Building a buffer over a terrain model
I have a polygon and a terrain model (can be either grid or TIN). I'd like to a build, say, a 1km buffer so that the 1km is measured over the surface of the terrain, i.e. not planimetric. The buffer must always be at least 1km from the polygon and prefer a measure over the flattest part of the terrain.
Anyone know a good way to do this that is robust for all the edge cases you get with real terrain?
An algorithm or solution using FOSS tools is preferred.
with Grass Gis it's posible look this link
or with pgraster