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Questions tagged [geosparql]

For question related to GeoSPARQL, a standard for representation and querying of geospatial linked data for the Semantic Web from the Open Geospatial Consortium (OGC). Please do not use for triplestore-specific geospatial SPARQL extensions.

GeoSPARQL is a standard for representation and querying of geospatial linked data for the from the Open Geospatial Consortium (OGC).

The definition of a small ontology based on well-understood OGC standards is intended to provide a standardized exchange basis for geospatial data which can support both qualitative and quantitative spatial reasoning and querying with the database query language.

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GraphDB geof:distance between two points returns empty fields - geosparql

I am using GraphDB and want to calculate the geof:distance between two points by using geosparql. The ?point and ?point2 are geometries and are structured like this "POINT(-77.050125 38.892086)"^^ .…
GGEv
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SPARQL DBPedia query for seating capacity, optimize and remove duplicates

I want to get all objects with seating capacity information on DBPedia. Optionally, I want to get their label, address, lat and lon information. My issue is that I get a lot of duplicates even after filtering by language. How can I get distinct…
Mike
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How to find subjects which are bound to a certain location (sparql)

Currently, I am trying to find subjects in which case the geo:asWKT is the same for all these subjects in the Dutch sparql endpoint. Initially I derived the geo:asWKT from a building and subsequently I tried to have corresponding subjects to this…
Joy
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GeoSPARQL functions and spatial reference systems (SRS)

I am trying to represent in an ontology a few geometric objects (polygon, lines, points, etc.) and calculate their spatial/topological relations, through the adoption of GeoSPARQL relevant functions (sfTouches, sfEquals, sfContains, etc.). I am…
mriga
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Configure/Enable GeoSPARQL plugin through RDF4J API

I am trying to automate the creation of GraphDB repos which must also have the GeoSPARQL plugin enabled. To this end, I am sending 2 INSERT statements, the first for configuring the index and accuracy and the second statement for enabling the…
Theofilos Ioannidis
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area not calculated in graphdb

I need to calculate Area but there is an error Query evaluation error: Unknown function 'http://www.opengis.net/def/function/geosparql/area' (HTTP status 500) By following query in the image But it works in stardog, see image please Thanks for your…
user1772602
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Is it possible to infer new knowledge about an ontology only from a query in SPARQL?

Is it possible to infer new knowledge about an ontology only from a query in SPARQL? I have a question about the use of the SPARQL language about ontologies. So far I have thought that SPARQL is the equivalent to the SQL language in the relational…
Manuel
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Building a Spatial Index

I want to build spatial index on my Jena Fuseki server. I try to follow the doc here : https://jena.apache.org/documentation/query/spatial-query.html But when I restart my server I have this : [2018-05-24 17:05:03] Server INFO Apache Jena…
Tanguy PERRETTE
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GraphDB & GeoSPARQL

I run this query : PREFIX geo: PREFIX geof: select * where { ?x ?fGeom . ?fGeom geo:asWKT ?fWKT . …
Laurent Pierre
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GeoSPARQL within query

I'm struggling with the GeoSPARQL functions. I have two points defined in my ontology. Using this query I get them in my results: PREFIX geo: PREFIX geof:…
Johan Kumps
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Topology query in geosparql

I have inspired this articles and created an ontology with using geosparql ontology. Two classes named Area and Park were created as subclasses of the Feature class of geosparql. 3 Area instances and 1 Park instance were added to the ontology. Then,…
asdxx
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Finding Date Range from String Values in SPARQL

I have triples that organized like following. "201701" "201703" "201705" "201706" "201606" Here object part of the…
Beautiful Mind
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SPARQL get dbpedia ressources by category

I'm a beginner in SPARQL. And I'm having problems to get the latitude and longitude of all university by city on DBpedia. I tried multiple things without success. This page shows the universities of Paris on the dbo:campus property, so I like to…
fingerprints
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How can I load Geospatial RDF in Virtuoso?

Sorry for noobish question. I want to know what kind of format (syntax) a geospatial RDF should have so I can load it into Virtuoso (Open Source) and do a GeoSPARQL query over it. I found a very small and simple geospatial RDF and wanted to load it…
Fariba Gharib
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What WKT type does Parliament Want?

I'm getting the following error message from Parliament 2.7.9 which did not occur for the same data under Parliament 2.7.4: 2016-10-06 14:39:53,362 [qtp766572210-18] WARN [com.bbn.parliament.jena.graph.index.spatial.geosparql.datatypes.WKTLiteral]…
Greg Cox
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