How can I subtract one shape file from the other? I have a shape file A, and want to subtract shape file B from it, to get the new shape file with polygon A-B. How can do I it in ArcGIS or erdas or envi..?
1) Create raster layer for each polygon with a reasonable cell size (same size for both). Give value of 1 for cell covered by polygon and zero outside polygon
2) Subtract both raster layers and the result is the required layer