[GRASS-user] slope along defined section (e.g. road, stream,)

[Frank Broniewski]

On Wednesday 06 February 2008 18:22:12 Tim Michelsen wrote:
> 3) add the slope to the attribute table of the stream/road vector

I see the biggest problem in this part of your idea, since a spacially 
extended feature (road or river in your case) simply cannot have one slope 
value for its complete spatial course. More like the slope will change for 
each cell of your slope raster map. So given your road is a vector you could 
only apply one value for each section from node to node of your vector. Which 
value should be taken or is a average value enough?

Why don't you just calculate a slope map for your required region and use 
d.profile to see your slope values as a profile. Or you could use v.report to 
see whats under your stream or road.
 Just a few thoughts

Greetings Frank