GSoC project description:
Not all spatial queries are complicated. Many use case are covered by provision of a single facility like get all objects within a given radius or within a given bounding box. GeoSPARQL which is a complete approach to geospatial query but it is complicated and driected more towards the specialist, not the average linked data developer with SPARQL knowledge.
This project is to provide a one or two basic geospatial query functions.
Example: return places within 10 kilometers of Bristol UK (which as latitude/longitude of 51.46,2.6).
?place spatial:query (51.46 2.6 10) .
?place rdfs:label ?placeName
We have a similar property function architecture in jena-text  so this project is to take that concept and apply it to geospatial information.
Lucene spatial could be used for the spatial index. There is a simple vocabulary for expressing WGS80 information ; there is also the point information in WKT .
This project is not primarily about geospatial processing; it is concerned with the indexing and querying simple, existing geospatial data and integration with Fuseki.