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https://issues.apache.org/jira/browse/JENA-10?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13631781#comment-13631781
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Andy Seaborne commented on JENA-10:
-----------------------------------
GSoC project description:
Not all spatial queries are complicated. Many use case are covered by
provision of a single facility like get all objects within a given radius or
within a given bounding box. GeoSPARQL which is a complete approach to
geospatial query but it is complicated and driected more towards the
specialist, not the average linked data developer with SPARQL knowledge.
This project is to provide a one or two basic geospatial query functions.
Example: return places within 10 kilometers of Bristol UK (which as
latitude/longitude of 51.46,2.6).
SELECT ?placeName
{
?place spatial:query (51.46 2.6 10) .
?place rdfs:label ?placeName
}
We have a similar property function architecture in jena-text [0] so this
project is to take that concept and apply it to geospatial information.
Lucene spatial could be used for the spatial index. There is a simple
vocabulary for expressing WGS80 information [1]; there is also the point
information in WKT [2].
This project is not primarily about geospatial processing; it is concerned with
the indexing and querying simple, existing geospatial data and integration with
Fuseki.
[0] http://jena.staging.apache.org/documentation/query/text-query.html
[1] http://www.w3.org/2003/01/geo/
[2] http://en.wikipedia.org/wiki/Well-known_text
> GeoARQ: a geo location property function for ARQ
> ------------------------------------------------
>
> Key: JENA-10
> URL: https://issues.apache.org/jira/browse/JENA-10
> Project: Apache Jena
> Issue Type: New Feature
> Components: ARQ
> Reporter: Paolo Castagna
> Priority: Minor
> Labels: gsoc2013
>
> Similarly to LARQ, we can use Lucene spatial capabilities to provide a
> geo/spatial property function for ARQ.
> An initial and experimental implementation as proof of concept is available
> here: https://github.com/castagna/GeoARQ
> The initial implementation can provide:
> - ?s geoarq:nearby ( lat long ) // lat and long are in WGS 84, results are
> sorted by some "unspecified" score
> - ?s geoarq:nearby ( lat long dist ) // restrict withing dist km from
> (lat,long)
> - (?s ?d) geoarq:nearby ( lat long ) // results are sorted by distance (?d)
> which is made available to the user
> - (?s ?d) geoarq:nearby ( lat long dist )
> - ?s geoarq:within ( lat1, long1, lat2, long2 )
> GeoARQ would be better as a separate module from ARQ (same as LARQ).
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