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I was wondering if there was any way to create main axis (axis of symmetry) lines for polygons. I have polygons that represents buildings. I will want to find main axes (axis of symmetry) for those buildings and axis direction respect to a cardinal point. Best regards Stefano

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Are all building polygons guaranteed to be rectangles? If so, are you assured that they are represented by exactly four vertices (and not more, as shown at gis.stackexchange.com/q/22739)? –  whuber Apr 23 '12 at 16:07
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building polygons are often represented by more than 4 vertices (eg worship places) –  Stefano Apr 24 '12 at 5:17
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