This sometimes does the trick for me if they actually can be unioned
ST_Union(GEOMCOLL, ST_GeomFromText('GEOMETRYCOLLECTION(EMPTY)', yoursridhere) )
(your number 2 doesn't work because that is the aggregate form, not because
ST_Union can't handle geometry collections I think)
Hope that helps,
Regina
________________________________
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Düster Horst
Sent: Wednesday, April 23, 2008 2:25 AM
To: postgis-users
Subject: [postgis-users] Geometrycollection to Multipolygon
I do have a Geometrycollection which consists of a collection of Multipolygons
and Polygons. My aim is to create one single Multipolygon from the mentioned
Geometry collection.
Until now I tried the following steps without result:
1. ST_BUFFER(GEOMCOLL,0.0) => It works but all inner rings of my input geometry
are lost.
2. ST_UNION(GEOMCOLL) => doesn't work with Geometrycollections
Does anyone has a solution to solve my problem?
Best regards
Horst
------------------------------------------------
Dr. Horst Düster
GIS-Koordinator, Stv. Amtschef
Kanton Solothurn
Bau- und Justizdepartement
Amt für Geoinformation
SO!GIS Koordination
Rötistrasse 4
CH-4501 Solothurn
Telefon ++41(0)32 627 25 32
Telefax ++41(0)32 627 22 14
mailto:[EMAIL PROTECTED]
http://www.agi.so.ch
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