Trentino government linked open

geodata: first results

Pavel Shvaiko, Informatica Trentina

Feroz Farazi, University of Trento

Daniela Ferrari, Segreteria SIAT, PAT

Giuliana Ucelli, Segreteria SIAT, PAT

Lorenzino Vaccari, Joint Research Center

Vincenzo Maltese, University of Trento

Veronica Rizzi, University of Trento

A. Ivanyukovich, Trient Consulting Group

Outline

� Introduction

� Linked Data

� RDF

� Trentino Geo-data

� Publishing Pipeline

� Conversion

� Linking

� Sharing

�Mash-up application

� Conclusion

1 INSPIRE Conference – June 27th 2012 Feroz Farazi – University of Trento

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Introduction

� Open Government Data

� Data owned by the government authorities

� Making data publicly available

� Principles to comply with

� Complete, Primary

� Timely, Accessible

� Machine processable, Non discriminatory

� Non proprietary format, Open license

� Advantages

� To help the government function better; transparency, citizens’ involvement

� To leverage the data to produce new business models and opportunities

INTRODUCTION :: LINKED DATA :: RDF :: TRENTINO GEO-DATA :: PUBLISHING PIPELINE :: MASH-UP :: CONCLUSION

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Linked Data

� Linked data is about both

� Publishing data on the web

� Making links to external data sources

� The four rules

(i) URIs as the identifiers of things

(ii) HTTP URIs

(iii) Information should be served against a URI

(iv) Make links to other data sources

� 5 star rating system data(★) On the web, any format, open license (2★) Machine-readable structured data

(3★) Non-proprietary format (e.g., CSV or TSV) (4★) In RDF and SPARQL to retrieve

(5★) Linked to other external data sources

INTRODUCTION :: LINKED DATA :: RDF :: TRENTINO GEO-DATA :: PUBLISHING PIPELINE :: MASH-UP :: CONCLUSION

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RDF

� RDF (Resource Description Framework)

� A language for representing data in the Semantic Web

� a simple data model for making statements

� the capability to perform inference on the statements

� Data model in RDF

� The data model in RDF is a graph data model

� An edge with two connecting nodes form a triple

� Triple elements are subject, object and predicate

� RDF representation

� URIs to identify subjects, objects and predicates

� Objects can be Literals

INTRODUCTION :: LINKED DATA :: RDF :: TRENTINO GEO-DATA :: PUBLISHING PIPELINE :: MASH-UP :: CONCLUSION

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Trentino GeoData

� Context

� Original datasets used in the semantic geo-catalogue application

� The datasets consist of both data (shape files) and metadata (xml)

� Production of Linked Open Data

� 161 datasets were converted to RDF

� By following Open Government Data paradigm

� By following Linked Open Data paradigm

� Goal of producing Linked Open Data

� To utilize its power and potential in developing applications quickly

� To obtain insights on how the services can be improved

INTRODUCTION :: LINKED DATA :: RDF :: TRENTINO GEO-DATA :: PUBLISHING PIPELINE :: MASH-UP :: CONCLUSION

DataShape files

GeoToolsData

XML files

MetadataXML files

SAX Parser

Jena RDF

� Linking

� Links were established to external data sources (e.g., DBPedia, Freebase)

� High quality of the links were guaranteed through validating them manually

� We linked classes (e.g., lake), and entities (e.g., Lake Garda) using OWL:sameAs

� Sharing

� The produced RDF data is made available on a web server for sharing

� For each class a different RDF file is produced

� The data and metadata were published with CC-Zero license

INTRODUCTION :: LINKED DATA :: RDF :: TRENTINO GEO-DATA :: PUBLISHING PIPELINE :: MASH-UP :: CONCLUSION

� Conversion

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Publishing Pipeline

� Metadata in RDF

<rdf:Description rdf:about =

"http://www.territorio.provincia.tn.it/geodati/p_tn:piste_ciclabili">

<dc:language>it</dc:language>

<dcmibox:westlimit>10.41</dcmibox:westlimit>

<dc:identifier>http://www.naturambiente.provincia.tn.it/</dc:identifier>

<dc:format>shp</dc:format>

<dc:rights>Dato pubblico</dc:rights>

<dc:title>Piste ciclabili</dc:title>

<dc:creator>Dipartimento Risorse Forestali e Montane</dc:creator>

</rdf:Description>

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Publishing Pipeline

� Data in RDF

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<rdf:Description rdf:about="http://www.territorio.provincia.tn.it/geodati/resource/piste_ciclabili">

<rdf:type rdf:resource="http://www.w3.org/2002/07/owl#Class"/>

<owl:sameAs rdf:resource =

"http://rdf.freebase.com/ns/guid.9202a8c04000641f8000000000428308"/>

</rdf:Description>

<rdf:Description rdf:about =

"http://www.territorio.provincia.tn.it/geodati/resource/piste_ciclabili/529">

<geontology:length rdf:datatype =

"http://www.w3.org/2001/XMLSchema#double">1445.8484810675</geontology:length>

<rdfs:label xml:lang="it">Mori - torbole</rdfs:label>

<rdf:type rdf:resource="http://www.territorio.provincia.tn.it/geodati/resource/piste_ciclabili"/>

<rdfs:label xml:lang="it">529</rdfs:label>

<geo:geometry rdf:resource =

"http://www.territorio.provincia.tn.it/geodati/resource/piste_ciclabili_529"/>

</rdf:Description>

<rdf:Description rdf:about =

"http://www.territorio.provincia.tn.it/geodati/resource/piste_ciclabili_529">

<geontology:polyline>646339.346896746,5082179.74045936

…

645575.851739799,5081173.68539361

</geontology:polyline>

</rdf:Description>

Class

Instance

Geometric Shape Polyline

Structured Data Text

RDFizers for CSV, XML, Excel, …

Entity

Calais)

Entity Extractor (e.g. Calais)

Relational Database

Data Source with API

RDF StoreRDF files

CMS with RDFa Output (e.g. Drupal)

Custom Linked Data Wrapper

Linked Data Interface (e.g. Pubby)

RDB-to-RDF Wrapper (e.g. D2R)

Web Server (e.g. Apache)

Linked Data on the Web

3. Data

Sharing

2. Data Representation

1. Data Conversion

Raw Data

INTRODUCTION :: LINKED DATA :: RDF :: TRENTINO GEO-DATA :: PUBLISHING PIPELINE :: MASH-UP :: CONCLUSION

T. Heath and C. Bizer. Linked Data book (2011)

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Mash-up application

� The developed mash-up on top of the produced Linked Data

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Conclusion

�We have presented our experimental work on:

� Producing Trentino Government data as Linked Open Data

� Releasing in total 161 Trentino Government datasets

� Representation language and vocabulary

� RDF for representing both the data and metadata

� WGS84 vocabulary for data and Dublin Core for metadata

� OWL for linking to external sources such as DBPedia and Freebase

� Future work� Includes the definition of geometrical terms through the NewGeo Geometry

� publication of the datasets on the LOD cloud

INTRODUCTION :: LINKED DATA :: RDF :: TRENTINO GEO-DATA :: PUBLISHING PIPELINE :: MASH-UP :: CONCLUSION

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Thank you!