Note:The following post requires gdal 1.8
A lot of times we need to send/use 3D dxf files, we used to use FME however FME is not free or cheap. So I went looking for a free solution.
If you have gdal 1.8 it’s just one simple command line run using, what is becoming my favorite GIS tool, ogr2ogr.
All you have to do is run:
ogr2ogr -f "DXF" {outFile} {inFile} -zfield {ColumnWithZValue}
So in my case I ran:
ogr2ogr -f "DXF" C:\Temp\contourswarwick.dxf C:\Temp\Contours.TAB -zfield Height
I haven’t fully tested it but {outfile} can be any file ogr supports.
and the output:
In the words of, the not so great, Charlie Sheen. WINNING!
Happy mapping :D
Nathan Woodrow 