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I have a table containing 3D geometry in a PostGIS 2.0 database (the geometry is of type LINESTRING Z).

I need to get the geometry out and into a DXF, DGN or 3D Shapefile. What is the easiest way to do this?

(I was sure I had achieved this via QGIS before, but it seems to remove the Z value and produce only a 2D file when attempting a 'Save As ...' from a PostGIS layer).

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Note: this is an old answer, tests with current versions might reveal different results

GDAL is able to do this. The following command creates a 3D Shapefile:

ogr2ogr -f "ESRI Shapefile" "~/myshape" PG:"user={user} password={pass} dbname={dbname} host={host}" {table}

QGIS is not able to handle 3D geometries. I would be very surprised, if it would be able to transform 3D information from one format to another.

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