Geography Reference
In-Depth Information
In order to identify the spatio-temporal hot-spots of individual phone call
locations, we calculated the space-time kernel density estimation (STKDE) of
each user's call activities. Figure 7a shows an individual's mobile phone call
activities over a week in a space-time cube. The STKDE of this user's call
activities was calculated in a spatial resolution of 500 meters and a temporal
resolution of 100 minutes. The different combinations of spatio-temporal
bandwidths result in various visual representations.
a
b
Figure 5. Space-time visualization of mobile phone users' trajectories: (a) regular
movement patterns of three individuals; (b) irregular movement pattern of an
individual.
a
Figure 6. (Continued).
