Collision Hazard Evaluation using AIS in Tokyo Bay

Abstract

It is effective for prevention of recurrence of a marine accident particularly the collision that a ship operator grasps the risk for the accident of the target sea area. Therefore a Hazard map of Marine Accidents was made in Japan Transport Safety Board. It displays accident point on the map. Thus, a sea area in which many collisions frequently occurs can be known at a glance. Then we have analyzed an occurrence trend of collisions in Tokyo Bay and considered the utilization method of collision occurrence point information when making a navigation plan. We used only accident information so far. But dangerous encounters, such as near-miss, occur more than accidents. So we consider incidents are an important element in characteristics of target area. In this study, we have shown the potential risk area of collision where has no accidents before. Therefore, we used not only accidents' information but also AIS information. From AIS information, near miss cases were extracted. Then their density distribution, calculated by kernel estimator, displayed on a map.

Apprenticeship Learning of Ship Behavior in Crowded Area by Dimension Compression

“…The observable distance range is limited to 10 The distance to the features is quantified for each observable section. If the observed feature type is [sea], value is set to 0.…”

“…AL and a Deep Q Network (DQN) [10] are used for the behavior analysis. Following is the terminology of this research.…”