http://dl.gi.de/handle/20.500.12116/39744 2026-07-23T10:50:40Z http://dl.gi.de/handle/20.500.12116/39768 Robust visualization of trajectory data Zhang, Ying; Klein, Karsten; Deussen, Oliver; Gutschlag, Theodor; Storandt,Sabine The analysis of movement trajectories plays a central role in many application areas, such as traffic management, sports analysis, and collective behavior research, where large and complex trajectory data sets are routinely collected these days. While automated analysis methods are available to extract characteristics of trajectories such as statistics on the geometry, movement patterns, and locations that might be associated with important events, human inspection is still required to interpret the results, derive parameters for the analysis, compare trajectories and patterns, and to further interpret the impact factors that influence trajectory shapes and their underlying movement processes. Every step in the acquisition and analysis pipeline might introduce artifacts or alterate trajectory features, which might bias the human interpretation or confound the automated analysis. Thus, visualization methods as well as the visualizations themselves need to take into account the corresponding factors in order to allow sound interpretation without adding or removing important trajectory features or putting a large strain on the analyst. In this paper, we provide an overview of the challenges arising in robust trajectory visualization tasks. We then discuss several methods that contribute to improved visualizations. In particular, we present practical algorithms for simplifying trajectory sets that take semantic and uncertainty information directly into account. Furthermore, we describe a complementary approach that allows to visualize the uncertainty along with the trajectories. 2022-01-01T00:00:00Z http://dl.gi.de/handle/20.500.12116/39766 Immersive analytics: An overview Klein, Karsten; Sedlmair, Michael; Schreiber, Falk Immersive Analytics is concerned with the systematic examination of the benefits and challenges of using immersive environments for data analysis, and the development of corresponding designs that improve the quality and efficiency of the analysis process. While immersive technologies are now broadly available, practical solutions haven’t received broad acceptance in real-world applications outside of several core areas, and proper guidelines on the design of such solutions are still under development. Both fundamental research and applications bring together topics and questions from several fields, and open a wide range of directions regarding underlying theory, evidence from user studies, and practical solutions tailored towards the requirements of application areas. We give an overview on the concepts, topics, research questions, and challenges. 2022-01-01T00:00:00Z http://dl.gi.de/handle/20.500.12116/39767 Machine learning meets visualization – Experiences and lessons learned Quang Ngo, Quynh; Dennig, Frederik L.; Keim,; Sedlmair, Michael In this article, we discuss how Visualization (VIS) with Machine Learning (ML) could mutually benefit from each other. We do so through the lens of our own experience working at this intersection for the last decade. Particularly we focus on describing how VIS supports explaining ML models and aids ML-based Dimensionality Reduction techniques in solving tasks such as parameter space analysis. In the other direction, we discuss approaches showing how ML helps improve VIS, such as applying ML-based automation to improve visualization design. Based on the examples and our own perspective, we describe a number of open research challenges that we frequently encountered in our endeavors to combine ML and VIS. 2022-01-01T00:00:00Z http://dl.gi.de/handle/20.500.12116/39763 Uncertainty visualization: Fundamentals and recent developments Hägele, David; Schulz, Christoph; Beschle, Cedric; Booth, Hannah; Butt, Miriam; Barth, Andrea; Deussen, Oliver; Weiskopf, Daniel This paper provides a brief overview of uncertainty visualization along with some fundamental considerations on uncertainty propagation and modeling. Starting from the visualization pipeline, we discuss how the different stages along this pipeline can be affected by uncertainty and how they can deal with this and propagate uncertainty information to subsequent processing steps. We illustrate recent advances in the field with a number of examples from a wide range of applications: uncertainty visualization of hierarchical data, multivariate time series, stochastic partial differential equations, and data from linguistic annotation. 2022-01-01T00:00:00Z