[postgis-users] GeomUnion() strange results

[Paul Ramsey]

Any chance you can update your GEOS to rc4 Horst? Shouldn't break 
anything, only make things better...

P

Düster Horst wrote:
> I try to create the exterior boundary of all polygons of the attached 
> postgis polygon table with:
> 
> select geomunion(wkb_geometry) from test;
> 
> As the result I don't get the expected result. Only parts of the input 
> polygons are dissolved. The culprit seems to be the polygon with gid=1. 
> This polygon is very complex with many vertex points. All geometries are 
> valid, checked by isValid(wkb_geometry). Please use the attached 
> geometry table to reproduce this behaviour.
> 
> My System:
> 
> PostgreSQL 8.1.6 on i686-pc-linux-gnu, compiled by GCC gcc (GCC) 3.4.4 
> 20050721 (Red Hat 3.4.4-2)
> POSTGIS="1.1.5" GEOS="3.0.0rc1-CAPI-1.2.0" PROJ="Rel. 4.4.8, 3 May 2004" 
> USE_STATS
> 
> 
> I would appreciate any hint.
> 
> 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:horst.duester at bd.so.ch
> http://www.agi.so.ch
> 
> 
> 
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-- 

   Paul Ramsey
   Refractions Research
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   pramsey at refractions.net
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   Cell: 250-885-0632