Visualization Research Of Navigational Collision Risk In Wuhan Bridge District

The rapid economic development has promoted the prosperity of traffic and navigation,and the tonnage of ships has gradually increased.At the same time,cross-sea bridges have been newly built and stood above the sea.On the one hand,the construction and use of bridges has improved the land transportation system,which has played a role in promoting the development of the economy;on the other hand,it has had a major impact on water transportation.Collisions in the bridge areas are frequent.which brings a huge potential safety hazard.In view of this,this paper proposes a calculation and visualization method for ship navigation collision risk in the bridge area.based on ship domain.In order to study the calculation and visualization of ship navigation collision risk in the bridge area waters,a navigational collision risk calculation model based on the ship domain is explored,and the collision risk is visualized by the heat map.Based on the preprocessing of AIS data and the classification of ship trajectories,the statistical method was used to study the ship domain in the bridge area: taking this ship as the object,the position of other ship around the ship was calculated,and the specific type of ship domain was obtained.Combined with the quaternion ship domain model,the quaternion ship domain model in the bridge area is established;on this basis,a fuzzy quaternion ship domain model was proposed and a longitudinal,lateral,and spatial collision risk calculation model was constructed based on the ship field domain;The research area is gridded,based on the space risk calculation model to realize the grid computing of collision risk and the thermal risk chart is used to visualize the collision risk.Based on the historical AIS data of the waters in Wuhan bridge district of the Yangtze River,the ship domian analysis and navigation collision risk visualization experiments were carried out.Through experiments,it has been found that the accuracy of the trajectory classification can reach 97.5% by adopting the KNN classification method;the ship field based on other vessels and the ship area based on bridge piers can be obtained by using the statistical method,and for the navigation mark,there is no obvious ship domain;after that,the navigation collision risk of the ship passing through the Baishazhou Bridge,Wuhan Yangtze River Bridge and Wuhan Tianxingzhou Bridge is visualized,and the difference in collision risk distribution when the ship passes through different bridges is obtained.Finally,based on the MFC and the Yangtze River Electronic Channel diagram,a visual platform for the traffic flow and collision risk of the bridge area was constructed.