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Having a points shapefile with z values, how do I keep in the geometry only the x,y values? I also want to move the z values to a newly created double field.

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Might be worth having a look here: faunalia.com/content/… – nhopton Dec 13 '12 at 19:52

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What about exporting with appended Lat/Lon (Vector -> Geometry-Tools -> Export/Append Geometry Columns), saving as new file ? If the function is implemented 3D (sorry, I've no idea if) this should give you the required result. To make shure the z is dropped, you might export the result as CSV, edit and again load as new layer.

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The function doesn't have z support. – Tudor Dec 13 '12 at 18:49
There is an thread which might be helpful: gis.stackexchange.com/questions/19163/… Especially the idea to transfer the shp into a database – Chris Pallasch Dec 13 '12 at 19:24

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