on basis of linear mixing model in order to identify rocks in the area with vegatation cover. The spectral information of vegetation in one mixed pixel is replaced with that of non vegetation in the process. The pixels without vegetation information are not changed and the pixels with heavy vegetation information are masked. The effect of vegetation cover is quantitatively removed and non vegetation information in mixed pixels is strengthened with use of this method.