[postgis-devel] GEOS XMLTester throws error case

[strk at refractions.net]

On Wed, Jan 05, 2005 at 10:31:34AM -0500, Carl Anderson wrote:
> strk at refractions.net wrote:
> 
> >On Tue, Jan 04, 2005 at 04:32:43PM -0500, Carl Anderson wrote:
> > 
> >
> >>in Jump 1.1.3rc5 this case works fine
> >>
> >>using GEOS's XMLTester  i get a side location conflict exception. 
> >>(output validation is bogus so ignore that)
> >>   
> >>
> >
> >With JTS-1.4 testrunner it throws 'side location conflict' as well.
> >(which JTS version does your Jump use ?)
> >
> >--strk;
> >
> > 
> >
> JTS-1.4.0.jar
> 
> yes it does throw the error.  I misread hthe error dialog.   Jump 
> mishandles the exception and pops up a confusing dialog
> 
>           Validation Errors
>              Layer: test1
>              No Validation Errors
> 
> notice that both shapes report as valid.
> 
> 
> -------------------------------------------------------------------------
> From here,  If there is no motivation for improving  the numerical 
> robustness... (hope there is)
> 
> Then I really do want to be able to set arbitrary scales for the 
> PrecisionManager in the geometryFactory.
> difference(g1,g2,scale)
> which hopefully will  keep precision levels low enough to avoid this issue.

I'd integrate a grid application function I wrote long ago as part
of a web gis solution.
It accepts a grid origin and cell sizes in input. Coordinate values
would then be 'snapped' to the grid and collapsed points would be
removed. 

--strk;

> 
> 
> C.
> 
> -- 
> Carl Anderson
> GIS Manager Fulton County, Georgia
> carl.anderson at co.fulton.ga.us
> 404.730.8026
> 
> 
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