Self-adaptive threshold compression ship track compression method
An adaptive threshold and ship trajectory technology, applied in special data processing applications, electrical components, structured data retrieval, etc., can solve problems such as failure, poor compression effect, and difficult determination of threshold
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[0081] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0082] as attached figure 1 As shown, an adaptive threshold ship trajectory compression method, taking the ship trajectory of the Yangtze River Estuary as an example, the specific steps are as follows:
[0083] Step 1. Data preprocessing;
[0084] Decode the AIS of a ship in a water area, and the decoded original ship trajectory is as follows figure 2 as shown, figure 2 It is the original trajectory map of the test set of the present invention that does not clear the abnormal trajectory points, and the ship trajectory after deleting the trajectory points with no static information and abnormal ship position is as follows: image 3 as shown, image 3 The ship trajectory map after removing the abnormal trajectory for the test set of the present invention.
[0085] Step 2: Coordinate conversion of track points—convert geographic coordinates...
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