[GIS] How to convert Shapefiles to 3D DXF

3ddxfqgis

I'm using QGIS version 1.8.0-Lisboa and I'm trying to convert a vector line file and it's not working. I right click on the layer>Save as>Autocad file>DXF. After that I try to open the output file in Microstation (Bentley Software) and the file does not open at all. Can you please help me?

EDIT:
I already succeeded in converting to DXF, now I have another problem, I need a 3D file but the one I converted is just 2D, no height info

Can you help me get 3d dxf output?

Best Answer

Load your shapefile and right click on the layer in the layers window.

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THe resulting dialog lets you select the filename, encoding and crs.

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You can then load the file in the cad program of your choice.

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You may need to zoom to extents to make the laey visible to you.

According to Bentley you should also be able to import the shp file directly.

http://www.bentley.com/en-US/Products/MicroStation/Whats-New.htm

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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.

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QGIS does not manage Z coordinates importing CSV files.

You can convert the CSV to DXF using ogr2ogr from the command-line shell. This should be already installed since QGIS uses OGR too.

You need to create a .vrt file along your CSV. This is a plain-text file that you can create with any text editor. It is really easy in your case:

<OGRVRTDataSource>
  <OGRVRTLayer name="test">
    <SrcDataSource>dave.csv</SrcDataSource>
    <GeometryType>wkbPoint</GeometryType>
    <LayerSRS>WGS84</LayerSRS>
    <GeometryField encoding="PointFromColumns" x="x" y="y", z="elev"/>
    <Field name="id" type="String"/>
    <Field name="description"/>
  </OGRVRTLayer>
</OGRVRTDataSource>

Save this file in the same directory as the CSV file. If the CSV file is called dave.csv, it is practical to name it dave.vrt. Check on the third line that the SrcDataSource is correct, that is that the filename is the same as your CSV file. The LayerSRS can probably stay like this, as DXF has no concept of spatial reference system.

When the file is ready, from the command line you would issue:

ogr2ogr dave.dxf dave.vrt

This procedure is not needed for other formats. See this question about the zfield option in ogr2ogr.

Best Answer

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