Open Location Data and Linked Open Data

Open Location Data and Linked Open Data Timo Westkämper Mysema OyEmail : timo.westkamper@mysema.com

semantic.hri.fi Capital region data● Faceted search interface● SPARQL form and interface● Map visualization (GoogleMaps based)

semantic.hri.fi Material● Aluesarjat data in RDF● Town part borders as KML-files● DBpedia town part descriptions

Semantic Web challenges Scaling● too generic model, difficult to index● optimization of RDF storage difficult, no standards● SPARQL is a generic interface, difficult to optimize

Linked Open Data challenges● Poor quality of data foundation, e.g. GeoNames● Heterogenic ontologies and resource identification● Crowd-sourcing material as foundation

Linking in practice● Geonames material has lots of duplicates● DBpedia has mostly description, not much semantics● Linking easiest via owl:sameAs predicate

Areastats demo Material● semantic.hri.fi material● Java service uses KML files for point-in-polygon check● http://en.wikipedia.org/wiki/Point_in_polygon

HTML5 GeoLocation APIgeo-location-javascript wrapper API for various GEO APIimplementationsif (geo_position_js.init()) { geo_position_js.getCurrentPosition( geo_success, geo_error);}function geo_success(p) { alert("Found you at latitude " + p.coords.latitude + ", longitude " + p.coords.longitude);}

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Open Location Data and Linked Open Data

by Apps4Finland on Sep 28, 2011

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Open Location Data and Linked Open Data — Presentation Transcript