I need to adjust a DEM (raster) and I was wondering if the Raster Calculator is the right tool to use, and how?
I’m modelling floods in Xochimilco (Mexico) and via OpenStreetMap I have acquired the shapefile of water bodies. This shapefile I have converted to a raster with the same dimensions as the Digital Elevation Model: both rasters have the same projection and the same cell size (10x10).
I figure that the I should assign the water raster a ‘value’ of 1, and then the formula in Raster Calculator would be [Original DEM – Water Raster = New DEM].
What steps should I take?