[postgis-users] Region-style representations

[Paul Ramsey]

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P.

On Monday 22 April 2002 09:19 pm, you wrote:
> 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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