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I have a road network in 2D/PostGIS and a DEM. I want to turn the road network into 3D by retrieving the Z-value from the DEM.

Both files are quiet large so an efficient process is needed. I'd prefer to use QGIS or any other open source tool.

3

For that, you can use

  • GRASS GIS with v.drape: Converts vector map to 3D by sampling of elevation raster map.
  • SAGA GIS with Shapes - Grid\Add Grid Values to Shapes
  • QGIS with GRASS v.drape in Sextante (QGIS 1.8) or Processing (QGIS 2.0)

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  • QGIS with SAGA GIS "Add grid to shapes" in Processing (QGIS 2.0)

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  • Python in the Python console with

    raster.dataProvider().identify()

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