1. Publishing Ordnance Survey Ireland's geospatial data as Linked Data
Prof. Declan O’Sullivan
School of Computer Science and Statistics
Trinity College Dublin, Ireland
The ADAPT Centre is funded under the SFI Research Centres Programme (Grant 13/RC/2106) and is co-funded under the European Regional Development Fund.

2. Geopspatial Linked Data Project co-funded with Ordnance Survey Ireland (OSi)
Goal: Develop a semantic architecture and Linked Data platform for the OSi taking into account best practices and guidelines in the domain of geospatial information and industry and OSi’s current technology stack.
Started with the boundaries dataset, which was open and already available on data.gov.ie, but not as Linked Data.

3. OSi’s authoritative geospatial platform
Over 50 million uniquely reference features
Single source of truth (scale independent)
Maintained object lifecycles
Real world data model
Non-proprietary
Based on industry standards

4. What had to be done? Features and Geometries with GeoSPARQL
Modelling Provenance of Statute Instruments with PROV-O
Ontologies developed and published
Workshops and agreement with DPER and CSO on URI Strategy
Uplift the Prime2 data into RDF with declarative R2RML mappings
GeoSPARQL Reference
W3C R2RML Reference

5. Architecture of the LD Platform
Linked Data
Frontend (Pubby)
Proxy Server
Application or Web Browser
Triple Pattern Fragments Server
Triple Pattern Fragments Web Client
Triple Pattern Fragments Client
RDF /Turtle Data Dumps
Ontologies
Web Browser
SPARQL EndPoint
TripleStore (Parliament)
R2RML Mappings
PRIME 2
(Oracle)
5 STAR LINKED OPEN DATA STATUS ACHIEVED

6. Uplift from RDB to RDF COUNTY (table in CSV) R2RML Mapping
GUID
FIRST_CO_ENGLISH
FIRST_CO_GAEILGE
GEOM
2AE A3E
CAVAN
An Cabhán
POLYGON (( ))
2AE E13A3E
WICKLOW
Cill Mhantáin
MULTIPOLYGON ((( … )))
2AE A3E
ROSCOMMON
Ros Comáin
POLYGON (( ))
R2RML Mapping
<#TriplesMap1>
rr:logicalTable [ rr:tableName "COUNTY" ; ] ;
rr:subjectMap [ rr:template " ;
rr:class geohive:County ; ];
rr:predicateObjectMap [ rr:predicate rdfs:label ;
rr:objectMap [ rr:column "FIRST_CO_ENGLISH" ;
rr:language "en" ;]; ];
rr:objectMap [ rr:column "FIRST_CO_GAEILGE" ;
rr:language "ga" ;]; ];
rr:predicateObjectMap [ rr:predicate geo:hasGeometry ;
rr:objectMap [ rr:parentTriplesMap <#TriplesMap2> ;
rr:joinCondition [ rr:child "GUID" ; rr:parent "GUID" ;] ]; ].
<#TriplesMap2>
rr:logicalTable [ rr:tableName "COUNTY" ; ];
rr:subjectMap [ rr:class geo:Geometry ;
rr:termType rr:BlankNode ;
rr:column "GUID" ; ];
rr:predicateObjectMap [ rr:predicate geo:asWKT ;
rr:objectMap [ rr:column "GEOM" ;
rr:datatype geo:wktLiteral ;] ].
< a geohive:County ;
rdfs:label , "An ;
geo:hasGeometry [ a geo:Geometry ;
geo:asWKT "POLYGON (( )"^^geo:wktLiteral ] .
Generated RDF in Turtle
format

7. Sample generated RDF in Data Dump

8. Parliament Triple store and SPARQL processor
Supports reasoning, but importantly supports GeoSPARQL (OGC standard)
Provides functions over geometries (within, touches, distance etc.)
Useful for geospatial analyses
Parliament Reference

9. data.geohive.ie

10. Pubby Provides a front end for Linked Data Sits on a SPARQL endpoint
RDF browser access data
Publish on web for human and machine consumption
Flexible and customisable
Pubby Reference

11. Implementation: Linked Data Frontend
Description of County Clare
linking to its three representations

12. Implementation: Linked Data Frontend
Default generalization
with OSi’s base map.
Different representations

13. Triple Pattern Fragments
Query Linked Data with less load on server
Reduce server side processing load as client does more
TPF client and server communicate
User writes query on client which sends triple pattern requests to server
Server sends back data based on triple pattern to client
Client then performs processing intense parts over the returned data
Triple Pattern Fragments Reference

14. Implementation: Triple Pattern Fragment Client

15. Proof of Concepts

16. Proof of Concept: Access Control to Closed Linked Data
Licenses: data customer can access
Templates: SPARQL based template than can be used for access
Template Selector: shows allowed templates (based on licenses)
Template Analyser: checks template variables against license
SPARQL Processor
Templates and Licenses (RDF)
Access Control Module
RESTful API
Template Selector
Template Analyser
Query Processor
SPARQL Processor
GeoHive (RDF)
Related research paper under submission to ESWC 2018 4

17. Proof of Concept: OSi and Building Information Modelling
Building Information Modelling (BIM) is a key enabler for integrating building data across a buildings life cycle (BLC) and with other related data sources
energy, occupancy, weather, etc.
Ordnance Survey Ireland (OSi) Prime2, includes not only GIS data, but also additional building specific data (form and function).
Uplifting this building data will provide an authoritative basis for interlinking data about buildings in Ireland
supporting an iterative approach to generating BIM and opening up additional markets for OSi.
Research Paper Reference

18. Integrating OSi Building Data based on Geolocation
THE VISION
Data Uplift
Tabular
Data
Identify Alignments
Generate
RDF
Data in RDF
(OSi Building + CSO Data)
Data Conversion
IFC STEP
Ifc->owl
Ifcowl- > ifcowl_geo
IFC in RDF with added Geolocation
Data Conversion
DBPedia
RDF
SPARQL
CONSTRUCT
DBpedia with added Geolocation
Integrated Building Information
OSi-Geometry: Footprint
OSi-Form: Building General
OSi-Function: Residence
LD DBpedia: Info on Architect
LD IFC: Structure (walls, windows, materials, etc.), Control Systems, Electrical Systems, etc.
Integrated BIM with Authoritative OSi
RDF Representations with added geolocation to support geospatial functions

19. Other Prototype Tools under development

20. Juma Uplift
Visual tool to create and edit uplift mappings from relational to RDF
Uses Blocky: mappings created by connecting blocks together
Export mappings as R2RML, SML and more.
Reference Research Paper and Demo Videos:

21. SUMMR Interlink Validation Tool
SPARQL Usage for Mapping Maintenance and Reuse
SPARQL templates for maintenance and reuse
SUMMR Interlink Validation Tool
Facilitates template for discovering invalid interlinks
From a source dataset to multiple target dataset
Used in DBpedia quality activity during annual release process
Reference Research Paper:
Demo Video:

22. With thanks to the Team Ordnance Survey Ireland (OSi)
Lorraine McNerney
Eamonn Clinton
Trinity College Dublin
Rob Brennan
Senior Research Fellow
Christophe
Debruyne
Research
Fellow
Kris McGlinn
Research Fellow
Alan Meehan Research Fellow
Darragh Blake
DLAB
Research Engineer
Aoife
Brady
DLAB Project Manager