>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
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