Compressing trajectory data of a navigation device
First Claim
1. A method of compressing trajectory data comprising a plurality of trajectory points and corresponding arrival times, the trajectory data corresponding to a plurality of road segments, the method comprising:
- for each road segment,identifying, by a processor of a computer, an entry point from among the trajectory points and an entry time among the arrival times;
calculating, by the processor, an entry distance between a known point along the corresponding road segment and the entry point;
identifying, by the processor, an exit point from among the trajectory points and an exit time among the arrival times; and
calculating, by the processor, an exit distance between the known point and the exit point; and
storing, by the processor, a compressed version of the trajectory data on a computer that comprises the entry times, the entry distances, the exit times, and the exit distances,wherein the trajectory data is received from a navigation device and corresponds to movements of an entity.
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Abstract
An embodiment of the present invention provides a method for storing trajectory. The method includes: mapping, based on a plurality of positions on a trajectory of an entity, the trajectory to at least one road segment in a road network; identifying an entry point and an exit point of one of the road segments, wherein the entry point is a point where the entity starts traveling along the road segment, and the exit point is a point where the entity ends traveling along the road segment; and storing data related to at least one of the entry point and the exit point, to store the road segment as a part of information of the trajectory.
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Citations
12 Claims
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1. A method of compressing trajectory data comprising a plurality of trajectory points and corresponding arrival times, the trajectory data corresponding to a plurality of road segments, the method comprising:
for each road segment, identifying, by a processor of a computer, an entry point from among the trajectory points and an entry time among the arrival times; calculating, by the processor, an entry distance between a known point along the corresponding road segment and the entry point; identifying, by the processor, an exit point from among the trajectory points and an exit time among the arrival times; and calculating, by the processor, an exit distance between the known point and the exit point; and storing, by the processor, a compressed version of the trajectory data on a computer that comprises the entry times, the entry distances, the exit times, and the exit distances, wherein the trajectory data is received from a navigation device and corresponds to movements of an entity. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A computer system for compressing trajectory data comprising a plurality of trajectory points and corresponding arrival times, the trajectory data corresponding to a plurality of road segments, the system comprising:
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a processor configured to, for each road segment, identify an entry point from among the trajectory points and an entry time among the arrival times;
calculate an entry distance between a known point along the corresponding road segment and the entry point;
identify an exit point from among the trajectory points and an exit time among the arrival times;
calculate an exit distance between the known point and the exit point; and
generate a compressed version of the trajectory data that comprises the entry times, the entry distances, the exit times, and the exit distances; anda storage device configured to store the compressed version of the trajectory data, wherein the trajectory data is received from a navigation device and corresponds to movements of an entity. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification