[geos-devel] How robust is GEOS?

[Martin Davis]

Thanks, Norman.  We have seen this, and it's a nice piece of work.
Unfortunately, his technique apparently doesn't work with IEEE-754
doubles.  

http://www-2.cs.cmu.edu/~quake/robust.pc.html

We're looking at similar kinds of solutions using Interval Analysis, or
possible some extended precision computation.

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 
> Norman Vine
> Sent: May 6, 2005 9:27 AM
> To: GEOS Development List
> Subject: RE: [geos-devel] How robust is GEOS?
> 
> 
> Martin Davis writes:
> 
> > This still doesn't produce the ultimate desired result of computing 
> > intersections to the full 56 bits of double precision,
> however.
> > We're working on a solution for that - will post it if and 
> when it's 
> > done.
> 
> I am sure you are familiar with this technique
> 
 http://www-2.cs.cmu.edu/~quake/robust.html

Cheers

Norman

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