The document discusses the Kadaster Knowledge Graph (KG) and LOKI system developed by Kadaster, the Dutch land registry. The KG links and integrates data from various sources to provide a unified view. It uses web standards like linked data to make the data interoperable, accessible, and reusable. LOKI is a question answering system built on top of the KG that allows users to ask questions about properties and receive location-based answers from integrated Kadaster and other data sources. The KG goes beyond traditional data publication approaches by making the data findable, accessible, interoperable, and reusable through open standards and decentralization.

1. The Kadaster Knowledge
Graph & LOKI
Ronzhin, S.; Folmer, E.; Maria, P.; Brattinga, M.; Beek, W.;
Lemmens, R.; van’t Veer, R. Kadaster Knowledge Graph:
Beyond the Fifth Star of Open Data. Information 2019, 10, 310.
https://www.mdpi.com/548974

2. ‫ן‬ Data Science Team Lead @ Kadaster
‫ן‬ Research Associate on Interoperabilty & Standards @ University of Twente
‫ן‬ Board Member @ Platform Linked Data Netherlands

4. 4 |
Dutch system of Key Registers

5. 6 |

6. The dream:
Self Service GIS

14. Data story

15. 17 |

16. 18 |
Dutch system of Key Registers

17. 19 |
Dutch Humour: System of Silos

18. 20 |

20. Can you imagine?

21. My dream!
Paleis het Loo
https://brt.basisregistraties.overheid.nl/top10nl/id/gebouw/101895841

22. Citizens want a complete overview of their environment, which includes Kadaster
data, but also municipality data, statistical data, etc. Based on the Knowledge
Graph we are able to provide this integrated view on data.

26. KG Adoptionhttps://image.slidesharecdn.com/adoption2019-190707103449/95/adoption-of-knowledge-graphs-mid-2019-1-1024.jpg?cb=1562495720

28. Essence of Kadaster KG project
It is not new, it was already possible……but expensive, not scaleable, not
open, etc...
The main differences are:
● Web standards based (linked data, interoperable)
● No spatial links, but administrative links.
● Data at the Source (in demo: 6 sparql endpoints federation)
● Application independent.

30. Demo
“Graph Browsing”

32. Demo
“Data Story”

34. Demo
LOKI

35. Source: https://www.forbes.com/sites/danwoods/2018/09/19/is-the-enterprise-knowledge-graph-going-to-finally-make-all-data-usable/#5113ba747d39

37. Solution
Loki, which houses in
Apeldoorn have a
surface of more than
100 square meters?
Location based Kadaster Information
(btw, not really chat….but more Q&A)

38. 43 |
Inleiding Doelstellingen Oplossing Projectaanpak Kosten & Baten Bijlagen

39. 44 |
Inleiding Doelstellingen Oplossing Projectaanpak Kosten & Baten Bijlagen

41. The Kadaster Knowledge
Graph & LOKI
Ronzhin, S.; Folmer, E.; Maria, P.; Brattinga, M.; Beek, W.;
Lemmens, R.; van’t Veer, R. Kadaster Knowledge Graph:
Beyond the Fifth Star of Open Data. Information 2019, 10, 310.
https://www.mdpi.com/548974

42. Some issues