Ontop-spatial is an extension of Ontop framework with geospatial support. Ontop is a framework for ontology based data access (OBDA). It supports SPARQL over virtual RDF graphs defined through mappings to RDBMS. Check out the video below and this blog for an introduction.
Ontop-spatial extends ontop with the following geospatial capabilities:
- Geospatial virtual RDF graphs can be created on top of geospatial databases (i.e., PostgreSQL with PostGIS extension enabled).
- Geometry columns in geospatial databases can be mapped to GeoSPARQL WKT literals using R2RML or OBDA mappings
- Geospatial topology functions as defined in GeoSPARQL can be used in the filter clause of (Geo)SPARQL queries.
Ontop-spatial has been developed jointly with the FP7 EU project Optique.