With a teacher for five years in the same area of the tiff format images using arcgis and envi image in the water, building land and bare land extraction and fusion analysis the change trend of the above three features in recent years, how to make, (I tried in envi using supervised classification to do but the image is loaded in the arcgis multiband but in envi load only a single black and white image) for the great spirit show the more detailed, the better