[geos-devel] CascadedPolygonUnion XML testing

[G. Allegri]

Before going to bed... a snapshot of the location causing the
exception: http://www.giovanniallegri.it/share/error_condition_snapshot.png



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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>>
>