Prof. Dr. Jürgen Döllner


Paper accepted for IVAPP 2017

The paper "Relative Direction Change: A Topology-based Metric for Layout Stability in Treemaps" by Sebastian Hahn, Joseph Bethge and Jürgen Döllner has been accepted as a contribution to the 8th International Conference on Information Visualization Theory and Applications (IVAPP 2017) and is nominated as best student paper. The conference will be held in Porto, Portugal from the 27th of February to 1st of March and is part of the VISIGRAPP 2017 conference.



This paper presents a topology-based metric for layout stability in treemaps—the Relative Direction Change (RDC). The presented metric considers the adjacency and arrangement of single shapes in a treemap, and allows for a rotation-invariant description of layout changes between two snapshots of a dataset depicted with treemaps. A user study was conducted that shows the applicability of the Relative Direction Change in comparison and addition to established layout metrics, such as Average Distance Change (ADC) and Average AspectRatio(AAR),with respect to human perception of treemaps. This work contributes to the establishment of a more precise model for the replicable and reliable comparison of treemap layout algorithms.