[geos-devel] Union problem

[Martin Chapman]

Martin,

Here you go.  It occurs when you union the US and Mexico. Thanks for your
help!

Best regards,
Martin


-----Original Message-----
From: geos-devel-bounces at lists.osgeo.org
[mailto:geos-devel-bounces at lists.osgeo.org] On Behalf Of Martin Davis
Sent: Thursday, April 03, 2008 12:32 PM
To: GEOS Development List
Subject: Re: [geos-devel] Union problem

Send me the shapefile and I'll try it out in JTS.

M

Martin Chapman wrote:
> Unfortunately, I do not have JTS but I will try to step through the code
and
> see if I can learn more about the problem.  Perhaps a careful inspection
of
> the input and output point sets will yield some clues because the problem
is
> predictable.
>
> Best regards,
> Martin
>
> -----Original Message-----
> From: geos-devel-bounces at lists.osgeo.org
> [mailto:geos-devel-bounces at lists.osgeo.org] On Behalf Of Paul Ramsey
> Sent: Thursday, April 03, 2008 11:50 AM
> To: GEOS Development List
> Subject: Re: [geos-devel] Union problem
>
> Most probably a bug... any chance you could run this same test case
> under JTS so we can confirm if it's a problem at the algorithm level
> or the port level?
>
> Thanks,
>
> P
>
> On Thu, Apr 3, 2008 at 10:47 AM, Martin Chapman <mchapman at texelinc.com>
> wrote:
>
>   
>> All,
>>
>> When I union the two features USA and Mexico I end up with a geometry
that
>> has one point where the y or lat value for one point is zero.  See the
>> attachment for what I mean.  Does anyone think this is a bug in GEOS or
am
>>     
> I
>   
>> not doing something correctly?  Most other geometric unions create good
>> geometries.  If you want I can send the original shape file.
>>
>>
>>
>> Thanks for any help.
>>
>>
>>
>> Best regards,
>>
>> Martin
>>
>>
>> _______________________________________________
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>>  geos-devel at lists.osgeo.org
>>  http://lists.osgeo.org/mailman/listinfo/geos-devel
>>
>>     
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>   

-- 
Martin Davis
Senior Technical Architect
Refractions Research, Inc.
(250) 383-3022

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