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List: postgis-users
Subject: Re: [postgis-users] Can't make Polygonize work
From: Mark Cave-Ayland <mark.cave-ayland () ilande ! co ! uk>
Date: 2006-12-19 17:03:21
Message-ID: 1166547801.13799.10.camel () mca-desktop
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On Tue, 2006-12-19 at 12:13 +0000, Hugo Ferreira wrote:
> Hi,
>
> Can someone please point me what's wrong with the following:
>
> select AsSvg(((Dump(the_geom)).geom), 1, 1) as the_geom from (
> select Polygonize(the_geom) as the_geom from (
> select GeomFromText('POLYGON((0 0, 0 1, 1 1, 1 0, 0 0))') as the_geom
> union
> select GeomFromText('POLYGON((1 0, 1 1, 2 1, 2 0, 1 0))') as the_geom
> ) a
> ) b
>
> I was expecting to get only a single polygon, but instead got my original two.
>
> Thanks in advance,
>
> Hugo Ferreira
Hi Hugo,
Perhaps you are thinking of GeomUnion() instead of UNION which is an SQL
keyword that concatenates sets?
Kind regards,
Mark.
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