Jiří Chmelík

Human-Computer Interaction in Real-3D and Pseudo-3D Cartographic Visualization: A Comparative Study

This chapter summarizes the results of an experiment performed as basic research on the three-dimensional (3D) display of geographical information using two alternative control devices (a Wii remote controller and a mouse). The aim was to explore the influence of a specific type of visualization on the human understanding of depicted geographical information and to discover which type of display—real 3D or pseudo-3D combined with a Wii remote controller and a computer mouse—can be considered better for working with geographical bases. The research was set up as an exploratory analysis and examined the performance of 17 participants. As expected, there were differences in the results between the types of visualization and devices used. Real-3D visualization appeared faster but less suitable for the successful management of tasks than the pseudo-3D visualization. We found no significant differences based on the controlling device when elaborating tasks, but we believe the Wii remote controller device to be a promising device for future studies.

When the Display Matters: A Multifaceted Perspective on 3D Geovisualizations

Abstract This study explores the influence of stereoscopic (real) 3D and monoscopic (pseudo) 3D visualization on the human ability to reckon altitude information in noninteractive and interactive 3D geovisualizations. A two phased experiment was carried out to compare the performance of two groups of participants, one of them using the real 3D and the other one pseudo 3D visualization of geographical data. A homogeneous group of 61 psychology students, inexperienced in processing of geographical data, were tested with respect to their efficiency at identifying altitudes of the displayed landscape. The first phase of the experiment was designed as non-interactive, where static 3D visual displayswere presented; the second phase was designed as interactive and the participants were allowed to explore the scene by adjusting the position of the virtual camera. The investigated variables included accuracy at altitude identification, time demands and the amount of the participant’s motor activity performed during interaction with geovisualization. The interface was created using a Motion Capture system, Wii Remote Controller, widescreen projection and the passive Dolby 3D technology (for real 3D vision). The real 3D visual display was shown to significantly increase the accuracy of the landscape altitude identification in non-interactive tasks. As expected, in the interactive phase there were differences in accuracy flattened out between groups due to the possibility of interaction, with no other statistically significant differences in completion times or motor activity. The increased number of omitted objects in real 3D condition was further subjected to an exploratory analysis.

Identification of altitude profiles in 3D geovisualizations: the role of interaction and spatial abilities

ABSTRACT Three-dimensional geovisualizations are currently pushed both by technological development and by the demands of experts in various applied areas. In the presented empirical study, we compared the features of real 3D (stereoscopic) versus pseudo 3D (monoscopic) geovisualizations in static and interactive digital elevation models. We tested 39 high-school students in their ability to identify the correct terrain profile from digital elevation models. Students’ performance was recorded and further analysed with respect to their spatial abilities, which were measured by a psychological mental rotation test and think aloud protocol. The results of the study indicated that the influence of the type of 3D visualization (monoscopic/stereoscopic) on the performance of the users is not clear, the level of navigational interactivity has significant influence on the usability of a particular 3D visualization, and finally no influences of the spatial abilities on the performance of the user within the 3D environment were identified.

VEAAR: virtual environment for archaeological artefacts restoration

This demo presents a virtual environment for assembling archaeological artefacts from 3D scanned fragments. We have implemented a set of interaction techniques tailored to this specific task, allowing users to examine, manipulate and assemble fragments to obtain the original shape of the object. The tool is developed and continuously tested by domain experts from the field of anthropology. The presented pilot user study confirms our initial expectation that the restoration process using a virtual environments can be significantly faster than restoration done in a desktop environment keeping the same level of assembly precision.