Trajectories are shown as lines on a map display where the visual stimulus serves as a background.
Interactive operations: zooming and panning; changing the opacity level;
highlighting and filtering to select individual trajectories or subsets.
Reducing the opacity of the lines may decrease display clutter and expose concentrations of movements.
The trajectories of different users may be differently colored. By means of interactive filtering, the analyst can focus on the trajectories of individual users. It is also possible to compare trajectories of two users. Hence, the analyst can explore and compare spatial patterns of movement and search strategies of selected users.
