1

I have a points layer with a Z (elevation) field and a terrain model (points layer or polygons layer -triangles- or eventually raster). I'm looking for a way to select the entities of my points layer that are at least 10m under the terrain model. Any way to do this in QGIS 1.8 ?

2

If your terrain model is a raster or polygon there is a very straightforward solution. Get the Point Sampling Tool Plugin and use this to get the DTM height from the ratser and add it as a new attribute to your points data. Then use a selection query to select the points where your original point height field is more than 10m less than the new raster height attribute.

If your DTM is in a point format you will have problems without converting to something else (a raster may be preferable) because you know nothing about the space in between

  • Thanks for this quick answer, it seems like it's the exact function I was looking for ! – Legzav Oct 3 '13 at 8:26

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.