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Is it possible to connect two points with fixed longitudinal slope over DEM terrain or connect points with maximum longitudinal slope? Make road line between two point, for example 7% or make it with maximum slope, for example 10%? Maybe somebody have some python code? (Qgis 2.14. essen) enter image description here

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    Have a look gis.stackexchange.com/questions/189729/… – FelixIP May 15 '16 at 20:11
  • Maybe I misunderstood, but I do not need a least cost path. – nagib May 16 '16 at 6:49
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    Yes you did. What you are talking about is a job for least cost analysis with cost being a function of slope – FelixIP May 16 '16 at 7:55
  • I want to design the road in range of longitudinal slope (grade) between 1%-10%. I dont need cheapest version. I tried with shortest path in ArcGIS, I get the shortest and cheapest results of roads, but I cannot to design road with that results, beacuse too many broken vertical alignment. Maybe You have an example? – nagib May 16 '16 at 8:58
  • or something like this; gis.stackexchange.com/questions/131702/… – nagib May 16 '16 at 15:00

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