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Overcoming the catch-22 dilemma: unlocking the full potential of location-based services as Linked Open Data in real-time ecosystems.

Raf Buyle, Ziggy Vanlishout and Pieter Colpaert

(Submission #143)


The transformation of our society into a digital economy created a new context leading to changing roles where boundaries between public and private sector are fading (European Commission 2013). This creates a setting where the needs shift from machine-to-machine services to services which combine on-the-fly different information sources on the web. Businesses expect data to be live available and shared among those needing the data for dealing with today's complex societal issues (INSPIRE conference 2017). Via the interoperability program of the Flemish Government, “Open Standards for Linked Organizations” (OSLO²) the information is semantically harmonised. OSLO² is using INSPIRE and the ISA CORE Vocabularies as an interoperability facilitator and is bridging the gap between geospatial and other information. Over 4 million addresses and their coordinates are being published in line with OSLO²-semantics and the architectural principles of the semantic web (Berners-Lee 2006). The address registry is mined from the local communities, and published via a SPARQL-endpoint in ‘nearly real-time’. The aim is to link all the Flemish base registries into a controlled public sector knowledge graph. To exploit the full potential of Linked Open Data, users need to be able to query the data from different sources live via the web. Two extremes can be identified when publishing datasets: or a data dump can be provided – which puts all querying in the hands of clients – or a data service offering a querying API can be offered – which puts all querying in the hands of the data publisher. The idea of Linked Data Fragments ( studies the trade-off between effort done by data publishers having a certain server infrastructure budget, and clients, who want to be able to find answers to any possible question. Being confronted by increasing investments to create scalable services and having budget cuts creates a paradoxical situation for government administrations, a “catch-22” (Heller 1961). In a time where resources are scarce, the current business models are challenged. Therefore, in addition to the subject pages ( ) and the SPARQL-endpoint, the Flemish Government is exploring the Linked Data Fragments axis to offer geographic data fragments ( In this presentation, we share our insights in publishing a performant public sector knowledge graph which anticipates on the growing expectations of the business and the shrinking government budgets. We would like to gather feedback on our implementation and explore synergies with other reusable building blocks.


Topic Area:  [2.8] Innovation and technologies for spatial data collection, processing and integration in spatial data infrastructures (for example; Galileo/EGNOSS, Copernicus data and services, sensor web, Internet of Things, Big Data analytics)
Abstract Type:  Oral Presentation

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