Topography affects magnitude of energy reflected from the terrain to the sensor. which causes radiometric distortion in satellite data. Because of different topographic conditions, same objects show different brightness values in the image. For this reason, especially in mountainous regions. accuracy result of image c\assifications is affected negatively. In this study, effects that appear on satellite data due to topographical differences and position of the sun during the data collection were investigated. Furthermore. common topographic correction methods were also explained.