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

[Oscar Zamudio]

I need to clarify: my table is a table of streets. So ... I don't know how
to proceed.


On Mon, May 3, 2010 at 9:30 AM, George Silva <georger.silva at gmail.com>wrote:

> 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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