基于渔船轨迹数据的进出港区域识别方法

Identification Method of Port Entering and Leaving Area Based onFishing Vessel Trajectory Data

针对当前渔船进出港区域获取方法成本高、更新周期长等问题,提出了一种基于渔船轨迹数据的渔船进出港区域识别方法。首先,提出基于多特征融合下轨迹点间相似性的轨迹划分算法,将渔船轨迹划分为不同渔船行为的轨迹段;然后,提出特征距离加权-K均值聚类算法(Feature Distance Weighted-K-means clustering algorithm,FDW-K-means),将上一步得到的轨迹段特征作为聚类对象,实现渔船进出港轨迹段的提取。最后,综合运用DBSCAN(Density-Based Spatial Clustering of Applications with Noise)聚类算法和Del-Alpha-Shape算法对聚集的渔船进出港轨迹段轨迹点集进行边界提取获得渔船进出港区域。以椒江渔港和博贺渔港2021年3月的渔船轨迹数据为例,识别到椒江渔港和博贺渔港的渔船进出港区域的正确率分别为94.2%和95.8%。与使用K-means聚类算法或传统基于对各特征设定约束条件思想提取轨迹段的方法相比,该方法识别到的渔港渔船进出港区域正确率分别提高了10.7%,8.7%和9.5%,6.6%。实验结果表明所提方法能够有效识别渔船进出港区域,其结果能为渔船进出港监管提供科学参考。

In view of the problems such as high acquisition cost and long update period,a new method based on fishing vessel trajectory data was proposed to identify port fishing vessel entering and exiting area.Firstly,a trajectory partitioning algorithm based on the similarity between trajectory points under multi-feature fusion was proposed.The fishing vessel trajectory data was divided into trajectory subsegments with different behaviors.Then,the Feature Distance Weighted-K-means clustering algorithm(FDW-K-means)was proposed to cluster the features of trajectory segment,and the trajectory segments of fishing vessel entering and leaving were obtained.Finally,the DBSCAN clustering algorithm and Del-Alpha-Shape algorithm were used to extract the boundary of the gathered data set of the entering and leaving trajectory segment of fishing vessel to obtain the port fishing vessel entering and leaving area.Based on the fishing vessel trajectory data collected in March 2021 at Jiaojiang Fishing port and Bohe fishing port,the accuracy of fishing vessel entering and exiting area was 94.2%and 95.8%,respectively.Compared with K-means or the traditional method based on the idea of setting the threshold value of features,the accuracy of extracting the entering and exiting area of fishing vessel in the two fishing ports was increased by 10.7%,8.7%and 9.5%,6.6%,respectively.The experimental result shows that the proposed method can effectively extract the port entering and leaving area of fishing vessel,which can provide scientific reference for the supervision of fishing vessel entering and leaving the port.