[Qgis-user] Road / path slope

[Nicolas Cadieux]

Hi, 
Profile tool would help, I don't know qprof. You could always try a classic cost path raster analysis using the grass or saga module available in processing. That would give you the easiest route between 2 points. 
For something like what you have on the link, I have not seen this on Qgis.  The easiest way would be to draw the lines, densify the geometry, extract the nodes into points, then use the point sampling tool to get some values. 
If you want to extract slope, you would need to make a slope analysis on the raster and extract those value with the point sampling tool.  You could then show these points along the line using the values with a color scale. If you extract the road names at the same time as the point slope values, then you could make a xtab and get to stats (mim,max,avg) for each roads.  (The point sampling tool can extract values from vectors or raster layers.) 
Cheers. 
Nicolas 
On Apr 5, 2016 2:31 AM, "trenti76 [via OSGeo.org]" <ml-node+s1560n5259647h18 at n6.nabble.com> wrote: 

	




Hi. 

I want to create a road/path slope map. 

I have the road on .shp file polylines and elevations from .DEM. I want to know
the slope of every section (between two nodes). Really I want know the best
route (minimum slope) between two points or draw the road and view the slope of
each section. 

I try with profile tool and qprof tool, but I'm thinking about any like that: https://www.arcgis.com/home/item.html?id=a4bda006f2f64b03b8803443d4970ae3 

Any way easy to do that? Any tool? I search for info and read any post, but
anyone do a easy way. 

Thanks 

 		 	   		  
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