I am using Apache Jena Fuseki Server for Storing Geo Coordinates of location. How to find out that if two polygons or two rectangles intersect each other inside Fuseki.
I have stored geocoordinates in WKT serialization format. When I execute below query *PREFIX xsd: <http://www.w3.org/2001/XMLSchema# <http://www.w3.org/2001/XMLSchema#>> PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns# <http://www.w3.org/1999/02/22-rdf-syntax-ns#>> PREFIX geo: <http://www.opengis.net/ont/geosparql# <http://www.opengis.net/ont/geosparql#>> PREFIX xsd: <http://www.w3.org/2001/XMLSchema# <http://www.w3.org/2001/XMLSchema#>> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema# <http://www.w3.org/2000/01/rdf-schema#>> PREFIX : <http://example.org/# <http://example.org/#>> PREFIX geo: <http://www.opengis.net/ont/geosparql# <http://www.opengis.net/ont/geosparql#>> PREFIX spatial: <http://jena.apache.org/spatial# <http://jena.apache.org/spatial#>> SELECT ?object WHERE { GRAPH <http://project/base/default <http://project/base/default>> { ?subject geo:asWKT ?object . } }* I get these below results. object 1 "POLYGON((8.463699817657472 48.99872928913063,8.463887572288515 48.998644821906865,8.46399486064911 48.998764483764916,8.46425771713257 48.99865538031766,8.464375734329225 48.998746886450874,8.463919758796694 48.99893693711346,8.463699817657472 48.99872928913063))" 2 "POLYGON((8.463560342788698 48.99847940651206,8.463560342788698 48.99864834137738,8.46377491950989 48.99864834137738,8.46377491950989 48.99847940651206,8.463560342788698 48.99847940651206))" 3 "POLYGON((8.463447690010073 48.99835974396915,8.463447690010073 48.99849348443939,8.463646173477175 48.99849348443939,8.463646173477175 48.99835974396915,8.463447690010073 48.99835974396915))" 4 "POLYGON((8.463254570961 48.99821544463795,8.463254570961 48.99838438039854,8.463635444641115 48.99838438039854,8.463635444641115 48.99821544463795,8.463254570961 48.99821544463795))" 5 "POLYGON((8.463689088821413 48.99826823712468,8.463689088821413 48.99845477012966,8.46402168273926 48.99845477012966,8.46402168273926 48.99826823712468,8.463689088821413 48.99826823712468))" 6 "POLYGON((8.463892936706545 48.99843013373508,8.463892936706545 48.998588510344774,8.464316725730898 48.998588510344774,8.464316725730898 48.99843013373508,8.463892936706545 48.99843013373508))" 7 "POLYGON((8.463093638420107 48.99805354732974,8.463093638420107 48.998243600637835,8.463737368583681 48.998243600637835,8.463737368583681 48.99805354732974,8.463093638420107 48.99805354732974))" 8 "POLYGON((8.463619351387026 48.99797963751407,8.463619351387026 48.998180249615714,8.464118242263796 48.998180249615714,8.464118242263796 48.99797963751407,8.463619351387026 48.99797963751407))" 9 "POLYGON((8.464407920837404 48.998303432084754,8.464407920837404 48.99857443244431,8.46477270126343 48.99857443244431,8.46477270126343 48.998303432084754,8.464407920837404 48.998303432084754))" 10 "POLYGON((8.464225530624391 48.99806762537742,8.464225530624391 48.99839141937611,8.464820981025698 48.99839141937611,8.464820981025698 48.99806762537742,8.464225530624391 48.99806762537742))" Then later I want to filter out these geo:WKT objects based on geo:intersection (Intersection or equals or contains methods). And I updated my query as below. *PREFIX xsd: <http://www.w3.org/2001/XMLSchema# <http://www.w3.org/2001/XMLSchema#>> PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns# <http://www.w3.org/1999/02/22-rdf-syntax-ns#>> PREFIX geo: <http://www.opengis.net/ont/geosparql# <http://www.opengis.net/ont/geosparql#>> PREFIX xsd: <http://www.w3.org/2001/XMLSchema# <http://www.w3.org/2001/XMLSchema#>> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema# <http://www.w3.org/2000/01/rdf-schema#>> PREFIX : <http://example.org/# <http://example.org/#>> PREFIX geo: <http://www.opengis.net/ont/geosparql# <http://www.opengis.net/ont/geosparql#>> PREFIX spatial: <http://jena.apache.org/spatial# <http://jena.apache.org/spatial#>> SELECT ?object WHERE { GRAPH <http://project/base/default <http://project/base/default>> { ?subject geo:asWKT ?object . ?object geo:equals "POLYGON((8.463699817657472 48.99872928913063,8.463887572288515 48.998644821906865,8.46399486064911 48.998764483764916,8.46425771713257 48.99865538031766,8.464375734329225 48.998746886450874,8.463919758796694 48.99893693711346,8.463699817657472 48.99872928913063))" } } * Which should result me atleast the coordinates of first geo object which really equals the POLYGON coordinates but I get empty results as shown in below image. Please suggest me where I am getting it wrong. But I get no results as attached in snapshot. Please help me regarding this.
