Page 91 - Kaleidoscope Academic Conference Proceedings 2022

THE KNOWLEDGE GRAPH AS THE INTEROPERABILITY FOUNDATION FOR AN
AUGMENTED REALITY APPLICATION: THE CASE AT THE DUTCH LAND REGISTRY

Alexandra Rowland ; Erwin J.A Folmer ; Tony Baving
1
1
2
1 University of Twente & Kadaster, The Netherlands
2 Kadaster, The Netherlands

ABSTRACT with the authoritative data published by the organization.
The approach makes use of open standards to publish the key
The concept of the knowledge graph supports insight to a registers maintained by the organization as linked data, to
given context through the provision of standards-based combine the key registers themselves under a standardized
mechanisms for accessing open and interoperable data. In schema and to make the resulting in a completely standards-
doing so, the graph uses the power of the web to integrate based KG available to developers and end users. Within this
data from distributed data sources and make this data architecture, the KG is designed to remain an application-
available to end users in a transparent, flexible and independent data source with a standardized data model and
application-independent manner, either by simply displaying applications can connect to the data source using a range of
data in the browser based on a dereference unique resource fully standardized endpoint options as an interface where
identifier or in an application built using the knowledge each standardized interface option is made available for a
graph as the source. With the latter approach, the knowledge specific target user group.
graph remains independent of the applications making use
of it as a data source, where the connection between the An example of an application which can make use of the KG
graph and the application is achieved through interfaces through a standardized interface is an Augmented Reality
1
which are completely based on open standards, most (AR) application developed for Kadaster users which
commonly through the use of a SPARQL endpoint. Indeed, provides said users with building information about a
chatbot applications often make use of the knowledge graph building which is scanned and selected using their
in this way but this paper aims to present the potential for smartphone cameras. In practice, this application performs
Augmented Reality (AR) applications to be similarly built two simple SPARQL queries on the Kadaster Knowledge
using knowledge graphs. By presenting this potential, this Graph (KKG), the results of which are available to the
paper will argue that AR applications exemplify the potential application through a SPARQL endpoint. The information
opportunities that fully open, interoperable and standards- that is made available through the application has
based approaches to data publication, such as the provenance in various key registers and external datasets
development of knowledge graphs, have and, therefore, will which are then combined in the KG and, through the simple
become key drivers within the organization in the investment SPARQL queries, made available to the application in a
of the further development of the concept of the knowledge flexible and developer-friendly manner. The interoperability
graph in the future and improved accessibility of data for end between this application in particular, and, as will be argued,
users. any application in general, is achieved through the use of
open standards both in the delivery of the KG, the interface
Keywords – augmented reality, geospatial information, between the data source and application and within the
knowledge graph, interoperability, open standards application itself.

1. INTRODUCTION The successful development and implementation of this
application for Kadaster using the architectural approach
In a recent update to the approach to linked geospatial data previously defined provides insight into the potential
publication at the Dutch Land Registry and Mapping Agency advantages and disadvantages of using this approach, both
[1], the Knowledge Graph (KG) is the central architectural from a technical and organizational perspective. Indeed, the
concept supporting interoperability between distributed data approach supports interoperability between the data source
sources and end-user applications allowing users to interact and the application in a very simple manner, one that is easily

1 https://www.kadaster.nl/ .

978-92-61-36151-8/CFP2268P @ ITU 2022 – 45 – Kaleidoscope