On 12/12/2013 15:47, image wrote:
Dear all,
From my Raster DEM, i would like extract Thalweg and Drainage divide
(ridges) 's 3D vectors.
According to you, is it possible to do that with grass?
Certainly
First use the r.watershed module to create streams and basins (rasters)
from your DEM. Now do r.thin and r.to.vect on the streams raster to get
a vector layer. Finally v.drape on that vector layer using the DEM to
get a 3D vector result.
For the drainage divides, use r.to.vect on the basins raster to get an
area vector of the basins. Then you can use v.extract type=boundary to
get just the boundary lines from the basins. And then, as above, v.drape
to create the 3D vector of watershed boundaries.
In advance, Thank you.
Regards.
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Micha Silver
GIS Consulting
052-3665918
http://www.surfaces.co.il
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