linked open data for inspire: from 3 to 5 star geospatial data francisco j. lopez-pellicer, aneta j....

Linked Open Data for INSPIRE: From 3 to 5 star geospatial data

Francisco J. Lopez-Pellicer, Aneta J. Florczyk, Javier Nogueras-Iso, Pedro R. Muro-Medrano and F. Javier Zarazaga-Soria

INSPIRE Conference 2011, Edinburg, July 1, 2011

5 star Linked Data?

• Sir Tim Berners Lee (2010)• “This year, in order to encourage people - especially government data

owners - along the road to good linked data, I have developped this star rating system”

• Details @ http://www.w3.org/DesignIssues/LinkedData.html

• Purpose of this talk• Introduce this rating system in our context

• We’ve come part way !!! • Exemplified with datasets from Spain

• Present two 5 star Linked Data sites in Spain related to SDI nodes• Present a 5 star Linked Data recipe for INSPIRE data

1 Star

• Make your stuff available on the Web (whatever format) under an open license.

National Reference Geographic EquipmentPublic data, required attribution

Map of MTN50 catographic grid

Gazetteer

MTN50 catographic grid

Boundaries

2 Star

• Make it available as structured data (e.g., ESRI Shapefile instead of image portrayal of data).

Map of MTN50 catographic gridin png

3 Star

• Use non-proprietary formats (e.g., WKT instead of ESRI Shapefile, CSV instead of Access).

Gazetteer available only in Access format

Boundaries available only in

ESRI Shapefile format

MTN50 cartographic grid available in WKT

and ESRI Shapefile

4 Star

• Use URIs to identify things, so that people can point at your stuff (native use of RDF is not required)

(no way?)

GeoLinkedData.esinitiative makesavailable thisdata as RDF

MTN50 grid not published as RDF

5 Star

• Link your data to other data to provide context.

5 Star + Metadata

• For governement data, there should be metadata about the data itself (e.g. provenance, rights).

5 Star + Metadata + Data registry

• For governement data, their metadata should be available from an official registry (e.g. catalogue).

5 Star + Metadata + Data registry + Infrastructure

• For government data, the previous steps require a coordinate series of agreements on technology standards, institutional arrangements, and policies.

Summary

Level

On the Web • Datasets

★ • Open license (few or no limitations)

★★ • Structured data (easy to use)

★★★ • Non-propietary format (no additional license restrains)

★★★★ • URIs for things (work with the Web)• RDF data model (open standard that works with the Web)• Co-existence with other approaches (don’t replace)• Keep things simple (don’t overengineering RDF)

★★★★★ • RDF links (work with the Web)• Link to other approaches (don’t replace)

Metadata • Simple vocs. such as dcat (keeping thing simple)

Data registry • Official registry (transparency)• SPARQL (open standard that works with the Web)

Infrastructure • Agreements, Norms, Funds, Political support, …

5 Star Linked Data examples from Spain- http://geo.linkeddata.es/- http://datos.zaragoza.es/

Spanish NGI data @ http://geo.linkeddata.es/

Spanish NGI data @ http://geo.linkeddata.es/

Level

On the Web • Hydro topics of BCN200, BTN25, National Gazetteer

★ • Public data (Norm FOM/956/2008)

★★ • Vector and alphanumeric data

★★★ • Vary, including gesopatial proprietary formats

★★★★ • Developed and maintained by academia• Simple vocabulary

★★★★★ • Developed by academia• Do not link to SDI resources

Metadata • Provenance vocabulary

Data registry • CKAN (no official)

Infrastructure • National Geographic Instute (IGN) support

Saragossa City Council data @ http://datos.zaragoza.es/

Saragossa City Council data @ http://datos.zaragoza.es/

Level

On the Web • Assorted content, including data from local SDI node

★ • Law: Local statute & Law 37/2007• Web: ColorIURIS License

★★ • Points of interest and events

★★★ • Vary, including geospatial proprietary formats

★★★★ • Developed by industry, maintained by city council• Encoded as GeoRSS / RSS 1.0 = RDF• Clashes with existing Web admin practices (!)

★★★★★ • Developed by industry, maintained by city council• Do not link to SDI resources

Metadata • Dcat vocabulary

Data registry • Maintained by city council• SPARQL

Infrastructure • City council, normative and funding support

Conclusions- Do’s and don’ts about Linked Data- 5 star recipe for INSPIRE data

Conclusions: do’s and don’ts about Linked Data

• Do • Publish valuable data• Pick persistent URIs for naming

things• Dereference URIs to

representations’ URLs• Put metadata giving license and

provenance• Use RDF formats for data

transmission in addition • Use SPARQL for data and

metadata access• Keep simple• Integrate with existing systems

• Don’t• Publish all your data• Publish outdated data• Publish without explicit

license• Hide data behind forms or

applications• Publish data only in

propietary formats• Wait until you have a

complete ontology• Seek to replace existing

systems

Conclusion: 5 star recipe for INSPIRE data

Levels Topics

On the Web • INSPIRE datasets

★ • INSPIRE norms• Transposed to Web licenses

★★ • Vector data

★★★ • Representation in an open format [WE ARE ALREADY HERE!!!]

★★★★ • A simplified representation in RDF• Integrate with existing SDI geoportal/technologies

★★★★★ • Link to SDI resources

Metadata • Dcat vocabulary (crosswalk from existing metadata)

Data registry • Enable the use of SPARQL to query existing SDI catalogue

Infrastructure • Linked Data as one of the agreements of the SDI [PREREQUISITE]

Francisco J. Lopez-Pellicer

fjlopez@unizar.es

http://iaaa.cps.unizar.es/

IAAA is currently a partner in the EuroGeoSource project

http://www.eurogeosource.eu