[postgis-users] simplify creates geom collection?

[Martin Davis]

I think you'd call this a design flaw.  It sounds like JTS has a similar 
problem.  Can you post your test cases?

Burgholzer,Robert wrote:
>
> I have experienced an instance where using simplify, depending on the 
> threshold chose, creates a geometry collection, rather than a 
> multipolygon (which was my source shape type).
>
>  
>
> I am unsure of exactly what is happening, but I know that with my 
> particular shapes, a threshold of 0.0025 (dd) caused the problem, but 
> 0.002 was OK. 
>
>  
>
> Is this a bug, a feature, or operator error?
>
>  
>
> Robert W. Burgholzer
>
> Surface Water Modeler
>
> Office of Water Supply and Planning
>
> Virginia Department of Environmental Quality
>
> rwburgholzer at deq.virginia.gov <mailto:rwburgholzer at deq.virginia.gov>
>
> 804-698-4405
>
> Open Source Modeling Tools:
>
> http://sourceforge.net/projects/npsource/
>
> Web-Based Water Supply Planning Demo:
>
> http://soulswimmer.dynalias.net/models/wsdemo/demo_hsi.php
>
>  
>
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>
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-- 
Martin Davis
Senior Technical Architect
Refractions Research, Inc.
(250) 383-3022