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Abstract

The meteorological environment plays an important role when optimizing ship routing. Therefore, with the goal of obtaining meteorological environmental data associated with ship routing, an algorithm that can accurately obtain environmental data around a rhumb route in a standardized common data form is proposed. A Mercator projection is a type of equal-angle projection, and a rhumb route is a straight line on a Mercator chart. Consequently, the linear equation for a rhumb route can be achieved using the point-slope form. Based on this linear equation, points with a regular spacing whose degree is determined by the longitudinal size of the grid can be obtained. Then, the points from the Mercator chart are projected to geodetic coordinates. The extracted grids are traversed by the regularly spaced adjacent points with identical degrees of longitude on the rhumb route; therefore, the meteorological environmental data around the rhumb route can be obtained. Finally, the algorithm is executed and verified using MATLAB. The results of the experiments show that the algorithm proposed in this paper can extract wind grid data and effectively address the extraction of other meteorological environmental data. Thus, the algorithm is useful in the selection of ship routes based on a consideration of meteorological factors. I

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