[postgis-devel] Oracle SDO_GEOMETRY vs PostGIS WKT

Jorge Arévalo jorge.arevalo at deimos-space.com
Wed Aug 25 04:05:12 PDT 2010


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 <jorge.arevalo at deimos-space.com>:
> Hi,
>
> On Wed, Aug 25, 2010 at 12:43 PM, Nicklas Avén
> <nicklas.aven at jordogskog.no> 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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>>
>>
>



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Jorge Arévalo
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