# Re: Ontology for points in a three-dimensional space

From: Story Henry <henry.story@bblfish.net>
Date: Tue, 9 Dec 2008 00:11:54 +0100
Cc: Semantic Web <semantic-web@w3.org>
Message-Id: <F157586A-B27D-402C-9BC3-54A6C7D18DEE@bblfish.net>
To: Toby A Inkster <tai@g5n.co.uk>
```
Hehe. Cool, but I don't know if you need to make a new class for three
dimensional points. All points are 0 dimensional, see

http://blogs.sun.com/bblfish/entry/the_10_dimensions_of_reality

On the other hand yes, I can see that if you are using euclidian
geometry you may need specific euclidian x, y, z coordinates. Those
differ from the x, y relations of geo coordinate space, which occurs
on the surface of a sphere.

Unless of course you mean the same :x and :y relations as the geo
ontology ones, and so that the z is the height of the point. I am not
sure what the importance of the reference plane is otherwise. Usually
you have a reference point the Origin of your coordinate system. You
also need a unit lenght, but I suppose we have that with meters.

Henry

On 9 Dec 2008, at 00:00, Toby A Inkster wrote:

>
> Does anyone know of such a thing? Basically I want something like:
>
> :Point a rdfs:Class ;
>   rdfs:comment "A point in three dimentions"@en .
> :x a rdfs:Property ;
>   rdfs:domain :Point ;
>   rdfs:range xsd:decimal .
> :y a rdfs:Property ;
>   rdfs:domain :Point ;
>   rdfs:range xsd:decimal .
> :z a rdfs:Property ;
>   rdfs:domain :Point ;
>   rdfs:range xsd:decimal ;
> :plane a rdfs:Property ;
>   rdfs:domain :Point ;
>   rdfs:comment "The reference plane."@en .
>
> Effectively something like <http://www.w3.org/2003/01/geo/> but
> operating on arbitrary 3D reference planes instead of just WGS84.
>
> --
> Toby A Inkster
> <mailto:mail@tobyinkster.co.uk>
> <http://tobyinkster.co.uk>
>
>
>
>
```
Received on Monday, 8 December 2008 23:12:41 UTC

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