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Re: Spatial datatypes and RDF/OWL

From: Marco Neumann <marco.neumann@gmail.com>
Date: Mon, 14 Apr 2008 11:12:32 -0400
Message-ID: <844a8dbf0804140812qe00bd9aw2ee1f3d1f5a15e7d@mail.gmail.com>
To: semantic-web@w3.org

Hi John,

 you might want to check out our google code project geospatialweb .We
 index some spatial data types (primarily points) with R-Tree index
 structures . In the future I will add some spatial predicates, mostly
 based on Max Egenhofer's 9-Intersection Matrix spatial predicates.

 http://www.swnyc.org/index.php?title=GeoSpatialWeb

 Marco

On Mon, Apr 14, 2008 at 6:12 AM, John Goodwin
<John.Goodwin@ordnancesurvey.co.uk> wrote:
>
>
>
>
> Hi all,
>
>
>
> Working with spatial data it would be very useful if we could extend RDF/OWL
> to include spatial datatypes. The Open Geospatial Constortium (OGC) provides
> standards for spatial datatypes and these are common used in GML file
> (Geographic Markup Language  the standard for exchanging spatial data)..
>
>
>
> Could  these spatial datatypes could be used in OWL and/or RDF in the same
> way that current XML Schema datatypes are used (in fact one of the early
> version of GML was encode in RDF). It would be nice to see spatial extension
> to triples stores (in an analogous way to spatial extensions of relational
> databases) that allow SPARQL queries of the form:
>
>
>
> Select ?a ?b
>
> Where
>
> {
>
>             ?a hasGeometry ?g1 .
>
>             ?b hasGeometry ?g2 .
>
>             FILTER (touches(g1,g2))
>
> }
>
>
>
> (find all a and b where a and b have touching geometries).
>
>
>
> I'm curious to know what the issues are with this from a logical point of
> view, or is it just a non-trivial engineering problem?
>
>
>
> John .
>
>
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Received on Monday, 14 April 2008 15:13:28 UTC

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