1. SamePlaceAs.org Linking Locations since 2011 dc:creatorTodd Pehle foaf:mboxtpehle at orbistechnologies.com foaf:memberOrbis Technologies dc:dateDecember 03, 2010 dbpedia:EventSOCoP Fall Workshop geonames:locatedInUSGS, 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  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 Domain ADomain B “Peer-to-peer” dataset links “Star” Connections of datasets

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 1. URI Search: In = URI; Output all co-reference URIs 2. BBOX Search: In = GeoRSS Box; Output all co-ref URIs in box 3. Deref URI: In = entity or graph URI; Dereferences URI returning RDF 4. Add: In = NT/N3/TTL/CSV; Adds entity + named graph info to KB 5. RemoveURIs: In = URI+Graph URI; Removes URIs from graph 6. RemoveGraph: In = GraphURI; Delete all data from graph 7. UpdateGraph: In = GraphURI+data;Remove graph, then adds 8. MergeSubGraphs: In = URI1,URI2; Conflates into single entity 9. 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