SamePlaceAs.orgLinking Locations

since 2011dc: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

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?

Link Locations

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 A Domain BDomain B

“Peer-to-peer” dataset links “Star” Connections of datasets

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

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.”

SamePlaceAs GUI – Search by URI

SamePlaceAs GUI – Search by BBOX

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

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