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For the sake of completeness. I believe this should be a comment on Regan response. But since I don't have enough reputation I'll leave it as a response. The DXF writer supports 2.5D layers, and given a line input, should output a 3D linestring on dxf. In the case of input POLYGONS you have to be more careful, since the driver defaults to generate a dxf ...


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This is still documented as a Software Limit at ArcGIS 10.2.2 for Desktop: Tools that aggregate and combine feature geometries, like Dissolve, may also flatten vertical line segments. There is an existing ArcGIS Idea to have Support for absolutely vertical lines or line segments in Dissolve Tool added: Lines with vertical segments (vertices have ...


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You can run GRASS GIS in a complete batch mode which includes the temporary creation of the workspace (just need to know the EPSG code of the actual projection or simply use the metadata provided by your SHAPE file, i.e. the .prj file). See for examples: http://grasswiki.osgeo.org/wiki/Working_with_GRASS_without_starting_it_explicitly See therein "Python: ...



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