[geos-devel] CascadedPolygonUnion XML testing

[G. Allegri]

I'm getting mad. The same geometries, run in a basic test written by
me works fine: http://www.giovanniallegri.it/share/test_wkt.java
The same geometries give errors in Postgis (+GEOS?) and with TestRunner...

giovanni

2010/6/26 strk <strk at keybit.net>:
> On Sat, Jun 26, 2010 at 12:26:11AM +0200, G. Allegri wrote:
>> Before going to bed... a snapshot of the location causing the
>> exception: http://www.giovanniallegri.it/share/error_condition_snapshot.png
>
> Just in case mine is smaller, another reduction here:
> http://strk.keybit.net/tmp/another_dump1.sql
> (201 points in 3 geoms)
>
> NOTE: my version is a database dump, failure happens on st_union
> which fails with original geoms and fails with snapped overlay.
> dropping any of the 3 geoms makes the operation succeed, haven't
> checked if that's a special handling within postgis.
>
> It'd be worth filing a ticket on trac for better handling.
>
> --strk;
>
>>
>>
>>
>> 2010/6/25 G. Allegri <giohappy at gmail.com>:
>> > This is the reduced version of the test xml:
>> > http://www.giovanniallegri.it/share/TestUnionMultiPolygon_red.xml
>> >
>> > Now it contains only two geometries. It tries to node them but fails,
>> > so a second try is done with the SnapOverlay, but it fails too.
>> > I don't know the algorithm so I'm not able, yet, to say what is failing.
>> >
>> > giovanni
>> >
>> > 2010/6/25 G. Allegri <giohappy at gmail.com>:
>> >> Here is a test xml:
>> >> http://www.giovanniallegri.it/share/TestUnionMultiPolygon.xml
>> >> It's big, but I will reduce it nex time :)
>> >>
>> >> Notes:
>> >>
>> >> 1 - this multipolygon comes from an st_collect on 95 rows in a postgis
>> >> table. The test on it fails with Topology Expection found non-noded
>> >> intersection, because the MP is invalid. I've tested it on jts from
>> >> trunk.
>> >> 2 - I've run a cascadedunion.union operation on a List of the same
>> >> geometries (picked with Geotools directly from the DB). It works fine.
>> >> In this test I've used jts 1.10 shipped with Geotools. I will try it
>> >> agains the trunk version as soon as possible.
>> >>
>> >> Giovanni
>> >>
>> >> 2010/6/25 strk <strk at keybit.net>:
>> >>> On Fri, Jun 25, 2010 at 04:39:17PM +0200, strk wrote:
>> >>>> Martin, is there any support for testing CascadedUnion
>> >>>> with the XML format ? Would help comparing GEOS/JTS.
>> >>>
>> >>> I've found TestUnaryUnion.xml in JTS repository.
>> >>> I guess that's what GEOS should be using
>> >>> for testing CascadedPolygonUnion.
>> >>>
>> >>> Only need to actually port UnaryUnion ...
>> >>>
>> >>> --strk;
>> >>>
>> >>>  ()   Free GIS & Flash consultant/developer
>> >>>  /\   http://strk.keybit.net/services.html
>> >>> _______________________________________________
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>> >>> http://lists.osgeo.org/mailman/listinfo/geos-devel
>> >>>
>> >>
>> >
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> --
>
>  ()   Free GIS & Flash consultant/developer
>  /\   http://strk.keybit.net/services.html
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