Diploma and Master Theses (authored and supervised):

K. Han:
"Online visualization of multi-dimensional spatio-temporal data - Visualization of weather data of Germany in a large time scale";
Supervisor: J. Jahnke, J. Wilkening, G. Gartner; Department of Civil, Geo and Environmental Engineering, Technische Univ. München, 2018; final examination: 2018-04-26.

English abstract:
Time has always been a challenge for cartographers to visualize in maps. Many methods to visualize the time parameter in maps have been proposed, including animated maps, static time map series. The evolvement of computer technologies has offered opportunities for cartographers to map using various media, which has meanwhile brought the need of developing novel visualization methods. Among the mapping media and technologies, web mapping has become rather important and popular, thanks to its wide accessibility to the users and its flexibilities.
The overall goal of the thesis is to develop methodolody to visualize multi-dimentsional spatio-temporal data, and to fill in the gap of assesing the performance of the applied techniques. An interactive map that combines animated map, static map, and chart to present multi-dimensional spatio-temporal data is built, with the help of up-to-date web mapping technologies. In the case study, weather data of Germany is applied, owing to its characteristics of multi-dimension and time-sensitivity.
For the purpose of accessing the utility and usability of the map, map evaluation is conducted. The evaluation is based on the theoretical background of eye-tracking technique and analysis. Users are gathered to view the map in two major phases of free-examination task and goal-directed task, during which their eye-movements are collected, as well as the response to the designed questions. The evaluation results contain area of interst analysis, performances among different groups of users, accuracy and efficiency when the users answer the questions. Threfore, conclusions are drawn based on the results, including user preference, utility of each component in the map, gender difference, etc.. It is found that animated map and chart generate different types of information in a spatio-temporal scenario. Animated map generates information regionally, while chart renders better overall and quantitative information. The usage of animated map longer than a possible time threshold could cause congnitive overload for the users. Concerning the gender of the users, animated map is more appealing to female, while chart is rather preferred by male than female.

multi-dimensional, spatio-temporal, web mapping, animated map, map evaluation, map utility, eye-tracking technique

Created from the Publication Database of the Vienna University of Technology.