[postgis-users] Intersection doesn't work on some data

[David Mitchell]

Brilliant, installing postgis 0.8.1 and postgres 7.4 fixed the problem 
perfectly. Thanks guys

David Mitchell wrote:
> I'm running Redhat 9.0 with Postgres 7.4 and Postgis 0.8.0 (ok, so not 
> latest version).
> 
> I'll try on latest versions and see how I fare,
> 
> Thanks
> 
> David
> 
> Paul Ramsey wrote:
> 
>> And what platform are you running on?
>>
>> strk wrote:
>>
>>> This is what I get with postgis-CVS:
>>>
>>> SRID=-1;MULTILINESTRING((-121.33193 41.18388,-121.34693 41.18388),
>>> (-121.34693 41.18388,-121.36293 41.18388),(-121.36293 41.18388,
>>> -121.36545 41.18388),(-121.36545 41.18388,-121.37179 41.18388),
>>> (-121.37179 41.18388,-121.37608 41.18402),(-121.37608
>>> 41.18402,-121.44594 41.18385))
>>>
>>> This is what you reported as the correct answer:
>>>
>>> MULTILINESTRING ((-121.331929 41.18388, -121.34693 41.18388),
>>> (-121.34693 41.18388, -121.36293 41.18388), (-121.36293 41.18388,
>>> -121.36544 41.18388), (-121.36544 41.18388, -121.37179 41.18388),
>>> (-121.37179 41.18388, -121.37608 41.18401), (-121.37608
>>> 41.184019, -121.44593 41.18384))
>>>
>>> There is a 0.00001 displacement, but I think the bug you reported has 
>>> already been fixed. What version of postgis are you running ?
>>>
>>> --strk;
>>>
>>> On Wed, Mar 24, 2004 at 07:02:20PM +0100, strk wrote:
>>>
>>>> On Wed, Mar 24, 2004 at 09:40:28AM -0800, David Blasby wrote:
>>>>
>>>>> David,
>>>>>
>>>>> Thanks for your excellent bug report - it should be "easy" to track 
>>>>> down whats causing this problem given all your information.
>>>>>
>>>>> Its almost certainly involving the conversion between postgis and 
>>>>> GEOS - this usually occurs if there's a missed byte somewhere.
>>>>>
>>>>> Unfortunately, I dont have time to look at this until the beginning 
>>>>> of April - perhaps strk could?
>>>>>
>>>>> dave
>>>>
>>>>
>>>>
>>>> Yes. I'll take this.
>>>>
>>>> --strk;
>>>> _______________________________________________
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>>>> postgis-users at postgis.refractions.net
>>>> http://postgis.refractions.net/mailman/listinfo/postgis-users
>>>
>>>
>>>
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>>
>>
>>
>>
> 
> 


-- 
David Mitchell
Software Engineer
Telogis

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