Problem with Raster Calculator/burning streams

Anonymous User

Original User: dewey32167

Hello All,

I hope this will be a simple question.

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

Capture11.PNG

Capture12.PNG

DanPatterson_Retired

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