why geospatial linked open data for smart mobility
TRANSCRIPT
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SPATIAL APPLICATIONS DIVISION
Why Geospatial Linked Open
Data for Smart Mobility ?
Anuja Dangol, Valerie Dewaelheyns, Thérèse Steenberghen
Spatial Applications Division Leuven (SADL)
Department of Earth and Environmental Sciences
REALCORP2016, Hamburg
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Overview
• Introduction:
- smart mobility and linked open Data
- why geospatial Linked Open Data (LOD) for smart mobility?
• Use Case
- cycling infrastructure in Flanders as Geospatial LOD
• Result
- standardized workflow for conversion to LOD
• Discussion and Conclusion :
- challenges and Way forward
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Introduction
Smart mobility and Linked Open Data
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SPATIAL APPLICATIONS DIVISION
Belgium: need for evolution towards smart mobility
Congested traffic , road accidents, accidental deaths
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SPATIAL APPLICATIONS DIVISION
Smart Mobility
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SPATIAL APPLICATIONS DIVISION
Why geospatial Linked Open Data for smart mobility?
Open Data and Data interoperability
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A set of design principles for sharing machine-readable data on the Web
for use by public administrations, business and citizens.(ISA European Commission, 2013)
Linked Open Data (LOD)
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LOD Principles
1. Use Uniform Resource Identifiers (URIs) as names of things
http://nl.dbpedia.org/resource/Fietspad
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SPATIAL APPLICATIONS DIVISION
LOD Principles
1. Use Uniform Resource Identifiers (URIs) as names of things
2. Publish it on web using standard protocols ( HTTP URI) :
people can look up those names
HTTP URI : http://nl.dbpedia.org/resource/Fietspad
3. When someone looks up a URI,
provide useful information, using the standards
(RDF, SPARQL)
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SPATIAL APPLICATIONS DIVISION
LOD Principles
Subject (a URI),
Predicate (Relationship) and
Object (a URI/ Literal)
SPARQL Protocol and RDF Query Language
“Cycling Lane is the type of Cycling Infrastructure”
Dbpedia-
nl:Fietspad
Dbpedia-
nl:Categoria:
Fietsinfratru
ctuur
rdf:type
Subject Predicate Object
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SPATIAL APPLICATIONS DIVISION
1. Use Uniform Resource Identifiers (URIs) as names of things
2. Publish it on web using standard protocols ( HTTP URI) : people can look up those
names
3. When someone looks up a URI, provide useful information, using the standards
(RDF, SPARQL)
4. Include links to other URIs to allow discovery of more things
Links at instance level (rdfs:seeAlso, owl:sameAs)
Dbpedia-
nl:Fietspad
Dbpedia:Se
gregated_cy
cle_facilities
owl:sameAs
LOD Principles
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SPATIAL APPLICATIONS DIVISION
Ontologies
• Syntax, Semantics, Taxonomy(classification), Thesauri(Associations),
Ontology(Rules).
“Formal, explicit specifications of a shared conceptualization”
Studer (1998)
• Conceptualization: describe a concept: car, person, love, hate
• Explicit: All concepts must be defined
• Formal: Machine understandable
• Shared: Consensus about the ontology
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Publishing Linked Open Data
14
5-star schema of Linked (Open) Data
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Use case
Cycling infrastructure in Flanders
Belgium as Geospatial LOD
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Data
• Cycling infrastructure data: Supra-local Functional
Cycling Route network
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SPATIAL APPLICATIONS DIVISION
Geospatial Linked Data
GEOSPARQL
• An RDF/OWL
vocabulary for
representing spatial
information;
• A set of functions for
spatial calculation
Source: GeoSPARQL ontology. Source: Koubarakis and Kyzirakos (2012)
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SPATIAL APPLICATIONS DIVISION
The process
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RESULT
Standardized workflow for conversion
to LOD
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SPATIAL APPLICATIONS DIVISION
Standardized Workflow
• Created in BPMN for publishing of the cycling infrastructure data as
Geospatial Linked Open Data
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SPATIAL APPLICATIONS DIVISION
Ontology design sub-process
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SPATIAL APPLICATIONS DIVISION
Ontology design sub-process
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SPATIAL APPLICATIONS DIVISION
Linked Data Generation
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SPATIAL APPLICATIONS DIVISION
Linked Data Generation
R2RML Mapping RDF Conversion
• Geotriples: n-triples, ttl, json
< Subject > < Predicate > < Object >
<http://www.verkeersveiligheidsmonitor.be/www.ver
keersveiligheidsmonitor.be/data/cyclinginfrastructure/
Geometry/820>
<http://www.opengis.net/ont/geosparql#asWKT>
"<http://www.opengis.net/def/crs/EPSG/0/4326>
MULTILINESTRING((4.92600946638259
51.3269502191978,4.92618826130224
51.3269427799245))"^^<http://www.opengis.net/ont/
geosparql#wktLiteral> .
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SPATIAL APPLICATIONS DIVISION
Publication
www.mobiliteitsmonitor.be
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SPATIAL APPLICATIONS DIVISION
Geo-Linked data Provider
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Discussion and
Conclusion
Challenges and Way forward
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SPATIAL APPLICATIONS DIVISION
Lesson Learned: Geospatial LOD
• Initial stage of development
• Different software tends to use different vocabularies
• Broken links
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SPATIAL APPLICATIONS DIVISION
Smart Mobilty: Road ahead
• Combining and accessing data from
different sources---Best practice LOD
o Involving citizens: dangerous cycling path (not
registered in Road accidents statistics ) crowd
sourcing
o Suitability for new type: mobility scooters,
o Real- time traffic information
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The Flemish Policy Support Centre on
Road Safety (2012-2015) funded this
research. The views expressed in this
paper are not necessarily those of the
Flemish Government.
@2016 Urban Logistics and Mobility
Funded by IWT-SBO- Research Project Urban
Logistics and Mobility. Project partners :
Antwerp University, UHasselt, KU Leuven,
UGent en VUB.