An Approach to Publish Spatial Data on the Web: The GeoLinked Data Use Case
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  • 1. An Approach to Publish Spatial Data on the Web: The GeoLinked Data Use Case Luis M. Vilches-Blázquez, Boris Villazón-Terrazas, Alexander de León Freddy Priyatna, and Oscar Corcho Facultad de Informática, Universidad Politécnica de Madrid Campus de Montegancedo sn, 28660 Boadilla del Monte, Madrid http://www.oeg-upm.net Phone: 34.91.3366605, Fax: 34.91.3524819
  • 2. ToC • Introduction • A Process for Publishing GeoLinked Data • Identification of the data sources • Ontology modelling • Generation of the RDF data • Data publication and visualization • Conclusions and Future Work
  • 3. Introduction • Open Data Movement and Web of Data. • GeoLinkedData is an open initiative whose aim is to enrich the Web of Data with Spanish geospatial data. • It has started off by publishing diverse information sources from the National Geographic Institute of Spain (IGN).
  • 4. A Process for Publishing GeoLinked Data 1. Identification of the data sources 2. Ontology modelling 3. Generation of the RDF data 4. Data publication and visualization
  • 5. 1. Identification of the data sources IGN National Geographic Institute of Spain Oracle & MySQL All these data sources contain multilingual information in the official languages of Spain (Castilian, Galician, Catalan, and Basque).
  • 6. 2. Ontology modelling • hydrOntology is an OWL-DL ontology that follows a top-down development approach. • It attempts to cover most of the concepts of the hydrographical domain. • Harmonizing heterogeneous information sources coming from several cartographic agencies and other international resources. • Regarding methodological issues, the approach adopted is METHONTOLOGY, a widely-used ontology building methodology. • Knowledge models (feature catalogues of the IGN, the Water Framework European Directive, the Alexandria Digital Library, the UNESCO Thesaurus, Getty Thesaurus, GeoNames, FACC codes, etc.). • It has 150 classes, 34 object properties, 66 data properties and 256 axioms.
  • 7. 3. Generation of the RDF Data • R2O is an extensible, fully declarative language to describe mappings between relational database schemas and ontologies. • The ODEMapster processor generates Semantic Web instances from relational instances based on the mapping description expressed in the R2O document.
  • 8. 3. Generation of the RDF Data • Creation of the R2O Mappings
  • 9. 3. Generation of the RDF Data
  • 10. 3. Generation of the RDF Data Excerpt of the R2O document
  • 11. 4. Data publication and visualization HTML Linked Data SPARQL Including Provenance Support Pubby Pubby 0.3 Virtuoso 6.1.0
  • 12. 4. Data publication and visualization Metadata elements: - Dublin Core - voiD metadata
  • 13. http://geo.linkeddata.es/
  • 14. Provinces
  • 15. Beaches
  • 16. Conclusions and Future Work • Conclusions • An ongoing process aimed at publishing spatial data on the Web with a Spanish GeoLinked Data use case • The process followed and proposed methodological guidelines for the involved activities. • Future work • Data cleansing • Identifying and interlinking with DBpedia and Geonames • Include other domains • Improve faceted browser
  • 17. An Approach to Publish Spatial Data on the Web: The GeoLinked Data Use Case Luis M. Vilches-Blázquez, Boris Villazón-Terrazas, Alexander de León Freddy Priyatna, and Oscar Corcho Facultad de Informática, Universidad Politécnica de Madrid Campus de Montegancedo sn, 28660 Boadilla del Monte, Madrid http://www.oeg-upm.net Phone: 34.91.3366605, Fax: 34.91.3524819