Open Location Data and Linked Open Data

Timo Westkämper Mysema Oy

Email : 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 API

geo-location-javascript wrapper API for various GEO API implementations

if (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);

}

Questions?