[geos-devel] Is empty LinearRing closed?

[Martin Davis]

I'm not sure why strk is making this comment.  JTS/GEOS supports empty geometries of all types (as per the OGC SFS).  

That said, what kind of empty geometry is returned from various methods is open to interpretation, I think.  In some cases I think the best you can do is to return an empty GC.  In other cases a more precise kind of empty geometry can be returned  (and as I noted, JTS/GEOS could probably improve it's semantics in a few cases. )

Martin Davis, Senior Technical Architect
Vivid Solutions Inc.      www.vividsolutions.com
Suite #1A-2328 Government Street Victoria, B.C. V8T 5G5
Phone: (250) 385 6040 - Local 308 Fax: (250) 385 6046


> -----Original Message-----
> From: geos-devel-bounces at geos.refractions.net 
> [mailto:geos-devel-bounces at geos.refractions.net] On Behalf Of 
> Mateusz Loskot
> Sent: March 30, 2006 2:36 PM
> To: GEOS Development List
> Subject: Re: [geos-devel] Is empty LinearRing closed?
> 
> 
> strk at refractions.net wrote:
> > The only valid EMPTY geometry would be a 
> GEOMETRYCOLLECTION. All other 
> > possibilities should be avoided IMO.
> 
> Honestly, I don't like it.
> This is unclear and messed solution.
> What is the rationale to return instance of 
> GeometryCollection where empty Point is expected?
> 
> Cheers
> -- 
> Mateusz Łoskot
> http://mateusz.loskot.net 
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