Geospatial Semantic Web: Geospatial Semantic Web: Is there life after Is there life after geo:lat and geo:long ? geo:lat and geo:long ? Joshua Lieberman Traverse Technologies & Open Geospatial Consortium European Geoinformatics Workshop, March 2007 [email protected]
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Geospatial Semantic Web: Is there life after geo:lat and geo:long ? Joshua Lieberman Traverse Technologies & Open Geospatial Consortium European Geoinformatics.
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Geospatial Semantic Web:Geospatial Semantic Web:Is there life after Is there life after
geo:lat and geo:long ?geo:lat and geo:long ?Joshua Lieberman
Traverse Technologies & Open Geospatial Consortium
What’s the (Geo) Problem?What’s the (Geo) Problem?
• Special spatial• What is geospatial interoperability?• semantic Web - microformat tagging and (multiple) identity• Semantic Web - (actionable) relationships and triple identity• geosemantic - geotagging position• Geosemantic - spatial(-temporal) theories, relationships,
mediations, transformations• Feature (type) and Geometry (representation)• Model dependencies
– Community of discourse– Scale– Reference frame / coordinate system– Perspective
Geospatial Semantic Web Challenge: Geospatial Semantic Web Challenge: Interoperability Interoperability
• The Geospatial part– Maps and map visualization– Features and feature geometries– Geographic and other relationships– Coordinate and other reference systems
• The Web part– Distributed data - “own and maintain locally / find and access globally”– Shared services, loosely or tightly coupled to geodata– Interoperability between technologies, vendors, architectures
• The Semantic part– Accessibility of “secret” knowledge– Interoperability between communities and domains– Softer software– Automated (machine to machine) reasoning and inference
• The Geosemantic part– Feature discernment– Spatial reasoning– Representational dissonance
• No particular part– Cognitive dissonance– Context and viewpoint
• “The Open Geospatial Consortium, Inc. (OGC) is a non-profit, international, voluntary consensus standards organization that is leading the development of standards for geospatial and location based services”
• “Opengeospatial Web Services” (OWS) - OGC has been developing for some time specifications for a suite of Web services (sensu latu) and associated encodings to expose geospatial content and operations from distributed content repositories to remote clients across diverse platforms:
– GML - geographic markup language (an information model and XML schema) for encoding features (geometric representations of geography).
– Web Feature Service - service providing access to collections of features– Web Map Service - service providing access to map layers (cartographically rendered
features and images)– Catalog Service / Web - service supporting (spatial) discovery of geospatial datasets and
services– Several other associated specifications, e.g. coordinate reference system encoding– Many corresponding or related ISO standards, especially 191nn (TC211)
• The OGC geospatial semantic web interoperability experiment tested initial architectures and technologies for cross-domain, distributed geospatial knowledge query, leading to multiple follow-on activities.
Aero Data (DAFIF) WFS
Aero Data (AIXM) WFS
Geonames Data Gazetteer
Service
DAFIF Ontology
AIXMOntology
GazetteerOntology
Query Domain Ontology
OWL-SDescription
OWL-SDescription
OWL-SDescription
Geospatial Intelligence Query:“Which airfields within 500 miles of
• Possible solution: intersect theories -> lighthouse and vertical obstruction are both “elevations”, but little may be agreed on the role or behavior of that shared reality. Semantic technology provides few tools to distinguish the “theories” of the subclasses.
SOCoP: SOCoP: Spatial Ontology Community of PracticeSpatial Ontology Community of Practice
• SOCoP is chartered as a Community of Practice under the Best Practices Committee of the Federal CIO Council.
• Charter: The strict purpose and focus of the Spatial Ontology Community of Practice (SOCoP) is to foster collaboration among researchers, technologists & users of spatial knowledge representations and reasoning towards the development of a set of core, common spatial ontologies for use by all in the Semantic Web. As a Community of Practice SOCoP using open collaboration and open standards, SOCoP developed ontologies will offer increased interoperability of spatial data across government (via synchronization with Geospatial Profile of FEA & GeoLOB) as well as across the entire spectrum of the World Wide Web (via W3C, ISO, OGC, etc.). SOCoP represents a strategic investment for ontology development, building on core ontological competencies, documenting best practices, and creating opportunities to partner with other cross domain and ontology COP groups. Among other things SOCoP can help inventory geospatial ontologies, develop an approach to institutionalizing and streamline the effort to support the development and management of ontologies across the GeoLOB.
• When geography-on-demand joins knowledge-with-location, the result will be a richer and more capable Web of physical resources, a Geospatial Semantic Web or Local Web having identity, connection,