I wish to project (continue/extend/whatever) a polyline upslope following a specified gradient along a DEM surface. Is there any way of doing this?

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    What kind of solution are you looking for? An algorithm? A procedure using your favorite GIS software (which software)? What format should the output have? Also, what do you mean by a "specified gradient"? After all, the DEM already stipulates where the surface is (in 3D) and it therefore determines the gradient lying over any given polyline: there is nothing left to "specify." – whuber Jul 31 '13 at 15:31
  • Thanks for your response - I should have been more specific. I am using Arc 10.1 and I am basically looking for a procedure or set of procedures that would allow me to to perform this sort of operation in arc (files.carlsonsw.com/mirror/manuals/Carlson_2013/source/…) – Craig Aug 1 '13 at 9:51

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