[GRASS-user] gradient (slope) of a road

[Francisco Calzada]

Dear list,
I'm new to this list and I wonder if you could help me.
I need to calculate the gradient (slope) of a road. I have a fine DEM to do
it. The problem is when I run r.slope.aspect the resulting slope map have
extremelly and odd high values. I don't know why. Do you? Anyway, could you
tell me how do you calculate the slope of a road?
Thank you in advance.
Paco
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