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How do you calculate all the least cost pathways that exists for a region? I would like the output map to display all routes (and was wondering whether this can be done in one set of operations). I want to determine this by taking into account two things: slope and valley floors.
I have been informed that I need a DEM raster, and distance rasters to valley floors and rivers. I have a river system shapefile (once is in a polygon and the other is in a line format) but I don't know exactly how to create these rasters. As it stands, this is what the DEM raster and the riverways shapefile look like:
I have followed the tutorials in ArcGIS help 10.1 but I just don't seem to be going anywhere. I am able to create least cost pathways between two points based solely on slope, and I have tried reclassifying via building models but have been unsuccessful in creating images that display meaningful results - I think the biggest issue is inputting or creating distance rasters to valley floors/rivers and combining that with the slope raster.
Can anyone explain in layman's terms how I could create distance rasters to valley floors/rivers from a polygon or line shapefile and how this can be combined with a slope raster to create an output map displaying all existing least cost pathways for a selected study area?
Please, any help, advice, suggestions or comments would be immensely appreciated!