I am trying to add height to a DEM. I have a polygon and I would like to raise this area of the DEM by 10m. I have tried many things but nothing seems to work. I am going to use the polygon to run another viewshed. The first viewshed that I ran was a bare earth model. Now I want to add in height in one area, which I have a polygon for, so that I can see how much of a difference that makes in my viewshed.