I'm trying to export a DXF file from QGIS 1.8.0 Lisboa and can not have a 3D file in AutoCAD or Microstation. It results always in 2D file.
How can I export height data from a shapefile in QGIS?
[GIS] Export 3D data DXF file
3ddatadxfexportqgis
Related Solutions
There is now native export into DXF in newer versions of QGIS which allows to export map layers including the labels:
More about the functionality can be found here: https://www.qgis.ch/en/projects/dxf-export
The DXF export functionality was developed by Jürgen Fischer (Norbit) and Marco Hugentobler (Sourcepole AG). The project was co-financed by SIGE (utility provider in Vevey) and the municipalities of Vevey, Morges and Uster.
Use the Interpolation plugin. It is not turned on by default so click Plugins -> Manage Plugins and check the Interpolation Plugin box. Once activated access the plugin by clicking Raster -> Interpolation -> Interpolation.
From the plugin's menu there is a checkbox that will allow you to use the Z value of your layer as the elevation source rather than a value from the attribute table.
Best Answer
If you want to get a 3D DXF from a SHP (SHPfile generated from DTM with Qgis-Processing-Tools-GDAL/OGR Extraction-Contour), you must:
1) have column with Z values into Table attributes of SHP. 2) open "OSGeo4W Shell Commands" if you have Windows OS. 3) write into shell for example:
ogr2ogr -f "dxf" d:\Temp\3Doutput.dxf d:\Temp\contour.shp -zfield ELEV
the syntax is as follows: ogr2ogr -f "DXF" {outFile} {inFile} -zfield {ColumnWithZValue}
If an error appear, ignore it, go to the folder that contain the output file and if you find a file named "3Doutput" without extension (in this example), rename it as "3Doutput.dxf", then you will can open it with AutoCAD or other software.