[postgis-users] Need a "polygon box" of a table instead of the bounding box that returns extent function

George Silva georger.silva at gmail.com
Mon May 3 05:30:47 PDT 2010

>From what i understood of your request, you need to collect all the polygons
and merge in a single one. Use the St_Collect function to do that.

The bounding box function will give you the extent of the whole, as you
described. This is default behavior.


On Mon, May 3, 2010 at 9:28 AM, Oscar Zamudio <cmntlk at gmail.com> wrote:

> Hi all,
> I'm using the extent function to get the geographic coverage of a table.
> That function returns a bounding box, i.e. a polygon with 4 points (XMin
> YMin ...etc). I do know that the actual coverage of teh table is not a four
> points polygon but an arbitrary polygonal shape with many vertexs. I want to
> get this shape form the same table. There is any function or operation that
> can give me that shape?
> Regards,
> Oscar
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George R. C. Silva

Desenvolvimento em GIS
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