[postgis-users] [?] Creating a polygon from a group of polygons

[Peter]

Well thats an easy one.

If they *exactly* join,
http://postgis.refractions.net/documentation/manual-1.4/ST_Union.html

if they are a bit squishy, then one simple way is to:
- st_buffer the multiple polygons all individually outwards by say 10km,
- st_union them into a single polygon
- st_buffer that one polygon inwards (negative) 10km

Hopefully helpful contribution from one noob to another.

P.



Max Pyziur wrote:
>
> Greetings,
>
> Could someone please recommend how to create a polygon from a set of polygons?
>
> Specifically, a group of states (say, a set of contiguous northeastern United States) and from that form the polygon containing this region
>
> Much thanks,
>
> Max Pyziur
> pyz at brama.com
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