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 <[email protected]>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 <[email protected]> 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 >> >> _______________________________________________ >> postgis-users mailing list >> [email protected] >> http://postgis.refractions.net/mailman/listinfo/postgis-users >> >> > > > -- > George R. C. Silva > > Desenvolvimento em GIS > http://blog.geoprocessamento.net > > _______________________________________________ > postgis-users mailing list > [email protected] > http://postgis.refractions.net/mailman/listinfo/postgis-users > >
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