Nowadays, GPS-enabled devices are used daily. Some examples are smartphones, GPS watches and navigation systems. The confidence in those devices is usually very high. But how accurate is the GPS-positioning of navigation systems, or how good can the distance of a jogging route be recorded with the tracking function of a fitness watch. The lack of knowledge about those accuracies and other aspects is called uncertainty in datasets. There are uncertainties in onroad data and offroad data.
This thesis deals with the topic of visualization of uncertainties in onroad and offroad trajectories. For this purpose, two records (onroad and offroad) are used to find specific cases with uncertainties. The onroad data describes taxi rides in New York City, while the offroad data contains information about GPS flight routes of storks. Several routes are created out of the two examples. Those routes are later visualized with their uncertainties in maps. The uncertainties always exist in the routing between two points. For the taxi data it is the unknown driven route (only start and end of the route are known) and for the stork data it is the uncertain trajectory in a GPS gap. Various methods are tested for their qualification for uncertainty visualization in both data sets (onroad/offroad data set). Furthermore, it will be examined if there are significant differences in the selection and execution of those visualization techniques for onroad and offroad trajectories.
The results of this thesis solve the question of the qualification and differences of the selected design options. A difference in the uncertainty visualization of onroad and offroad trajectories can be seen in the method of the uncertainty corridors. This method is well suited for offroad visualization because the corridor describes an area where the stork would most likely be in a GPS gap. The uncertainties of a driven onroad route, however, cannot be represented with this method, since the uncertainties do not affect the route itself (road is not uncertain), but it is not known which route was driven. Another insight is that there is no universal visualization method for uncertainties.
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Nowadays, GPS-enabled devices are used daily. Some examples are smartphones, GPS watches and navigation systems. The confidence in those devices is usually very high. But how accurate is the GPS-positioning of navigation systems, or how good can the distance of a jogging route be recorded with the tracking function of a fitness watch. The lack of knowledge about those accuracies and other aspects is called uncertainty in datasets. There are uncertainties in onroad data and offroad data.
This th...
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