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Analysis Method of Accessibility of Rescue at Sea Based on CA

Rescue accessibility research has important decision-making significance for rescue at sea, which not only improves the ability to solve maritime emergency, but also reflects a country's search and rescue capability. The accessibility of rescue can be expressed as the ratio between the rescue distance and the speed of rescue, that is, the time to save the cost. At present, the rescue distance is calculated by the traditional Euclidean distance, which is ignoring the problem of barriers in the path, resulting in the error of the rescue distance in some areas neither. Therefore, the accessibility result of the rescue is also not very exactly accurate. To solve this problem, this paper takes the South China Sea as an example, and proposes a Cellular Automaton (CA) based on computing method. Combined with the spatial analysis function of GIS, we get the accessibility of 9 rescue stations in the South China Sea and analyze their spatial distribution characteristics. By comparing the traditional accessibility calculation method, it is proved that the method is feasible and the result is more accurate. The results show that the CA based accessibility analysis method can demonstrate the computation process of rescue accessibility through the state of cells, and solve the problems of barrier reefs in the process of rescue distance calculation. According to the rescue accessibility calculated, we can draw the conclusion that the northern waters of the South China Sea rescue gets higher accessibility, the Zhongsha, Xisha and Dongsha Islands relief accessibility is mostly within 2 hours. The accessibility of the Spratly Islands sea area is low, and it is necessary to increase the construction of the rescue base there.