I am working on several autocad polylines (with several vertices...) that have the exact N,E coords but now I would like to add the elevation data for every polyline's vertices from a dtm.
I thought it was an easy task but I can't reach my goal so far.
I imported dxf polyline in QGIS (I tried also in GRASS).
There it seems that v.drape doesn't work.
In fact, I exported the vector as dxf (with flag -z) but I have all vertices at a same elevation (find from centroid in dtm) and the result is "flat" polylines at different elevation which is no good.
I would like to have each of the polyline's vertices with a different elevation.
Is there a way to do an easy thing like this?
I want to transform a 2d dxf in a 3d dxf by draping it on a dtm.