I've organized a session with Dave Kolas at MIT/ W3C [1] earlier this year and Parliament looks indeed great, it already uses PostGIS for the spatial queries. I am not sure how Parliament relates to the Jena API though.
[1] http://www.vimeo.com/23850413 On Tue, Sep 13, 2011 at 11:28 AM, Rob Battle <[email protected]> wrote: > Hi, > > As Dave mentioned, Parliament [1] supports geospatial and temporal indexing. > We index data using the geo-owl ontologies [2] for geospatial data and OWL > time [3] for temporal data (although only ProperIntervals and > DateTimeIntervals are supported, not DateTimeInstants). The spatial index > supports predicates corresponding to RCC-8 and OGC simple features as > property functions and can use PostGIS or a memory-mapped r-tree as an index. > > If you are interested, Parliament also has preliminary support for the > proposed OGC GeoSPARQL [4] standard for geospatial queries over RDF (note > that this is different from http://www.geosparql.org). > We also have an unpublished article [5] which describes GeoSPARQL, evaluates > some existing research/implementations in the geospatial semantic web, and > describes the GeoSPARQL implementation in Parliament. > > The Parliament geosparql branch is located at [6] > > -rob > > [1] http://parliament.semwebcentral.org > [2] http://www.w3.org/2005/Incubator/geo/XGR-geo/#owl > [3] http://www.w3.org/TR/owl-time/ > [4] http://portal.opengeospatial.org/files/?artifact_id=44722 > [5] > http://semwebcentral.org/scm/viewvc.php/*checkout*/branches/geosparql/paper/swjarticle.pdf?root=parliament > [6] https://projects.semwebcentral.org/svn/parliament/branches/geosparql > (username/password anonsvn) > > On Sep 13, 2011, at 8:17 AM, Dave Reynolds wrote: > >> There is also Parliament [1] which offers both geospatial and temporal >> indexing graphs. >> >> Dave >> >> [1] http://parliament.semwebcentral.org/ >> >> >> On Tue, 2011-09-13 at 13:08 +0100, Paolo Castagna wrote: >>> Hi Alex, >>> great to hear that, you are welcome. >>> >>> Something similar using Lucene Spatial capabilities instead of >>> a proper GIS is here (it's just a less than two days hack): >>> https://github.com/castagna/GeoARQ >>> >>> I was planning to post something along the lines of "making >>> easier to plug LARQ or similar into ARQ", but unfortunately I do >>> not a good idea (yet). >>> >>> It would be good to enable third parties to add their own property >>> functions (that's possible) which use custom indexes and need to >>> update those indexes as triples/quads are added/removed to the >>> underlying RDF store. >>> >>> More on this later, in the meantime: welcome. >>> >>> Paolo >>> >>> Alexander Dutton wrote: >>>> -----BEGIN PGP SIGNED MESSAGE----- >>>> Hash: SHA1 >>>> >>>> Hi all, >>>> >>>> We've currently got a lot of (simple) geospatial data in >>>> <http://data.clarosnet.org/> (served behind the scenes by Fuseki). >>>> >>>> We'd like to do some geospatial indexing magic, and were wondering >>>> about writing something a bit like LARQ that will pull out things like >>>> geo:Points and WKT literals, place them in a PostGIS-flavoured DB, and >>>> then implements something like GeoSPARQL (<http://geosparql.org/>). >>>> >>>> Has anyone started doing this or something similar? I'm happy to give >>>> it a go and I'm sure my employer would be happy to contribute it back >>>> to Jena and the ASF. My plan was to go through the LARQ codebase to >>>> work out how it hooks itself in, and use that as a model. >>>> >>>> Yours, >>>> >>>> Alex >>>> >>>> - -- >>>> Alexander Dutton >>>> Metamorphoses Project Developer, Claros >>>> Oxford University Computing Services, ℡ 01865 (6)13483 >>>> -----BEGIN PGP SIGNATURE----- >>>> Version: GnuPG v1.4.11 (GNU/Linux) >>>> Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org/ >>>> >>>> iEYEARECAAYFAk5vQbgACgkQS0pRIabRbjC9QACfTZtTcFIhDXjWPR+MpEWunKkt >>>> 38oAnR5n+oi1nuTZAfRdOrF2mcOac2Ck >>>> =r1dj >>>> -----END PGP SIGNATURE----- >>>> >>> >> >> >> > > -- Marco Neumann KONA --- Join us at the Semantic Web Media Summit in New York City for an exciting event on 14 September 2011 http://www.lotico.com/evt/swmsNYC2011/
