[GRASS-user] Calculate the steepness

[Hamish]

Jonathan Piraux wrote:
> I would like to calculate the number of streets segments
> having a steepness above 5%.
> 
> Therefore I slpit my street vectors lines into segments of
> 100m and I created a a slope raster via a DEM (via
> r.slope.aspect).
> 
> Then, I was planing to use v.rast.stat but it only work
> with polygon.
> 
> I tried to convert my vectorial lines in polygons but it
> doesn't work.
> 
> Do have someone a sugestion?

after splitting into 100m segments, v.drape DEM + 'v.to.db option=slope' ?



Hamish