[postgis-devel] Re: [geos-devel] "Hard" topology test case

[strk at refractions.net]

This testcase seems to succeed against upcomint 3.0.0
(haven't seen it visually, but result is NOT invalid)

--strk;

On Sun, Apr 02, 2006 at 08:42:06PM +0200, Laszlo Istvan wrote:
> 
> Hi, Paul,
> 
> To continue our former discussion with a wider audience: I have 
> found a small example which still causes GEOS Intersection to 
> generate invalid (self-intersecting) output from valid input.
> 
> PostgreSQL 8.0.1 on i686-pc-linux-gnu
> 
> POSTGIS="1.1.2" GEOS="3.0.0cvs-CAPI-1.1.1"
> PROJ="Rel. 4.4.9, 29 Oct 2004" USE_STATS
> 
> Both PostGIS and GEOS are the CVS version of 31 March.
> 
> I have included below the WKB of the two polygons (broken at 
> every 80th characters). They intersect along a rather narrow 
> strip.
> 
> I hope it helps in the debugging and improving the topology 
> code, and I will try to find further samples of acceptable 
> sizes.
> 
> Best regards,
> Istvan Laszlo
> 
> On Tue, 21 Mar 2006, Paul Ramsey wrote:
> 
> >By all means, open the discussion. At this point we are really trying to 
> >get as many cases as possible in our "library of really hard things".
> >P
> >
> 
> 01030000000100000008000000AC86FF1FC6F8254100000000E89D0041380EF9FE79F925416F9092
> F857A20041E6ADF7FE4BFA25417E7C8BF88FA60041A919EAFE6302264172D74AF817CD0041FB3EE8
> 4F640626410000000068DC004100000000DA0626410000000068DC004100000000DA062641000000
> 00E89D0041AC86FF1FC6F8254100000000E89D0041
> 
> 01030000000100000018000000168BC5A2D7FE25410000000068C3004100000000FCFE2541000000
> C0C8C20041000000E027FF25410000004065C20041000000A047FF2541000000A034C20041000000
> 605EFF2541000000C0EEC1004100000000BAFF2541000000A0A5C0004160E9E55DC1FF25414D5FB9
> 518CC0004198536655CAFF254170C769846DC00041000000209BFF2541000000A0A5BF0041000000
> A076FF254100000080FEBE00410000000041FF2541000000C020BE00410000004039FF2541000000
> 8000BE0041000000E020FF2541000000E089BD0041F9E006050BFF25416B82F03B28BD0041000000
> E0EAFE2541000000A098BC00419827B70BC3FE2541BA1E1398D1BB00410000004069FE2541000000
> E010BA00410000000030FE25410000006015B9004183C61E772FFE2541271E1A0513B900411F2E34
> 7D17FE25414446286AA9B80041000000400FFE25410000002085B80041000000007AFD25417AAC21
> E649BA0041000000007AFD25410000000068C30041168BC5A2D7FE25410000000068C30041
> 
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