[geos-devel] CascadedPolygonUnion XML testing

[G. Allegri]

also "another_dump2" seems to execute well with JTS. I'm using its wkt
representation as a collected multipolygon:
http://www.giovanniallegri.it/share/another_dump2_collect_wkt.txt

giovanni



2010/6/27 strk <strk at keybit.net>:
> 35 points version (2 geoms):
> http://strk.keybit.net/tmp/another_dump2.sql
>
> ... still finds non-noded intersections ...
>
> --strk;
>
> On Sun, Jun 27, 2010 at 12:18:22AM +0200, G. Allegri wrote:
>> 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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>> >> >>>
>> >> >>
>> >> >
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>> > --
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> --
>
>  ()   Free GIS & Flash consultant/developer
>  /\   http://strk.keybit.net/services.html
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