Steps for Site Suitability using Arc GIS 1. Put DEM data, clip it in your shape file, project raster 2. SLope calculation, Aspect calculation 3. Geoprocessing tool>Buffer> Settlement > River 4. Merge Settelement and River Buffer 5. Erase (Analysis tool) shape file (dhading) and erase feature-merge file 6. Raster Calculator-Slope Con("Slope"=90, "aspect"