[postgis-devel] Oracle SDO_GEOMETRY vs PostGIS WKT

[Nicklas Avén]

Yes, that was a great link.

Paul, do you have any thoughts to share about PostGIS and topology:
http://opengeo.org/products/coredevelopment/postgis/topology/

Olivier is also thinking about topological aspects of 3D as discussed some week ago. 

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.

/Nicklas



2010-08-25 Jorge Arévalo  wrote:

Reply to myself: good link to read http://bgis.sanbi.org/gis-primer/page_22.htm
>
>Useful to avoid mixing concepts or missunderstandings.
>
>2010/8/25 Jorge Arévalo:
>> Hi,
>>
>> On Wed, Aug 25, 2010 at 12:43 PM, Nicklas Avén
>> wrote:
>>> Hallo
>>>
>>>>
>>>>Yep, like other companies developing propietary software. The point is
>>>>I don't understand why using a mix of numbers and arrays whose
>>>>elements index tables to simply represent a polygon. Saving storage
>>>>space? I don't know. The PostGIS way, closer to OGC standard, is much
>>>>easier, IMHO.
>>>>
>>>
>>> I don't know what this Oracle representation looks like but from above it
>>> sounds like it might be about some topological model.
>>> In PostGIS representation I guess it is difficult to describe two neighbor
>>> polygons without repeating the shared vertexes for both polygons?
>>>
>>> /Nicklas
>>>
>>
>> Yes, Oracle Spatial's data model seems to be a topological model [1].
>> Thanks for pointing me to that fact. As I said, I find it some
>> tangled, and I'm looking for the reason. Or am I talking non-sense?
>>
>> Best regards,
>> Jorge
>>
>>>
>>>
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>>
>
>
>
>-- 
>Jorge Arévalo
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