DEM Difference Maps
Select from the Raster GIS menu, Multiple grid arithmetic.
DEM difference maps will be drawn in one of two ways:
Think about do you want a positive difference to mean. Along the coast or a river, or a landslide, this could be erosion or deposition, or it could be additon of a new building or tearing down an old building, or growth of trees, or loss of trees due to a fire.
The order of selecting the two DEM will determine the sign of the result. The second DEM will be subtracted from the first. The title of the map will show the order of the subtraction. If you want to control the resolution of the grid, you can change the sign of the results using Single grid arithmetic on the Edit menu and multiply by -1.
|You can get:
Last revision 5/28/2020