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Unlocking Geospatial Connections: SamePlaceAs.org's Journey in Linked Data

SamePlaceAs.org, established in 2011, is at the forefront of merging geographic datasets with Linked Data through innovative approaches. The platform enables users to link locations by providing a simple atomic Linked Data service that outputs co-reference URIs, allowing spatial BBOX queries. Built on Google App Engine, it supports various formats such as CSV, JSON, and RDF. With a focus on improving dataset connections and community engagement, SamePlaceAs.org aims to refine how geospatial data interacts across the web by addressing equivalence and co-reference challenges in Linked Data.

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Unlocking Geospatial Connections: SamePlaceAs.org's Journey in Linked Data

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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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