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

[George Silva]

>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.

Att

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
http://blog.geoprocessamento.net
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