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simplification and modularization of the specification will foster the adoption of the specification to a larger community.
There is also a need to describe the capabilities of GeoSPARQL. These descriptions provide a mechanism by which a client or end user can discover information about the
SPARQL service such as supported extension functions and details about the available geospatial dataset, supported CRSs, inferences supported. There are a number of
standards that already exists to describe SPARQL endpoint such as the W3C SPARQL 1.1 Service Description, VoiD and DCAT. These standards will be adapted to
accommodate description of GeoSPARQL endpoints, by defining profiles and best practices. The next testbed should demonstrate the feasibility and robustness of the
approach by implementing the specifications.
We believe that this simplification and modularization of the specification will foster the adoption of the specification to a larger community.
10.4.4 Definition of vertical ontologies
Define vertical ontologies based on the core geospatial ontologies example EDM, Hydro, Gazetteer
10.4.5 Migration of OGC services to REST-based semantic enabled web services
Migrate all OGC services to REST-based semantic enabled web services. This implies expressing their capabilities in RDF based on existing standards DCAT, VOID, ADSM,
... and descriptions of processes in RDF parameters, constraints etc. I would start with Gazetteer, CSW, WFS and WPS.
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11 Gazetteer Linking
Gazetteer Linking is based on the premise that features in a gazetteer and other sources of information have already been matched and the match between identifiers is stored in a
concordance or is embedded in a data source. The former is known as a concordance link and the latter as an embedded link.
To take full advantage of the semantic web and ability to quickly move across links, the data sets should be encoded in an RDF. The goal of this task was to encode information
in RDF from multiple gazetteers by leveraging existing infrastructure WFS-Gs, RDBMS using semantic mapping components, demonstrate a capability to list new
information available from related resources obtaining information from sources at least two sources distant from the original source, query and select the information of interest,
and return the information in a query. This was done using open linked data standards RDF,OWL,SPARQL and the OGC GeoSPARQL query.
Going back to the Testbed-10 demo scenario, a quick look at the NGA gazetteer shows that extended information such as websites related to the city, the geography, typical
weather etc. is not readily available.
They need to Get More Stuff. The purpose of the Gazetteer Linking demonstration is to show the value of linking for obtaining additional attribute and spatial information, i.e.
information that can be used to find additional information.
11.1 Gazetteer Linking Concept
