说明：  实验目的 1.对AIS数据按照上行、下行船舶轨迹点进行分类。 2.掌握基于密度聚类方法原理（以DBSCAN为例）。 3.熟悉AIS数据处理的基本方法。 4.熟悉船舶运动模式辨识的基本原理和方法。 实验环境 Matlab
(Purpose 1. The AIS data are classified according to the upstream and downstream ship's track points. 2. Master the principle of density clustering based on DBSCAN as an example. 3. Familiar with the basic method of AIS data processing. 4. Familiar with the basic principles and methods of ship movement pattern identification. lab environment Matlab)