Table 1.

OBD partial data parameter description.

Data field	Data description
Vid	The unique license plate number of a car
Gps_time	The sampling time of sampling point, the representing form is ’yyyy-/MM/-dd HH:mm:ss’
Lon	Longitude (*1,000,000), accurate to 6 decimal places
Lat	Latitude (*1,000,000), accurate to 6 decimal places
Speed	Speed: 0.1 km/h
Mile	Mileage: 0.1 km
Dir	Direction: 0–359, true north is 0, clockwise
Operstate	The passenger status of the taxi at the current sampling point
ClusterId	The cluster ordinal number (0: unclassified, − 1: noise point, positive number: ordinal number)