an approach to publish spatial data on the web: the geolinked data use case
TRANSCRIPT
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An Approach to Publish Spatial Data on the Web:
The GeoLinked Data Use Case
Luis M. Vilches-Blázquez, Boris Villazón-Terrazas, Alexander de LeónFreddy Priyatna, and Oscar Corcho
Facultad de Informática, Universidad Politécnica de MadridCampus de Montegancedo sn, 28660 Boadilla del Monte, Madrid
http://www.oeg-upm.netPhone: 34.91.3366605, Fax: 34.91.3524819
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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
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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).
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A Process for Publishing GeoLinked Data
1. Identificationof the data sources
2. Ontologymodelling
3. Generationof the RDF data
4. Data publication and visualization
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1. Identification of the data sources
IGNNational Geographic Institute of Spain
Oracle & MySQL
All these data sources contain multilingual information in the official languages of Spain (Castilian, Galician, Catalan, and Basque).
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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 fromseveral cartographic agencies and other international resources.
• Regarding methodological issues, the approach adopted isMETHONTOLOGY, a widely-used ontology building methodology.
• Knowledge models (feature catalogues of the IGN, the WaterFramework European Directive, the Alexandria Digital Library, theUNESCO Thesaurus, Getty Thesaurus, GeoNames, FACC codes,etc.).
• It has 150 classes, 34 object properties, 66 data properties and 256axioms.
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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.
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3. Generation of the RDF Data
• Creation of the R2O Mappings
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3. Generation of the RDF Data
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3. Generation of the RDF Data
Excerpt of the R2O document
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4. Data publication and visualization
SPARQL
Pubby
Linked DataHTML
Virtuoso 6.1.0
Pubby 0.3
Including ProvenanceSupport
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4. Data publication and visualization
Metadata elements:- Dublin Core- voiD metadata
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http://geo.linkeddata.es/
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Provinces
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Beaches
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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
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An Approach to Publish Spatial Data on the Web:
The GeoLinked Data Use Case
Luis M. Vilches-Blázquez, Boris Villazón-Terrazas, Alexander de LeónFreddy Priyatna, and Oscar Corcho
Facultad de Informática, Universidad Politécnica de MadridCampus de Montegancedo sn, 28660 Boadilla del Monte, Madrid
http://www.oeg-upm.netPhone: 34.91.3366605, Fax: 34.91.3524819