Bus trajectory: The completed movement information of
buses that collected from GPS devices from the start time
to end time when data is collected. A trajectory should be
the sets of points which include the bus spatial and temporal
information in the form of raw real-time data. The start point
and end point of a trajectory is subjective and determined
by the data collection period. The movement between two
consecutive points is assumed to be a straight-line movement.
Bus trip: A bus trip should a completed travel that covers
an appointed path. It includes the completed movement from
the starting bus stop to the terminal bus stop. It is concerned
with the real traffic condition, like congestion, operation
performance and so on. The segmented trajectory is the initial
form of a bus trip, which records the whole movement of a
bus in its appointed route.