Hi,
I want to write a Jena rule which could deduce the fact that 'Sheep have found
in the field'. To do this, I have got only geometries of sheep in the form of
GPS coordinates like Point(longitude latitude) e.g. POINT(-3.783065 53.202158).
Similarly, I have got the geometries of the field in the same format. My
question is how can I match the sheep's geometries with that of field
geometries and deduce the said fact. In SPARQL, I have done the same task
through the following SPARQL Query with the help of GeoSPARQL functions and it
runs succesfully:
Query: Are sheep found in the field?
ASK WHERE {
?sheep rdf:type enviot:SheepNodeOutput ;
geosparql:hasGeometry ?sgeo.
?sgeo geosparql:asWKT ?swkt.
?feature rdf:type enviot:Field;
geosparql:hasGeometry ?fgeo.
?fgeo geosparql:asWKT ?fwkt.
FILTER(geof:sfIntersects(?swkt, ?fwkt))
}
By the way, my jsonld data borrows/uses the vocabulary from my ontology which
uses the GeoSPARQL Ontology as well.
Can someone please give their thoughts/ideas about this issue/challenge? There
is a built-in primitive in Jena i.e. equal(?x, ?y) but I don't know whether it
works for comparing geo coordinates like Point(long lat) or not.
Many thanks in advance,
Izhar
