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<body>Yes, that was a great link.<br />
<br />
Paul, do you have any thoughts to share about PostGIS and topology:<br />
http://opengeo.org/products/coredevelopment/postgis/topology/<br />
<br />
Olivier is also thinking about topological aspects of 3D as discussed some week ago. <br />
<br />
Jorge, do you have a link to that Oracle documentation? I think this an interesting topic too, but I know far to little about it.<br />
<br />
/Nicklas<br />
<br />
<br />
<br />
2010-08-25 Jorge Arévalo wrote:<br />
<br />
Reply to myself: good link to read http://bgis.sanbi.org/gis-primer/page_22.htm<br />
><br />
>Useful to avoid mixing concepts or missunderstandings.<br />
><br />
>2010/8/25 Jorge Arévalo
<jorge.arevalo@deimos-space.com>:<br />
>> Hi,<br />
>><br />
>> On Wed, Aug 25, 2010 at 12:43 PM, Nicklas Avén<br />
>>
<nicklas.aven@jordogskog.no> wrote:<br />
>>> Hallo<br />
>>><br />
>>>><br />
>>>>Yep, like other companies developing propietary software. The point is<br />
>>>>I don't understand why using a mix of numbers and arrays whose<br />
>>>>elements index tables to simply represent a polygon. Saving storage<br />
>>>>space? I don't know. The PostGIS way, closer to OGC standard, is much<br />
>>>>easier, IMHO.<br />
>>>><br />
>>><br />
>>> I don't know what this Oracle representation looks like but from above it<br />
>>> sounds like it might be about some topological model.<br />
>>> In PostGIS representation I guess it is difficult to describe two neighbor<br />
>>> polygons without repeating the shared vertexes for both polygons?<br />
>>><br />
>>> /Nicklas<br />
>>><br />
>><br />
>> Yes, Oracle Spatial's data model seems to be a topological model [1].<br />
>> Thanks for pointing me to that fact. As I said, I find it some<br />
>> tangled, and I'm looking for the reason. Or am I talking non-sense?<br />
>><br />
>> Best regards,<br />
>> Jorge<br />
>><br />
>>><br />
>>><br />
>>> _______________________________________________<br />
>>> postgis-devel mailing list<br />
>>> postgis-devel@postgis.refractions.net<br />
>>> http://postgis.refractions.net/mailman/listinfo/postgis-devel<br />
>>><br />
>>><br />
>><br />
><br />
><br />
><br />
>-- <br />
>Jorge Arévalo<br />
>DEIMOS Space<br />
>Internet & Mobilty Division<br />
>Ronda de Poniente 19. Edificio Fiteni VI, portal 2, 2º<br />
>28760 Tres Cantos (Madrid)<br />
>Tel: +34 91 806 34 50 - ext: 155<br />
>jorge.arevalo@deimos-space.com<br />
>http://gis4free.wordpress.com<br />
>_______________________________________________<br />
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><br />
>
</nicklas.aven@jordogskog.no></jorge.arevalo@deimos-space.com>
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