[geos-devel] CascadedPolygonUnion XML testing

[strk]

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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  ()   Free GIS & Flash consultant/developer
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