the PREFIX should be spatial: <http://jena.apache.org/spatial#>
And yes with regards to the conversion but only if you want to make use of geosparql functions It is part of the preparation for the session to collect input before the event and address questions like yours. On Mon, Oct 26, 2020 at 2:17 PM Jean-Marc Vanel <jeanmarc.va...@gmail.com> wrote: > I missed ApacheCon, and I need some concrete hints sooner than next year. > > Currently my database gives an empty answer to : > PREFIX spatial: <http://geovocab.org/spatial#> > # ?feature spatial:withinBox(?latMin ?lonMin ?latMax ?lonMax [ ?limit]) > SELECT * WHERE { > ?feature spatial:withinBox( 43.0 0.0 46.0 10.0 100 ) > } LIMIT 100 > > Should I apply once for all GeoSPARQLOperations.convert() ? > static Dataset > < > https://jena.apache.org/documentation/javadoc/arq/org/apache/jena/query/Dataset.html?is-external=true > > > convert > < > https://jena.apache.org/documentation/javadoc/geosparql/org/apache/jena/geosparql/configuration/GeoSPARQLOperations.html#convert-org.apache.jena.query.Dataset- > > > (Dataset > < > https://jena.apache.org/documentation/javadoc/arq/org/apache/jena/query/Dataset.html?is-external=true > > > dataset) > Convert the input dataset to the most frequent coordinate reference system > and default datatype. > > 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 lun. 26 oct. 2020 à 11:02, Marco Neumann <marco.neum...@gmail.com> a > écrit : > > > good questions Jean-Marc, I will organize a session early in the new year > > to address some of them. In your case geo:lat and geo:long are not part > of > > OGC GeoSPARQL but require a transformation. We have a tool in place for > > that in Jena. And yes displaying large datasets need dedicated strategies > > for efficient processing. The points raised by you would make a good > > problem statement for our session next year. Not sure if you have > attended > > the ApachCon 2020 GeoSPARQL session last month but it's where I > > mentioned further collaboration with third party tool developers as a > > possibility. stay tuned. > > > > Marco > > > > > > On Mon, Oct 26, 2020 at 9:14 AM Jean-Marc Vanel < > jeanmarc.va...@gmail.com> > > wrote: > > > > > After reading the official > > > https://jena.apache.org/documentation/geosparql/ > > > I'm puzzled as to concrete how to . > > > > > > My simple export use case > > > > > > - I have a TDB 1 database with geo:lat and long properties; the Jena > > > geosparql dependency is added to my application > > > - I have a LeafLet viewer able to display any RDF document with > > geo:lat > > > and long properties ; example map > > > < > > > > > > https://semantic-forms.cc:1953/assets/geo-map/geo-map.html?link-prefix=http://semantic-forms.cc:1953/display?displayuri=&lang=fr&url=https://semantic-forms.cc:1953/sparql?query=%0APREFIX+form%3A+%3Chttp%3A%2F%2Fraw.githubusercontent.com%2Fjmvanel%2Fsemantic_forms%2Fmaster%2Fvocabulary%2Fforms.owl.ttl%23%3E+%0APREFIX+rdfs%3A+%3Chttp%3A%2F%2Fwww.w3.org%2F2000%2F01%2Frdf-schema%23%3E+%0APREFIX+geo%3A+%3Chttp%3A%2F%2Fwww.w3.org%2F2003%2F01%2Fgeo%2Fwgs84_pos%23%3E+%0APREFIX+foaf%3A+%3Chttp%3A%2F%2Fxmlns.com%2Ffoaf%2F0.1%2F%3E+%0A%0ACONSTRUCT+%7B%0A++%3Fthing+geo%3Along+%3FLONG+.%0A++%3Fthing+geo%3Alat+%3FLAT+.%0A++%3Fthing+rdfs%3Alabel+%3FLAB+.%0A++%3Fthing+foaf%3Adepiction+%3FIMG+.%0A%7D+WHERE+%7B%0A++graph+%3Fg+%7B%0A++++%3Fthing+%3Chttp%3A%2F%2Fpurl.org%2FNET%2Fc4dm%2Fevent.owl%23produced_in%3E+%3Chttp%3A%2F%2Fsemantic-forms.cc%3A1952%2Fldp%2FCormoz%3E+.%0A++%7D%0A++graph+%3Fgcoord+%7B%0A++++%3Fthing+geo%3Along+%3FLONG+.%0A++++%3Fthing+geo%3Alat+%3FLAT+.%0A++%7D%0A++OPTIONAL+%7B%0A+++graph+%3Fg1+%7B%0A++++%3Fthing+rdfs%3Alabel+%3FLAB+%7D+%7D%0A++OPTIONAL+%7B%0A+++graph+%3Fg2+%7B%0A++++%3Fthing+%3Curn%3AdisplayLabel%3E+%3FLAB+%7D+%7D%0A%0A++OPTIONAL+%7B%0A+++graph+%3Fg3+%7B%0A++++%3Fthing+foaf%3Adepiction+%3FIMG+%7D+%7D%0A++OPTIONAL+%7B%0A+++graph+%3Fg4+%7B%0A++++%3Fthing+foaf%3Aimg+%3FIMG+%7D+%7D%0A%0A++++OPTIONAL+%7B%0A+++graph+%3FgrCount+%7B%0A++++%3Fthing+form%3AlinksCount+%3FCOUNT.%0A++%7D+%7D%0A%7D%0AORDER+BY+DESC%28%3FCOUNT%29%0A > > > > > > > ; but I found that JavaScript based displayers are falling on their > > > knees > > > (becoming very slow) for thousands of points > > > - so I plan to use QGIS, so I need an export from RDF to one of the > > > formats QGIS supports: GML, GeoJSON , etc > > > > > > How can I do that ? > > > Do I have to use one of the convert* methods in > > > > > > > > > https://jena.apache.org/documentation/javadoc/geosparql/index.html?org/apache/jena/geosparql/configuration/GeoSPARQLOperations.html > > > ? > > > > > > 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 > > > -- --- Marco Neumann KONA
