This topic introduces the basic concepts related to Trajectory SQL.
|trajectory point||The spatio-temporal object that consists of the spatial location and attributes of a moving object at a time point. The spatial location can be represented by 2D or 3D coordinates. The attributes support multiple fields of different types.|
|trajectory object||The high-dimensional object that consists of a series of trajectory points and events, including time, space, attributes, and events.|
|trajectory timeline||The time value sequence of a trajectory object.|
|trajectory spatial||The spatial geometry object of a trajectory object, which is of the linestring type.|
|trajectory leaf||The spatial location of a moving object (which is a trajectory point) at a time point.|
|trajectory attributes||The attributes of a moving object at different trajectory points, such as the velocity and direction.|
|trajectory attribute field||The attribute field of a trajectory object, such as the velocity field. The number of values of an attribute field is the same as the number of trajectory points.|
|trajectory field value||The value of a trajectory attribute field at a time point.|
|trajectory events||The events that occur in a trajectory, such as refueling, breakdown, and car lock events in the trajectory of a car. A trajectory event consists of the event type ID and event time.|
The following figure shows a trajectory object.