Sebastian Hahn

Sebastian Hahn
Hasso Plattner Institute · Research Group Computer Graphics Systems

Dipl. Medieninf.

About

11
Publications
2,852
Reads
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96
Citations
Introduction
I'm a research assistant in the field of visualization and computer graphics. My current focus is on measuring and improving the layout-stability of treemap algorithms.
Education
October 2006 - September 2011
Ludwig-Maximilians-University of Munich
Field of study
  • Media Informatics

Publications

Publications (11)
Conference Paper
Full-text available
This paper presents an approach for hybrid treemaps, which applies and combines several different layout principles within a single tree map in contrast to traditional treemap variants based on a single layout concept. To this end, we analyze shortcomings of state-of-the-art treemap algorithms such as Moore, Voronoi and Strip layouts. Based on a nu...
Conference Paper
Full-text available
Depicting massive software system data using treemaps can result in visual clutter and increased cognitive load. This paper introduces an adaptive level-of-detail (LoD) technique that uses scoring for interactive aggregation on a per-node basis. The scoring approximates importance by degree-of-interest measures as well as screen and user-interactio...
Conference Paper
Full-text available
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 co...
Presentation
Full-text available
Depicting massive software system data using treemaps can result in visual clutter and increased cognitive load. This paper introduces an adaptive level-of-detail (LoD) technique that uses scoring for interactive aggregation on a per-node basis. The scoring approximates importance by degree-of-interest measures as well as screen and user-interactio...
Conference Paper
Full-text available
Interactive 2.5D treemaps serve as an effective tool for the visualization of attributed hierarchies, enabling exploration of non-spatial, multi-variate, hierarchical data. In this paper the suitability of sketchiness as a visual variable, e.g., to depict uncertainty, is evaluated. Therefore, a design space for sketchy rendering in 2.5D and integra...
Conference Paper
Full-text available
This paper presents a novel visualization technique for the interactive exploration of multi-threaded software systems. It combines the visualization of static system structure based on the EvoStreets approach with an additional traffic metaphor to communicate the runtime characteristics of multiple threads simultaneously. To improve visual scalabi...
Conference Paper
Full-text available
Space-restricted techniques for visualizing hierarchies generally achieve high scalability and readability (e.g., tree maps, bundle views, sunburst). However, the visualization layout directly depends on the hierarchy, that is, small changes to the hierarchy can cause wide-ranging changes to the layout. For this reason, it is difficult to use these...
Article
Full-text available
Space-restricted techniques for visualizing hierarchies generally achieve high scalability and readability (e.g., tree maps, bundle views, sunburst). However, the visualization layout directly depends on the hierarchy, that is, small changes to the hierarchy can cause wide-ranging changes to the layout. For this reason, it is difficult to use these...
Conference Paper
Full-text available
3D-Treemaps are an important visualization technique for hierarchical views. In contrast to 2D-Treemaps, height can be used to map one additional attribute of the data items. Using the Treemap technique in combination with large datasets (more than 500k) a fast rendering and interaction techniques that are beyond collapsing/uncollapsing nodes is st...
Article
Full-text available
The visualization of hierarchically ordered data has an important role in the research field of information visualization. In extension to the parent-child-relationship between nodes in such hierarchy, the encoding of additional attributes and their evolution over time results in a major challenge in this research area. To handle challenges like la...

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Projects

Projects (2)
Project
The goal is to quantify the stability and quality of treemap layout algorithms with respect to hierarchical datasets changing over time.