Detecting Suspects by Large-Scale Trajectory Patterns in the City

Table 2

Movement perspective of different groups of people.

Features	Morning (6∼9 a.m.)		Afternoon (16∼19 p.m.)		Midnight (1∼5 a.m.)
	Normal	Suspect	Normal	Suspect	Normal	Suspect
Activity scope	4.33	3.86	4.35	3.76	3.76	3.70
Trajectory length	24.90	7.58	24.43	6.87	44.59	6.46
Trajectory curve	23.49	6.65	19.03	6.67	37.28	5.22
Speed	13.67	16.41	13.28	16.50	13.36	20.41
Velocity change rate	0.22	0.20	0.18	0.22	0.15	0.19
Movement pattern	0.16	0.05	0.16	0.04	0.05	0.03
Trajectory duration	2.01	0.54	1.93	0.50	3.32	0.39
Head change rate	0.44	0.44	0.43	0.51	0.38	0.47