When exploring large time-varying data sets , visual summaries are a useful tool to identify time intervals of interest for further consideration .
<clarity> When exploring large time-varying data sets , visual summaries are a useful tool to identify time intervals of interest for further consideration .
The availability of devices that track moving objects has led to an explosive growth in trajectory data. When exploring the resulting large trajectory collections , visual summaries are a useful tool to identify time intervals of interest for further consideration .