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RE: Spatial datatypes and RDF/OWL

From: John Goodwin <John.Goodwin@ordnancesurvey.co.uk>
Date: Tue, 15 Apr 2008 13:47:58 +0100
Message-ID: <6A035FEF345E064E893D784097F8BC7F024A19B6@OSMAIL.ordsvy.gov.uk>
To: "Steve Harris" <swh@ecs.soton.ac.uk>
Cc: "Michael Smith" <msmith@clarkparsia.com>, <semantic-web@w3.org>

> I don't imagine that you'd want to do something like
> FILTER(withinDistance(?g1, ?g2, 3.2))
> with triples. You could write it as
> [] a :PairwiseDistance ;
>     :point ?g1 ;
>     :point ?g2 ;
>     :distance ?d ;
> FILTER(?d < 3.2)
> but it seems a bit verbose, and if you try to materialise the graph it
> will be massive.

Agreed - I had imagined that distance calculations/queries would be done
using a FILTER rather than as triples. 



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Received on Tuesday, 15 April 2008 12:48:38 UTC

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