Thanks for your reply. I'm not using fuseki so far, all I did was take
JenaSpatialExample1.java and modify a few things. But it definitely has
to do with the indexing mechanism: when I systematically destroy the
index folder before reloading the model(via RDFDataMgr.read(...)), the
behavior is good. I took a peek at the code under jena-spatial, as far
as I can tell there's nothing meant for removing old indexed stuff. Is
there a proper way of handling live or dynamic spatial data, apart from
reindexing every time a model update needs to be done?
Thanks,
Marc
Le 2018-01-25 à 02:31, Lorenz Buehmann a écrit :
The spatial index is based on Lucene and at least for the textindex
updates to the dataset will be reflected automatically. In your case, as
you're removing a whole named graph I don't know whether this makes a
difference, but it might be the case. It would probably be helpful for
the developers to see your Fuseki config first.
Lorenz
On 24.01.2018 18:22, Lalonde Marc wrote:
Hello all,
I'm trying to execute spatial queries with jena in the following
context: an object's position (lat/long) is updated on a regular basis
and I run a query ("SELECT ... spatial:withinCircle()...") to verify
whether the object is close to a particular point of interest. I
simulate the object's motion by increasing its long coordinate; the
associated model is removed (i.e. spatialDataset.removeNamedModel() )
and recreated with the new position; content of the Lucene indexing
folder keeps increasing. What happens is that when the object gets
within the desired radius, the query returns a result (which is good)
but I keep getting a result even though the object has (eventually)
moved beyond the point of interest + radius. Could it be because model
removal causes the spatial indexing to be out of sync? I use
"RDFDataMgr.read(m, file)" to load an updated model to the dataset.
Thanks,
Marc
--
sign _____________________
Marc Lalonde, M.Sc.A.
Conseiller senior / Senior advisor
Équipe Vision et imagerie / Vision and Imaging Team
CRIM (Centre de recherche informatique de Montréal/
Computer Research Institute of Montreal)
1-514 840-1235, ext. 6764
[email protected]
http://www.crim.ca/fr/equipes/vision-et-imagerie
