Hello Paul, Paul Houle schrieb: > Jürgen Jakobitsch wrote: >> predication : in a couple of years, everything will be rdf - but >> vocabularies will only be understood >> in limited geographical areas - gone be the vision of global >> communication. >> >> http://dbpedia.org/page/New_York_City -> dbpprop:latd (xsd:integer) >> http://dbpedia.org/page/Paris -> dbpprop:latLong -> >> dbpedia:Paris/latLong/coord -> dbpprop:coordProperty (some xsd:integer - not >> interpretable) >> http://dbpedia.org/page/Berlin -> dbpprop:latD -> (xsd:double) >> http://dbpedia.org/page/Oslo -> dbpprop:latDeg -> (xsd:integer) >> http://dbpedia.org/page/Babylon -> geo:lat -> (xsd:float) >> >> > This is just the beginning of problems that you face if you try to > do serious geospatial reasoning with dbpedia data (or even try to draw > maps.)
We will try to improve this situation in the future (i.e. the live version of DBpedia). geo:lat and geo:long coordinates should be preferred. The "dbpprop" properties are extracted from Wikipedia infoboxes, which are not mapped to the DBpedia ontology. We will allow adding such mappings (hopefully) soon. > Imagine the meaning of a point coordinate for new york city, as > compared to a point coordinate for the statue of liberty. The statue of > liberty fills a footprint on the ground which is about 10 m in radius. > It's reasonable to pretend that it's a point if you're drawing a map of > NYC. NYC represents a ground footprint that is more like 10 km in > radius. At best, you can represent it with a centroid or a point > that's particularly significant (Google maps, for instance, locates > New York City at the 42nd and 7th intersection by the Port Authority Bus > Terminal;) the point for NYC is pretty much meaningless if you're > drawing a map of the city, but it would be useful if you were drawing a > map of the Northeastern US. The OpenStreetMap project [1] faces the same problems and solves them using "ways" for large objects and "nodes" for small objects. You might also be interested in our new LinkedGeoData effort [2]. Kind regards, Jens [1] http://www.openstreetmap.org [2] http://linkedgeodata.org -- Dipl. Inf. Jens Lehmann Department of Computer Science, University of Leipzig Homepage: http://www.jens-lehmann.org GPG Key: http://jens-lehmann.org/jens_lehmann.asc ------------------------------------------------------------------------------ Enter the BlackBerry Developer Challenge This is your chance to win up to $100,000 in prizes! For a limited time, vendors submitting new applications to BlackBerry App World(TM) will have the opportunity to enter the BlackBerry Developer Challenge. See full prize details at: http://p.sf.net/sfu/Challenge _______________________________________________ Dbpedia-discussion mailing list Dbpedia-discussion@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dbpedia-discussion
