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

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

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).

A Process for Publishing GeoLinked Data

1. Identificationof the data sources

2. Ontologymodelling

3. Generationof the RDF data

4. Data publication and visualization

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).

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.

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.

3. Generation of the RDF Data

• Creation of the R2O Mappings

3. Generation of the RDF Data

3. Generation of the RDF Data

Excerpt of the R2O document

4. Data publication and visualization

SPARQL

Pubby

Linked DataHTML

Virtuoso 6.1.0

Pubby 0.3

Including ProvenanceSupport

4. Data publication and visualization

Metadata elements:- Dublin Core- voiD metadata

http://geo.linkeddata.es/

Provinces

Beaches

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

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