To construct a ship risk domain and analyze its characteristics,a ship domain model with risk levels is pro-posed based on Automatic Identification System(AIS)data.Firstly,the position of other ships relative to the ship is ob-tained based on the pre-processed AIS data.Then,the elliptical domain boundary is used to filter the relative position data of the ship,and the critical points representing the risk level are obtained and fitted using the least squares method to obtain the ship risk domain.Finally,the proposed method is validated using AIS data of 149 m,190 m,229 m,and 300 m ships in the Laotieshan Channel,and the characteristics of the ship risk domain are analyzed.The results show that the method can better reflect the risk level of ships;the ratio of the long and short semi-axes of the risk domain to the length of the ship differs less between ships of different scales at the same risk level;the boundary of the domain of a ship with risk level 1 is close to cir-cular;the density of other ships distributed around the ship is different.The model proposed in this study is a reference for navigation safety and security.
AIS dataelliptical domainrisk levelship risk domain model
NETL
NSTL
万方数据
