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SamePlaceAs Linking Locations since 2011

SamePlaceAs.org Linking Locations since 2011. dc:creator Todd Pehle foaf:mbox tpehle at orbistechnologies .com foaf:member Orbis Technologies dc:date December 03, 2010 dbpedia:Event SOCoP Fall Workshop geonames:locatedIn USGS, Reston, VA.

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SamePlaceAs Linking Locations since 2011

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  1. SamePlaceAs.org Linking Locations since 2011 • dc:creator Todd Pehle • foaf:mbox tpehle at orbistechnologies .com • foaf:member Orbis Technologies • dc:date December 03, 2010 • dbpedia:Event SOCoP Fall Workshop • geonames:locatedIn USGS, Reston, VA

  2. The Web of Linked Locations is Coming • The Web of Linked Data and the Geo Web are merging • Geographic datasets are being published as RDF • GeoSPARQL soon will offer a way to query geometry and spatial relationships in Linked Data • What then is a next step?

  3. Link Locations

  4. Dataset Topology in LOD Domain A Domain B Domain B LOD datasets will offer peer-to-peer relationships LOD datasets can also offer centralized star topology Centralized connections offer less data, but a wider range of dataset connections ( “routers” for LOD) A next step: centralized co-ref links; enter SamePlaceAs.org “Star” Connections of datasets “Peer-to-peer” dataset links

  5. SamePlaceAs Server • Simple atomic Linked Data service that takes a URI as input and outputs co-reference URIs for geographic features • Similar to sameAs.org but also allows spatial BBOX queries • May have more appropriate name “sameFeatureAs” • Service acts as a “graph hopper” offering alternate URIs for geo feature enabling users to “hop” from graph to graph • Cloud-based app built on Google App Engine (no triple store) • Service can return CSV, text, JSON, N3, NT, TTL formats • Supports Named Graphs for source, lineage, provenance information

  6. How to co-ref? Beware of owl:sameAs! • Issues with owl:sameAs are well documented • No uniform consensus on resolution of this issue yet; Stay tuned. • Perhaps some perspective on confusion over equivalence… Quantum Mechanics: “If you are not confused by quantum physics then you haven’t really understood it.” – Neils Bohr “I think I can safely say that no one understands quantum mechanics.” – Richard Feynman Quantum Semantics analogs: “If you are not confused by owl:sameAs then you haven’t fully understood it.” “I think I can safely say that no one understands owl:sameAs.”

  7. SamePlaceAs GUI – Search by URI

  8. SamePlaceAs GUI – Search by BBOX

  9. SamePlaceAs API URI Search: In = URI; Output all co-reference URIs BBOX Search: In = GeoRSS Box; Output all co-ref URIs in box Deref URI: In = entity or graph URI; Dereferences URI returning RDF Add: In = NT/N3/TTL/CSV; Adds entity + named graph info to KB RemoveURIs: In = URI+Graph URI; Removes URIs from graph RemoveGraph: In = GraphURI; Delete all data from graph UpdateGraph: In = GraphURI+data;Remove graph, then adds MergeSubGraphs: In = URI1,URI2; Conflates into single entity Proof: In = URI1, URI2; Derives how to URIs are connected

  10. Next Steps • Get service online • Scale Testing • Load Data • Add RDF dump • Load More Data • Add Community Curation • Build the SamePlaceAs Community • Load More Data Questions & Comments are much appreciated! tpehle @ orbistechnologies dot com

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