1. Alexander De Leon, Boris Villazon-Terrazas, Luis M. Vilches, Victor
Saquicela
Ontology Engineering Group
Universidad Politécnica de Madrid
Madrid, Spain
jueves 7 de abril de 2011
2. Motivation
• 80% information has a geospatial part.
• GeoLinkedData is an open initiative whose
aim is to enrich the Web of Data with Spanish
geospatial data.
http://geo.linkeddata.es
2
jueves 7 de abril de 2011
3. Motivation
• It is publishing diverse information from the
National Geographic Institute (IGN) and
the National Statistics Institute (INE).
http://geo.linkeddata.es
3
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4. Linked Data Life
Cycle
Modeling Generation Publication Exploitation
4
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5. Domain Modeling
Modeling Generation Publication Exploitation
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6. Domain Modeling
• Designing the vocabularies/ontologies that
model a view of the domain at hand.
• Reuse existing vocabularies in full or partially.
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7. Geometry Model
• Simple Features Specification as base
hyerarchy of geometry types.
• Feature and Geometry are separate objects
Requirements captured at GeoVoCamp Southampton 2011 7
jueves 7 de abril de 2011
8. Geometry Model
• A feature can have multiple geometries,
geometries are parameterized (e.g. reference
system, dimension, resolution, temporal aspects)
• Different geometry representations are
resolvable via content negotiation.
Requirements captured at GeoVoCamp Southampton 2011 8
jueves 7 de abril de 2011
9. Geometry Model
• Topological relations (as per RCC8) can be
inferred or made explicit between geometries.
Requirements captured at GeoVoCamp Southampton 2011 9
jueves 7 de abril de 2011
10. Geometry Model
Simple Feature Specification 2010 OGC. 10
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11. Geometry Model
• One importante issue: How to handle order
of points in composite geometries?
• Using an order data property.
• rdf:seq
• rdf:List
• SPARQL 1.1 allows to query this.
Requirements captured at GeoVoCamp Southampton 2011 11
jueves 7 de abril de 2011
12. Data Generation
Modeling Generation Publication Exploitation
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13. Data Generation
• Adquiere data from heterogenous data sources
and transforme it to RDF using the choose
domain model;
• Or generate new data directly as RDF.
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14. Data Generation
olb ox?
ou r to •Domain independent tools:
at’s in
Wh • ODEMapster
• NOR2O
• Domain specific tools:
• geometry2rdf
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15. geometry2rdf
Generation of RDF from geospatial relational
databases.
• Configurable data model
• Support of geo datatypes in RDBMS (e.g.
Oracle, GML, WKT)
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17. geometry2rdf
Oracle STO UTIL package
SELECT TO_CHAR(SDO_UTIL.TO_GML311GEOMETRY(geometry))
AS Gml311Geometry
FROM "BCN200"."BCN200_0301L_RIO" c
WHERE c.Etiqueta='Arroyo'
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19. Data Publication
Modeling Generation Publication Exploitation
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20. Data Publication
• Make data accessible on the Web according to
the Linked Data Principles
• Make your dataset visible
• Dataset Repositories (e.g. CKAN)
• Indexing Services (e.g. Sindice, sameas.org)
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21. Data Publication
olb ox?
ou r to
h at’s in • Virtuoso
W
• Apache Webserver +
Pubby
• Snorql
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22. Exploitation
Modeling Generation Publication Exploitation
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23. Exploitation
• Develop application that unlocks the value
of the data to provide benefits to a specific
community of end users.
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24. Exploitation
olb ox?
ou r to
at’s in
Wh
• map4rdf
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25. map4rdf
Map-based visualization of RDF Linked Data
with Geospatial dimensions.
• Faceted navigation.
• Suport for complex geometries (Lines,
Polygons, etc)
• Extensible overlays (e.g. statical data)
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26. map4rdf
SPARQL map4rdf
Endpoint Server Visualization in
User’s Browser
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jueves 7 de abril de 2011
