[postgis-users] Region-style representations

[Tyler Mitchell]

Right on Paul, that works like a charm!  Any other neat new stuff you guys 
are picking at way at in CVS?

On Monday 22 April 2002 01:35 pm, you wrote:
> In the CVS version, you already can:
>
> select collect(the_geom) from geotable group by someattr;
>
> returns aggregate features (geometrycollection) grouped by an attribute.
>
> P.
>
> On Monday 22 April 2002 03:09 pm, you wrote:
> > Your definition sounds good enough to me.
> > The reason this came up is that I'm discussing using postgis with some
> > other applications which traditionally have created regions in arcinfo
> > for their analysis.  Is it possible (or going to be possible) to create
> > multipolygons from polygons within postgis, via some dissolving on an
> > attribute(s) function?
> >
> > Tyler
> >
> >
> >
> >                       Frank Warmerdam
> >                       <warmerdam at pobox.com>                   To:
> > postgis-users at postgis.refractions.net Sent by:
> >   cc:
> >                       postgis-users-admin at postgis.refr        Fax to:
> >                       actions.net                             Subject: 
> > Re: [postgis-users] Region-style representations
> >
> >                       04/22/2002 11:21 AM
> >                       Please respond to postgis-users
> >
> > Tyler Mitchell wrote:
> > > Hi guys,
> > > Are there plans/possibilities of representing polygons a la ArcInfo
> > > region-style?  Is this covered off in another OGC spec?
> >
> > Tyler,
> >
> > My understanding is that regions in arc/info are a way of making a
> > feature (with attributes) that consists of one or more simple polygons
> > that may have
> > wholes.  That is region is potentially a set of disconnected areas.  In
> > OGC Simple Features this would be a MultiPolygon geometry and should be
> > supported directly by PostGIS.
> >
> > I am not absolutely certain if my OGR region handling actually treats
> > regions properly as MultiPolygons or not, but if so I would imagine they
> > could be loaded into PostGIS with ogr2ogr.
> >
> > Best regards,
>
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