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I wanted to know whether it is possible to change the coordinates of a Polygon by typing them in.

I don't want to have to manually drag them into the right position.

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Do you mean that you want to shift the whole polygon by some dx and dy values? If so, there's the Spatialite function SHiftCoords(). It takes the existing geometry, an X-shift and a Y-shift, and returns a new geometry translated by that shift. –  Micha Sep 25 '12 at 10:41
    
Not sure what you mean by "tipping them in" –  Rayner Sep 25 '12 at 10:42
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Just install the Numerical Vertex Edit plug-in for QGIS. It installs a new button in the shape menu bar and allows you to numerically edit the vertex of a polygon typing the coordinates. ciao

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