Table 1. Records of one cellphone user in the mobile phone data.

User ID	Timestamp	Longitude	Latitude
0****317af5a17	00:13:44	113.891	22.585
0****317af5a17	01:11:10	113.891	22.585
0****317af5a17	13:10:59	114.083	22.544
0****317af5a17	23:34:57	113.891	22.585