I'm exporting data in state plane coordinate system to
ogr2ogr -f 'DXF' outfile.dxf infile.shp
The units of the projection are feet, but the DXF exporter sets the
$INSUNITS to inches (1). I can manually set the units by editing the file with a text editor, but is there a way to do it automatically with ogr2ogr? I see mention of using a custom header, but I don't know the the format or syntax I'd use to do that.