We propose an OBDA approach for accessing geospatial data stored in relational databases, using the OGC standard GeoSPARQL and R2RML or OBDA mappings. We introduce extensions to an existing SPARQL-to-SQL translation method to support GeoSPARQL features. We describe the implementation of our approach in the system ontopspatial, an extension of the OBDA system Ontop for creating virtual geospatia...

We present Strabon, a new RDF store that supports the state of the art semantic geospatial query languages stSPARQL and GeoSPARQL. To illustrate the expressive power offered by these query languages and their implementation in Strabon, we concentrate on the new version of the data model stRDF and the query language stSPARQL that we have developed ourselves. Like GeoSPARQL, these new versions us...

We present Strabon, a new RDF store that supports the state of the art semantic geospatial query languages stSPARQL and GeoSPARQL. To illustrate the expressive power offered by these query languages and their implementation in Strabon, we concentrate on the new version of the data model stRDF and the query language stSPARQL that we have developed ourselves. Like GeoSPARQL, these new versions us...

In this paper we present the tool GeoTriples that allows the transformation of Earth Observation data and geospatial data into RDF graphs, by using and extending the R2RML mapping language to be able to deal with the specificities of geospatial data. GeoTriples is a semiautomated tool that transforms geospatial information into RDF following the state of the art vocabularies like GeoSPARQL and ...

Mobile devices are ubiquitous and, due to their increasing number of sensors and their powerful features, enable users to consume and produce huge amounts of highly-dynamic data (such as location data, other devices in range, and another local context information recollected by sensors). Semantic techniques can be applied to offer smart data to their users and remote client requests. In this pa...

We propose that participatory GIS (PGIS) activities including participatory urban planning can be made more efficient and effective if spatial reasoning rules are integrated with PGIS tools to simplify engagement for public contributors. Spatial reasoning is used to describe relationships between spatial entities. These relationships can be evaluated quantitatively or qualitatively using geomet...

This paper presents the design of a GeoSPARQL query processing solution for scientific raster array data, called GeoLD. The enables implementation SPARQL endpoints on top OGC standard Web Coverage Processing Services (WCPS). Thus, semantic querying data is supported without need specific functions in language. To achieve this, first to RDF mapping solutions were defined, based well-known W3C ma...

Work Package WP 2, Semantics‐Based Geospatial Information Management Task T 2.2 Type Prototype Approval Status Final Version 1.0 Number of Pages 46 Filename D2.2.1_Integration_of_external_geospatial_databases.pdf Abstract: This document presents two tools, Sparqlify and TripleGeo, for transforming geospatial data from several conventional formats, into RDF triples, compliant with several standa...