[postgis-users] return boundary

[Obe, Regina]

How about ST_Boundary?
http://postgis.refractions.net/documentation/manual-svn/ST_Boundary.html

-----Original Message-----
From: postgis-users-bounces at postgis.refractions.net
[mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of
Travis Kirstine
Sent: Friday, November 21, 2008 10:18 AM
To: PostGIS Users Discussion
Subject: [postgis-users] return boundary

I have a multipolygon that has consists mainland and island polygons.
I need to generate a single polygon / line that represent the boundary
of the multipolygon as a whole, something like a convex hull but
keeping the detail of the outer rings and joining the islands to the
mainland.  I have been try different combos of convex hull, buffer and
difference but can't get what I'm looking for.

Any thoughts would be greatly appreciated

Regards

-- 
Travis K.

Toronto, Canada
------------------------------------------------------------
"She knows there's no success like failure
And that failure's no success at all."
-Bob Dylan-
------------------------------------------------------------
_______________________________________________
postgis-users mailing list
postgis-users at postgis.refractions.net
http://postgis.refractions.net/mailman/listinfo/postgis-users
-----------------------------------------
The substance of this message, including any attachments, may be
confidential, legally privileged and/or exempt from disclosure
pursuant to Massachusetts law. It is intended
solely for the addressee. If you received this in error, please
contact the sender and delete the material from any computer.