I have a DEM that i am trying to burn streams into except that my streams are road side ditches. I have converted the polylines into to a raster and i am trying to to burn them in using raster calculator but when i minus the difference between the two the only thing that comes back is the ditch. See pictures attached [ATTACH=CONFIG]30123[/ATTACH][ATTACH=CONFIG]30124[/ATTACH]
Any idea for a quick fix?
Thank you ahead of time
Additional note: I know about arc hydro tool set but it converts my DEM to meters which wouldn't be a problem except we have 70+ DEM to work with and are trying to automate this processes as much as possible
I suspect non-ditch areas are classed as nodata. reclass that area to 0, then do the subtraction, otherwise you will end up with just the ditches
Thank you so much!
I ended up taking this one step further and Did a ISnull Function Then A Con Function to combine the DEMS.
For anyone interested i simply Did Isnull to my Ditches then did: [ATTACH=CONFIG]30126[/ATTACH] Null is the ISnull Raster DEM_q29... is the background DEM Ditch is the New Ditch that has been converted from a polyline to a Raster