O-D pairs between 7:00 a.m. and 8:00 a.m. (the morning rush hour in Beijing)
There have been between 66,000 and 69,000 taxis in Beijing over the last several years, almost all of which were equipped with GPS recorders. For this study, we managed to obtain three-month's worth of GPS trajectory data produced by 66,646 taxis from the Beijing Municipal Commission of Transport. The interval between two adjacent data records is one minute or several minutes, depending on the performance of the different GPS recorders. Each data record contains the following information: serial number, vehicle company, terminal ID, time label, WGS84 (World Geodetic System 1984) longitude, WGS84 latitude, mesh longitude, mesh latitude, vehicle speed, vehicle direction, vehicle state, event, and elevation. For our purposes, the most important information from the data records are terminal ID, time label, WGS84 longitude, WGS84 latitude, vehicle speed, and vehicle direction.