[gdal-dev] The 2.5D geometry proposal

[Oyvind Idland]

Hi Ralf,

full 3D/volumetric objects was not what I was refering to. I mean
"2.5D", simple features
with Z (and M) ordinates.

If I understand correct, this is what Adam is refering to in his proposal.

SQL/MM do specify Z and M geometries (plus circular geometries).


Oyvind



On Thu, Sep 16, 2010 at 2:23 PM, Ralf Suhr <Ralf.Suhr at itc-halle.de> wrote:
> Hi Oyvind,
>
> there no 3D in ISO SQL/MM part 3. If you want real 3D, you have to define
> volumetric objekts. PostGIS support SQL/MM part 3.
>
> Gr
> Ralf
>
> Am Donnerstag 16 September 2010 14:03:09 schrieb Oyvind Idland:
>> Hello,
>>
>> been taking a look at "Adam's 2.5D simple features proposal" at the OGR
>>  website.
>>
>> Question: Why not adopt the existing ISO SQL/MM part 3 standard ?
>>
>> The SQL/MM standard is an extension to the existing WKB/WKT by OGC.
>>
>> The extensions includes Z and M geometries, and even arcs
>> (CircularString/CompoundCurve etc).
>>
>>
>> regards,
>>
>>
>> Oyvind Idland
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