- From: Wolfgang Orthuber <orthuber@kfo-zmk.uni-kiel.de>
- Date: Mon, 22 Jun 2009 14:52:54 +0100
- To: "Toby A Inkster" <tai@g5n.co.uk>
- Cc: "Linked Data community" <public-lod@w3.org>
Thanks for this implementation! If we implement such distance calculation in a search engine, and sort the result according to distance, this would be local search (search within a special region). In this case the search vector has two dimensions (GPS coordinates). This is a special case of general similarity search http://www.orthuber.com/wpa.htm In general similarity search the search result is ordered according to a distance functions which can be defined by all http URI owners (using the convention shown in Figure 2 of http://www.orthuber.com/wp1.pdf ). It would be possible to search generally for objects which have similar quantitative (numeric) description. So the general application would be very attractive. Wolfgang ----- Original Message ----- From: "Toby A Inkster" <tai@g5n.co.uk> To: "Linked Data community" <public-lod@w3.org> Sent: Sunday, June 21, 2009 10:45 AM Subject: URIs for great circle arcs > Great circle arcs are the shortest surface paths between two points on a spherical body. I've minted some > URIs (and am serving up RDF/ XML) for great circle arcs on the surface of the Earth. Amongst other things, > the RDF/XML returned will tell you the distance between the points, the compass bearing and the midpoint. > > For example, the arc between London and Tokyo is represented as: > > <http://ontologi.es/place/arc/51.507778;-0.128056/35.683333;139.766667> > > which is a geo:SpatialThing. There is also: > > <http://ontologi.es/place/arc/ 51.507778;-0.128056/35.683333;139.766667#points> > > which is an rdfs:Container representing the (infinite) set of all points between the two endpoints of the > line. > > An additional feature is the ability to link to URIs representing the endpoints. e.g.: > > <http://ontologi.es/place/arc/ 51.507778;-0.128056/35.683333;139.766667?uri1=http://dbpedia.org/ > resource/London&uri2=http://dbpedia.org/resource/Tokyo> > > The document you get returned still has a primaryTopic of > > <http://ontologi.es/place/arc/51.507778;-0.128056/35.683333;139.766667> > > (i.e. it doesn't alter the linked data URI) but now contains explicit dbpedia references for the end > points. Those URIs don't have to be from dbpedia - they could be anything - they're not used in > calculations of distances, etc - just included in the output. > > Possible uses: flight and travel linked data. > > Any ideas for improvements? > > -- > Toby A Inkster > <mailto:mail@tobyinkster.co.uk> > <http://tobyinkster.co.uk> > > > > >
Received on Monday, 22 June 2009 12:48:38 UTC