An angle-based trajectory data compression method and device
A technology of trajectory data and compression method, applied in the direction of electrical components, code conversion, etc., can solve the problem of high cost of transmission and storage, and achieve the effect of reducing storage space and reducing errors
Active Publication Date: 2018-03-06
FUJIAN NORMAL UNIV
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Problems solved by technology
At the same time, there are also huge challenges in the management of massive data, and it takes a lot of money to transmit and store these massive trajectory data
Method used
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[0053] Implementation mode two, please refer to Figure 6 , through a practical example to illustrate the execution process of the algorithm, in which, in order to simplify the calculation process, we only perform compression processing by judging the moving direction of the track point, that is, judging the moving direction of the current track point and the moving direction of the previous collection point Whether the included angle is greater than the preset angle threshold, if yes, save the track point, that is, the track point is a collection point, if not, ignore the track point. Figure 6 is the GPS track of a moving object, and there are 10 track points P 1 -P 10 , where P1 and P10 are the starting point and end point, so they are stored; the cumulative angle θ of P3 exceeds the threshold value, and is also stored and retained; the change angles α and β of the moving directions of P4 and P6 exceed the threshold value, and are stored ; Therefore, the trajectory formed...
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The invention discloses an angle-based track data compression method and device. The angle-based track data compression method includes the steps that obtaining movement data of a current track point according to the preset frequency, wherein the movement data comprise the movement direction of the track point; judging whether an included angle formed between the movement direction of the current track point and the movement direction of a prior collecting point is larger than a preset angle threshold value or not; storing the track point if the included angle formed between the movement direction of the current track point and the movement direction of the prior collecting point is larger than the preset angle threshold value, wherein the track points are collecting points; ignoring the track point if the included angle formed between the movement direction of the current track point and the movement direction of the prior collecting point is smaller than or equal to the preset angle threshold value. By means of the angle-based track data compression method and device, the data are effectively compressed on the premise that the accuracy of the track data is guaranteed.
Description
technical field [0001] The invention relates to the field of data compression, in particular to an angle-based trajectory data compression method and device. Background technique [0002] Trajectory data is the data information obtained by sampling the motion process of one or more moving objects in the space-time environment, including the position of sampling points, sampling time, speed, etc. The data information of these sampling points constitutes trajectory data according to the order of sampling. For example, for a smart phone with a positioning function, the trajectory data reflects the mobile phone holder's action status in a certain period of time. The mobile Internet network can locate the location of the mobile phone through wireless signals, and then sample and record. By connecting the sampling points, the mobile phone holder's Motion trajectory data; GPS positioning terminal, which records the longitude and latitude information of the terminal location with a ...
Claims
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IPC IPC(8): H03M7/30
Inventor 叶阿勇郑永星许力
Owner FUJIAN NORMAL UNIV