GeoSPARQL is a standard for representation and querying of geospatial linked data for the Semantic Web from the Open Geospatial Consortium (OGC).The standard provides:
A simplified diagram of some geometry classes and properties:
GraphDB 6.5 introduces support for GeoSPARQL.
The GeoSPARQL support is implemented as a GraphDB plugin, which is currently not installed by default. To install the plugin follow these steps:
The plugin allows you to configure it through SPARQL-Update queries with embedded control predicates:
When the plugin is enabled it will index all existing GeoSPARQL data in the repository and automatically reindex any updates.
When the plugin is disabled it will not index any data or process updates. It will not handle any of the GeoSPARQL predicates either.
Usually this is a configuration option which could be used in cases where your index files
Some examples of select queries on geographic data. For demo purposes just import the following files:
and run the following queries queries on them:
For more information regarding GeoSPARQL predicates and functions please look at the current official spec : OGC 11-052r4, Version: 1.0, Approval Date: 2012-04-27, Publication Date: 2012-09-10.
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