=== Spatial query
JENA-10
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).
SELECT ?placeName
{
?place spatial:query (51.46 2.6 10) .
?place rdfs:label ?placeName
}
We have a similar property function architecture in jena-text [0] 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 [1]; there is also the point
information in WKT [2].
This project is not primarily about geospatial processing; it is
concerned with the indexing and querying simple, existing geospatial
data and integration with Fuseki.
[0] http://jena.staging.apache.org/documentation/query/text-query.html
[1] http://www.w3.org/2003/01/geo/
[2] http://en.wikipedia.org/wiki/Well-known_text
