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We have been given a DXF that contains a Elevation attribute but we would like to generate a 3D DXF. I know I can generate a 3D dxf from a shapefile using:

ogr2ogr -f "DXF" out.dxf in.shp -zfield Elev

But the ogr driver doesn't seem to pick up the attributes as fields in the dxf.

Does anyone know if this is possible.

I would like a free solution if possible. We do have FME but I'm looking around for other options.

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  • not sure what you mean by elev attribute. is it a block definition with attributes?
    – Brad Nesom
    Aug 2, 2011 at 5:07
  • This doesn't seem to work for polygons as it creates hatches which don't have elevatuion. Adding parameter -nlt MULTILINESTRING to ogr2ogr fixed this for me.
    – Toivo Säwén
    Apr 26, 2017 at 12:34

2 Answers 2

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I have been trying to find a way of doing this for months. In the end, the only method I could find was to load the DXF into gvSIG and export it as a shapefile. Doing this adds the linestring z-value to the shapefile's DBF as an attribute.

In my case, the DXFs were OS OpenData containing contours, along with other data that I did not require, so I extracted just the contours to a new DXF before loading the file into gvSIG:

ogr2ogr -f DXF contours.dxf -where "LAYER='G8040201'" original.dxf
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In FME you would want the 3DForcer transformer.

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  • This is the route I would do - though the question sways for a cheaper (i.e. free) solution.
    – Mapperz ♦
    Aug 3, 2011 at 2:21

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