Bachelor Thesis BCLR-2023-46

BibliographyDreesmann, Patrick: Evaluating linking and brushing techniques in aggregated views.
University of Stuttgart, Faculty of Computer Science, Electrical Engineering, and Information Technology, Bachelor Thesis No. 46 (2023).
64 pages, english.
Abstract

Mobile devices are used more and more in the context of information visualisation. They differ from common desktop devices in many ways, especially the display sizes and ways of interaction are anything but similar. These differences bring a lot of advantages with them, but also some challenges that need to be overcome, that were not there before. The way visualisations are designed needs to adapt. Those challenges arise especially for visualisation systems that need a lot of screen space. Multiple coordinated views are such visualisation systems because they consist of at least two visualisations and have to allow interactions with those visualisations. This bachelor’s thesis aims to conquer those hardships by proposing an approach for adapting multiple coordinated views for the use on mobile devices. The suggested strategy includes the use of an interactive main visualisation with a linked micro-visualisation. The user of the visualisation system can interact with the main visualisation by brushing data points which are then highlighted via linking in the micro-visualisation. The application of a micro-visualisation makes it possible to use most of the screen space for the main visualisation which is important for the performance of the brushing and linking interactions. Additionally, the micro-visualisation shows an aggregated view of the data to save even more screen space. In the context of this work, three prototypes are developed that realise the described approach. To evaluate the approach, one online user study per prototype was conducted to first test the general understandability of the linking and then investigate the influence of the height of the micro-visualisation on the accuracy and completion time for tasks completed with the help of the prototypes. The results show that the approach is understandable for the users. Furthermore, it is discovered that the completion time does not depend on the height of the micro-visualisation. Finally, the studies revealed, that the accuracy increases with the height of the micro-visualisation but the effect decreases once a certain height is reached. Ideally, a compromise is made to keep the accuracy as high as possible and the height as small as possible.

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Department(s)University of Stuttgart, Institute of Visualisation and Interactive Systems, Visualisation and Interactive Systems
Superviser(s)Koch, Dr. Steffen; Beck, Samuel; Huth, Franziska
Entry dateOctober 24, 2023
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