Ship trajectory compression method based on course and navigational speed change rate

A technology of ship trajectory and compression method, which is applied in the field of ship trajectory compression, can solve problems such as not considering the motion characteristics of the ship itself, and achieve the effects of improving excavation efficiency, ensuring consistency, and effective compression

Active Publication Date: 2020-04-10
TIANJIN NAVIGATION INSTR RES INST
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  • Description
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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a ship track compression method based on course and

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  • Ship trajectory compression method based on course and navigational speed change rate
  • Ship trajectory compression method based on course and navigational speed change rate
  • Ship trajectory compression method based on course and navigational speed change rate

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Embodiment Construction

[0028] The following examples are used to further illustrate the present invention. The following examples are illustrative and not restrictive. The following examples cannot be used to limit the protection scope of the present invention.

[0029] The technical scheme adopted by the present invention is:

[0030] A method for compressing ship trajectory based on the rate of change of heading and speed, which is characterized in that it comprises the following steps:

[0031] Step 1: AIS data processing: quality control of AIS data, construction of single-ship AIS time series data records;

[0032] In this embodiment, the quality control of the AIS data in the step 1 includes: deleting the data records that have obvious attribute errors in the AIS message and the same MMSI corresponding to different ship types; the construction of the AIS time series data record in the step 1 is Using the ship's MMSI as an index, splicing AIS data records according to the message broadcast sequence.

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Abstract

The invention relates to the field of ship trajectory compression, in particular to a ship trajectory compression method based on course and navigational speed change rate, which comprises the following steps: step 1, AIS data processing: performing quality control on AIS data, and constructing a single-ship AIS time series data record; step 2, coordinate system conversion: converting longitude and latitude coordinates into coordinates under a Mercator coordinate system; 3, constructing a track compression model; ship trajectory feature points are extracted by taking the navigational speed change rate and the course change rate as indexes to compress ship trajectory data; by applying the method, effective compression of the ship trajectory data is realized, the constraint indexes of the compression method consider ship position information and own motion characteristics, the consistency of ship trajectory characteristics before and after compression is ensured, and a foundation is laidfor improving the mining efficiency based on the ship trajectory data.

Description

Technical field [0001] The invention relates to the field of ship trajectory compression, in particular to a ship trajectory compression method based on the heading and speed change rate. Background technique [0002] To improve the efficiency of data mining based on ship trajectory data and reduce the consumption of computing resources. While ensuring the compression efficiency, the data elements also need to ensure the consistency of the trajectory data characteristics before and after data compression. Currently, the D-P algorithm is the main algorithm for trajectory compression, but the algorithm only considers the ship's position information. When this method is used for compression, some data features are likely to be lost. In this regard, this patent takes into account the position information and the heading and speed motion characteristics related to the ship's own motion characteristics, and uses the heading change rate within a unit distance and the speed change rate ...

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Application Information

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IPC IPC(8): G06F16/29G06F16/22
CPCG06F16/29G06F16/22
Inventor 张永兵孟凡彬孟科
Owner TIANJIN NAVIGATION INSTR RES INST
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