Moving point; Trajectory
Representation of a time-dependent position observed over some period of time. Usually represented as a polyline in a 3D (2D + time) space for an object moving in the 2D plane.
Trajectories describe complete histories of movement; they are stored in moving objects databases, sometimes called trajectory databases in the literature.
When operations are included, a trajectory corresponds to a value of a moving point data type. Queries on databases containing trajectories can be formulated using moving object languages. When uncertainty about an object’s precise position is taken into account, an uncertain trajectory  results which can be viewed as a kind of cylindrical volume in the 2D + time space. There exists a lot of work on indexing trajectories . Querying for trajectories similar to a given one is also an important research area .
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