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Alexander De Leon, Boris Villazon-Terrazas, Luis M. Vilches, Victor Saquicela
Ontology Engineering GroupUniversidad Politécnica de Madrid
Madrid, Spain
jueves 7 de abril de 2011
Motivation
2
• 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
jueves 7 de abril de 2011
Motivation
3
• It is publishing diverse information from the
National Geographic Institute (IGN) and
the National Statistics Institute (INE).
http://geo.linkeddata.es
jueves 7 de abril de 2011
Linked Data Life Cycle
4
Modeling Generation Publication Exploitation
jueves 7 de abril de 2011
Domain Modeling
5
Modeling Generation Publication Exploitation
jueves 7 de abril de 2011
Domain Modeling
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• Designing the vocabularies/ontologies that
model a view of the domain at hand.
• Reuse existing vocabularies in full or partially.
jueves 7 de abril de 2011
Geometry Model
7
• Simple Features Specification as base
hyerarchy of geometry types.
• Feature and Geometry are separate objects
Requirements captured at GeoVoCamp Southampton 2011
jueves 7 de abril de 2011
Geometry Model
8
• 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
jueves 7 de abril de 2011
Geometry Model
9
• Topological relations (as per RCC8) can be
inferred or made explicit between geometries.
Requirements captured at GeoVoCamp Southampton 2011
jueves 7 de abril de 2011
Geometry Model
10Simple Feature Specification 2010 OGC.
jueves 7 de abril de 2011
Geometry Model
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• 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
jueves 7 de abril de 2011
Data Generation
12
Modeling Generation Publication Exploitation
jueves 7 de abril de 2011
Data Generation
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• Adquiere data from heterogenous data sources
and transforme it to RDF using the choose
domain model;
• Or generate new data directly as RDF.
jueves 7 de abril de 2011
Data Generation
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•Domain independent tools:
• ODEMapster
• NOR2O
• Domain specific tools:
• geometry2rdf
What’s in our toolbox?
jueves 7 de abril de 2011
geometry2rdf
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• Configurable data model
• Support of geo datatypes in RDBMS (e.g.
Oracle, GML, WKT)
Generation of RDF from geospatial relational
databases.
jueves 7 de abril de 2011
geometry2rdf
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jueves 7 de abril de 2011
geometry2rdf
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Oracle STO UTIL package
SELECT TO_CHAR(SDO_UTIL.TO_GML311GEOMETRY(geometry)) AS Gml311GeometryFROM "BCN200"."BCN200_0301L_RIO" cWHERE c.Etiqueta='Arroyo'
jueves 7 de abril de 2011
geometry2rdf
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jueves 7 de abril de 2011
Data Publication
19
Modeling Generation Publication Exploitation
jueves 7 de abril de 2011
Data Publication
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• 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)
jueves 7 de abril de 2011
Data Publication
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• Virtuoso
• Apache Webserver +
Pubby
• Snorql
What’s in our toolbox?
jueves 7 de abril de 2011
Exploitation
22
Modeling Generation Publication Exploitation
jueves 7 de abril de 2011
Exploitation
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• Develop application that unlocks the value
of the data to provide benefits to a specific
community of end users.
jueves 7 de abril de 2011
Exploitation
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• map4rdf
What’s in our toolbox?
jueves 7 de abril de 2011
map4rdf
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• Faceted navigation.
• Suport for complex geometries (Lines,
Polygons, etc)
• Extensible overlays (e.g. statical data)
Map-based visualization of RDF Linked Data
with Geospatial dimensions.
jueves 7 de abril de 2011
map4rdf
26
SPARQLEndpoint
map4rdfServer Visualization in
User’s Browser
jueves 7 de abril de 2011
map4rdf
27
jueves 7 de abril de 2011
map4rdf
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jueves 7 de abril de 2011
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jueves 7 de abril de 2011