W3C home > Mailing lists > Public > semantic-web@w3.org > April 2008

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. 

John

.


This email is only intended for the person to whom it is addressed and may contain confidential information. If you have received this email in error, please notify the sender and delete this email which must not be copied, distributed or disclosed to any other person.

Unless stated otherwise, the contents of this email are personal to the writer and do not represent the official view of Ordnance Survey. Nor can any contract be formed on Ordnance Survey's behalf via email. We reserve the right to monitor emails and attachments without prior notice.

Thank you for your cooperation.

Ordnance Survey
Romsey Road
Southampton SO16 4GU
Tel: 08456 050505
http://www.ordnancesurvey.co.uk

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

This archive was generated by hypermail 2.3.1 : Tuesday, 1 March 2016 07:42:04 UTC