Research And Implementation Of Preventing Typhoon Route Planning System Based On ArcGIS

With the development of economic globalization and shipping enterprises, large marine ships gradually began to dominate the international trade. In the ocean transportation, the route planning and choice must ensure both the safety of navigation under various conditions and the shortest route so as to achieve minimum shipping consumption. Along with the modern Marine information technology's increasing development, such as the geographic information system, we can use tools such as electronic chart to master all of the ocean information to realize the specific route planning. Every year dozens of typhoons pose great threaten to the ship Marine navigation and cause ship accidents in the world. Therefore, it's necessary to combine the typhoon information with the Marine information of the electronic chart, through the geographic information system to guard the safety under typhoons and economic route planning automatically.Based on Marine safety and economic route planning research, this thesis analyzes the route planning without typhoon and avoidance toward typhoon respectively. The route planning under the situation without typhoon, first of all, simplifying the bounding box obstacles such as islands with convex polygon, respectively calculating the distance of tangent line the starting point and the end point away from the obstacles and the inside and outside common tangent line between obstacles, to build the shipping route network model based on the tangent graph, thus converting route planning problem into convex polygon boundary tangent sets and obstacles of directed graph of the shortest path problem, and then according to the characteristics of the convex polygon in ocean voyage obstacles to improve the adjacency matrix of Dijkstra algorithm, figuring out the optimal routes efficiently. In case there is a typhoon, the avoidance strategy, including the ship need to choose the right time, site and route to come back to the original route, which is the planning route without typhoon,this paper, based on the principle of relative movement between ships and the typhoon, analyzes the avoidance measures by keeping the ship speed unchanged but course reverse, including the judgment of whether the ship needs to avoid and avoid timing, ensuring the ship get through the typhoon just before and after the typhoon by keeping constant speed but different direction and resume the ship's heading time and the choice of resume routes, etc.This system based on the.NET development platform and ArcGIS Engine secondary development component, employing the layout of DevExpress controls. ECDIS raw data used in this system was measured by NASA and the National Mapping Agency, electronic chart data more precise. This system demonstrates the process: the construction of the tangent graph route network model and the optimal routes produced by the improved adjacency matrix of Dijkstra algorithm, the shipping routes in accordance with the plan and avoid process as well. This system establishes the route planning system database, producing a variety of avoidance navigation scheme and management rules, analyzing and realizing various dynamic layers of ship sailing process, meanwhile this system also implements the management system and the load, amplification, narrow, roaming, eagle eye of the electronic chart and other practical functions. This system provides a scientific and reasonable auxiliary decision making tool for Marine personnel, has an important practical significance for the Marine route planning research.