On Sat, Feb 27, 2021 at 8:48 AM Jean-Marc Vanel <jeanmarc.va...@gmail.com> wrote:
> The result is now correct. The missing call is > GeoSPARQLConfig.setupMemoryIndex() > source code updated: > > https://github.com/jmvanel/semantic_forms/blob/master/scala/forms/src/main/scala/deductions/runtime/jena/GeoSPARLtest.scala#L11 > > NOTES > > - but need to re-index after RDF addition; > - setupMemoryIndex() actually registers special SPARQL predicates, > which is not apparent in method name; > - QUESTIONS: > - how expensive in terms of CPU, elapsed time and storage is > re-indexing? > you will have to test that yourself did you check out the https://github.com/galbiston/geosparql-benchmarking and https://github.com/OpenLinkSoftware/GeoSPARQLBenchmark would be nice to compare them - how to make re-index automatic? > they should be, of course it depends on your conformance requirements with OGC Geosparql as well. query rewriting requires inferencing. try the standalone implementations for your tests first, > - is GeoSPARQL indexing compatible with Lucene indexing? > no, the geospatial modul uses a different approach to indexing. The lucene index is not directly resusably in the Apache Jena geosparql module. But Andy mentioned a resurrection of our lucene spatial integration with Jena 4. we may approach this integration with a compliance register in mind in the future from a OGC GeoSPARQL 1,0 conformance level point of view. > > Jean-Marc Vanel > < > http://semantic-forms.cc:9112/display?displayuri=http://jmvanel.free.fr/jmv.rdf%23me > > > +33 > (0)6 89 16 29 52 > > > Le mer. 24 févr. 2021 à 09:17, Jean-Marc Vanel <jeanmarc.va...@gmail.com> > a > écrit : > > > The Scala code is here; > > > > > https://github.com/jmvanel/semantic_forms/blob/master/scala/forms/src/main/scala/deductions/runtime/jena/GeoSPARLtest.scala#L11 > > starting with empty TDB 1; just load 2 dbPedia cities with geo: > > coordinates, initialize with > > GeoSPARQLConfig.setupSpatialIndex(dataset) > > and query with spatial:withinBox . > > Alas, the result is empty (see bold line). > > > > Log output : > > 2021-02-24T08:04:14.609Z [run-main-6] INFO o.a.j.g.c.GeoSPARQLOperations > > - Find Mode SRS - Started > > 2021-02-24T08:04:14.633Z [run-main-6] INFO o.a.j.g.c.GeoSPARQLOperations > > - Find Mode SRS - Completed > > 2021-02-24T08:04:14.634Z [run-main-6] INFO > > o.a.j.geosparql.spatial.SpatialIndex - Building Spatial Index - Started > > 2021-02-24T08:04:14.634Z [run-main-6] INFO > > o.a.j.geosparql.spatial.SpatialIndex - Geo predicate statements found. > > févr. 24, 2021 8:04:14 AM > > org.apache.sis.referencing.factory.sql.EPSGFactory <init> > > > > *AVERTISSEMENT: La variable environnementale « SIS_DATA » n’est pas > > définie.*2021-02-24T08:04:14.973Z [run-main-6] INFO > > o.a.j.geosparql.spatial.SpatialIndex - Building Spatial Index - > Completed > > > > *?feature*[success] Total time: 5 s, completed 24 févr. 2021 à 08:04:15 > > > > If someone wants Java code to try, send me a private mail and I'll write > > it :) . > > > > Jean-Marc Vanel > > < > http://semantic-forms.cc:1952/display?displayuri=http://jmvanel.free.fr/jmv.rdf%23me > > > > +33 (0)6 89 16 29 52 > > Twitter: @jmvanel , @jmvanel_fr ; chat: irc://irc.freenode.net#eulergui > > Chroniques jardin > > < > http://semantic-forms.cc:1952/history?uri=http%3A%2F%2Fdbpedia.org%2Fresource%2FChronicle > > > > > > > -- --- Marco Neumann KONA
