1.
GeoLinkedData<br />Asunción Gómez-Pérez, Alexander de Leon, Victor Saquicela, Luis M. Vilches, <br />Oscar Corcho, and Boris Villazón-Terrazas<br />Facultad de Informática, Universidad Politécnica de Madrid<br />Campus de Montegancedo sn, 28660 Boadilla del Monte, Madrid<br />http://www.oeg-upm.net<br />Phone: 34.91.3366605, Fax: 34.91.3524819<br />

2.
ToC<br />Motivation<br />Related Work<br />GeoLinkedData<br />Identification of the data sources<br />Vocabulary Development<br />Generation of the RDF data<br />Publication of the RDF data<br />Data cleansing<br />Linking the RDF data<br />Enable effective discovery<br />Future Work<br />

3.
Motivation<br /> 99.171 % English<br /> 0.019 % Spanish<br />Source:Billion Triples dataset at http://km.aifb.kit.edu/projects/btc-2010/<br />Thanks to Aidan and Richard<br />

4.
Related Work<br />

5.
GeoLinkedData<br />It is an open initiative whose aim is to enrich the Web of Data with Spanish geospatial data.<br />It has started off by publishing diverse information sources, such as National Geographic Institute of Spain (IGN).<br />http://geo.linkeddata.es<br />Recently, National Statistics Institute (INE)<br />

6.
Process for Publishing Linked Data on the Web<br />Identification<br />of the data sources<br />Vocabulary<br />development<br />Generation<br />of the RDF Data<br />Publication<br />of the RDF data <br />Data cleansing<br />Linking <br />the RDF data<br />Enable effective <br />discovery<br />

7.
1. Identification and selection of the data sources<br />IGN<br />INE<br />

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2. Lightweight Ontology Development<br />WGS84 Geo Positioning: an RDF vocabulary<br />scv:Dimension<br />scv:Item<br />scv:Dataset<br />hydrographical phenomena (rivers, lakes, etc.)<br />Vocabulary for instants, intervals, durations, etc.<br />Names and international code systems for territories and groups<br />Ontology for OGC Geography Markup Language <br />Following the INSPIRE <br />(INfrastructure for SPatial InfoRmation in Europe) recommendation.<br />hydrOntology,SCOVO, FAO Geopolitcal, WGS84, GML, and Time<br />

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3. Generation of the RDF Data<br />NOR2O<br />INE<br />ODEMapster<br />IGN<br />Geometry2RDF<br />Geospatial<br />column<br />IGN<br />

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3. Generation of the RDF Data – NOR2O<br />NOR2O<br />Year<br />Industry Production Index<br />Province<br />

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3. Generation of the RDF Data – R2O & ODEMapster<br />R2O is an extensible, fully declarative language to describe mappings between relational database schemas and ontologies.<br />The ODEMapster processor generates Semantic Web instances from relational instances based on the mapping description expressed in the R2O document <br />

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3. Generation of the RDF Data – R2O & ODEMapster<br />Creation of the R2O Mappings<br />

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3. Generation of the RDF Data – R2O & ODEMapster<br />Excerpt of the R2O document<br />

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3. Generation of the RDF Data – Geometry2RDF<br />Oracle STO UTIL package <br />SELECT TO_CHAR(SDO_UTIL.TO_GML311GEOMETRY(geometry)) <br /> AS Gml311Geometry<br />FROM "BCN200"."BCN200_0301L_RIO" c<br />WHERE c.Etiqueta='Arroyo'<br />

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3. Generation of the RDF Data – Geometry2RDF<br />

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3. Generation of the RDF Data – Geometry2RDF<br />

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3. Generation of the RDF data – RDF graphs<br /> IGN INE<br />So far<br /> 7 RDF Named Graphs<br /> 1412248 triples<br />BTN25<br />BCN200<br />IPI<br />….<br />http://geo.linkeddata.es/dataset/IGN/BTN25<br />http://geo.linkeddata.es/dataset/IGN/BCN200<br />http://geo.linkeddata.es/dataset/INE/IPI<br />

18.
4. Publication of the RDF Data<br />SPARQL<br />Linked Data<br />HTML<br />Including Provenance<br />Support<br />Pubby<br />Pubby 0.3<br />Virtuoso 6.1.0<br />

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4. Publication of the RDF Data<br />

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4. Publication of the RDF Data - License<br />License for GeoLinkedData<br />Creative Commons Attribution-ShareAlike 3.0 <br />GNU Free Documentation License<br />Each dataset will have its own specific license, IGN, INE, etc.<br />

21.
5. Data cleansing<br />Lack of documentation of the IGN datasets<br />Broken links: Spain, IGN resources<br />Lack of documentation of the ontology<br />Missing english and spanish labels<br />Building a spanish ontology and importing some concepts of other ontology (in English):<br />Importing the English ontology. Add annotations like a Spanish label to them.<br /> Importing the English ontology, creating new concepts and properties with a Spanish name and map those to the English equivalents.<br /> Re-declaring the terms of the English ontology that we need (using the same URI as in the English ontology), and adding a Spanish label.<br /> Creating your own class and properties that model the same things as the English ontology. <br />select DISTINCT ?graph where {GRAPH ?graph {?s ?p ?o.}.}<br />select DISTINCT ?graph where {GRAPH ?graph {?s ?p ?o.}.}<br />

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5. Data cleansing<br />URIs in Spanish<br />http://geo.linkeddata.es/ontology/Río<br />RDF allows UTF-8 characters for URIs<br />But, Linked Data URIs has to be URLs as well<br />So, non ASCII-US characters have to be %code<br />http://geo.linkeddata.es/ontology/R%C3%ADo<br />select DISTINCT ?graph where {GRAPH ?graph {?s ?p ?o.}.}<br />select DISTINCT ?graph where {GRAPH ?graph {?s ?p ?o.}.}<br />

23.
6. Linking of the RDF Data<br />Silk - A Link Discovery Framework for the Web of Data<br />First set of links: Provinces of Spain<br />86% accuracy<br />Geonames<br />GeoLinkedData<br />DBPedia<br />

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7. Enable effective discovery<br />

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DEMO<br />http://geo.linkeddata.es/<br />

26.
Provinces<br />

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Industry Production Index – Capital of Province<br />

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Rivers<br />

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Beaches<br />

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Future Work<br />Generate more datasets from other domains, e.g. universities in Spain.<br />Identify more links to DBPedia and Geonames.<br />Cover complex geometrical information, i.e. not only Point and LineString-like data; we will also treat information representation through polygons.<br />

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Go raibh maith agaibh <br />

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GeoLinkedData<br />Asunción Gómez-Pérez, Alexander de Leon, Victor Saquicela, Luis M. Vilches, <br />Oscar Corcho, and Boris Villazón-Terrazas<br />Facultad de Informática, Universidad Politécnica de Madrid<br />Campus de Montegancedo sn, 28660 Boadilla del Monte, Madrid<br />http://www.oeg-upm.net<br />Phone: 34.91.3366605, Fax: 34.91.3524819<br />