Semantic Evolution of Geospatial Semantic Evolution of Geospatial Web Services: Web Services: Use Cases and Experiments in the Use Cases and Experiments in the Geospatial Semantic Web Geospatial Semantic Web Joshua Lieberman, Todd Pehle, Mike Dean Traverse Technologies, Inc., Northrop Grumman Information Technology / TASC, BBN Technologies
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Semantic Evolution of Geospatial Web Services: Use Cases and
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Semantic Evolution of GeospatialSemantic Evolution of GeospatialWeb Services:Web Services:
Use Cases and Experiments in theUse Cases and Experiments in theGeospatial Semantic WebGeospatial Semantic Web
What are OGC and OWS ?What are OGC and OWS ?♣ “The Open Geospatial Consortium, Inc. (OGC) is a non-profit,
international, voluntary consensus standards organization that isleading the development of standards for geospatial and locationbased services”
♣ “Opengeospatial Web Services” (OWS) - OGC has been developingfor some time specifications for a suite of Web services (sensulato) and associated encodings to expose geospatial content andoperations from distributed content repositories to remoteclients 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
1) GSW Background1) GSW Background♣ Geospatial Semantic Web: Use of Semantic Web technologies to
discover and reason on geospatial information (UCGIS, Egenhofer,Sheth, etc.)
♣ GSW broad research activity sponsored by National GeospatialIntelligence Agency (NGA), undertaken by a number of investigators
♣ Interoperability experiment: an Open Geospatial Consortium(OGC) -sanctioned member collaboration to test or refine OWS specifications
♣ This “GSW IE”: activity proposed by NGA, NGIT/TASC, and BBN totest and refine OGC(+) specifications within a scenario for geospatialquery with formal semantics:♣ Web Feature Service (WFS) and Filter Encoding (FE)♣ Geography Markup Language (GML)♣ ISO 19115 / 19119 / 1910n / FGDC feature metadata (ISO)
♣ Other initial participants: SCO, Jaume I, Muenster, Galdos, GMU, …
♣ The Geospatial part♣ Maps and map visualization♣ Features and feature geometries♣ Geographic and other relationships
♣ The Web part♣ Distributed data - “maintain locally / access globally”♣ Shared services, loosely or tightly coupled to geodata♣ Interoperability between technologies, vendors, architectures
♣ The Semantic part♣ Interoperability between communities and domains♣ Softer software♣ Automated reasoning and inference
Role of interoperability / opening the templeRole of interoperability / opening the temple
♣ Focuses on sustained operability - today and the next day♣ Permits separation of concerns♣ Supports information portability♣ Allows component interchangeability♣ Contributes to transparency, testability, and trust♣ Layers of interoperability build on one another♣ Stable syntax promotes shared semantics / understanding♣ Standards are necessary but not sufficient for
♣ Exercise current semantic technology in a geospatial realm
♣ Demonstrate an end-to-end geospatial semantic query♣ Utilize multiple ontologies for Geointel operations♣ Develop OGC service descriptions with formal semantics
(e.g. OWL-S description for Web Feature Service)♣ Develop and test Semantic Web Services interface / role for
OGC services♣ Enhance interoperability in a distributed, heterogeneous