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I have vector layer of Polylines. I want to build from them a 3D surface model, so then, I would be able to move some of the Polylines to better position them, or alternatively - create (draw) new Polylines.

The surface model here is important since the modified/new vertices should be taken from this model.

For the sake of simplicity we can assume linear interpolation.

(Working env. Qgis, The solution may involve programming - Python)

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    What kind of poly-lines do you have? Are they Iso-lines of a Digital Elevation Model? – huckfinn May 11 '18 at 17:20
  • No, they represent features on the roads. – michael May 11 '18 at 17:56

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