等距离正圆柱投影在极区海图中的应用研究

The Application Research of Equidistance Cylindrical Projection in Polar Nautical Chart

针对当前极区投影方式在极区海图编制及应用方面不完全适用的问题,结合现有航海图制作及使用习惯,提出了选用等距离正圆柱投影作为极区海图投影的设想,并分析了其适用性及应用方面存在的不足。重点对该投影海图使用过程中较为关注的等角航线展绘和图上方位、距离量测等应用问题进行了研究并提出相应的解决方法。同时通过具体算例,证明了所提方法的可行性,为该投影在极区海图中的应用奠定了基础。

Aiming at the problem that the current polar projections are not completely applied in producing and using polar nautical charts, combined with the existing producing and using chart methods, the paper proposes an idea of choosing equidistance cylindrical projection as the projection of polar nautical charts, and analyzes the applicability and shortage of using this projection.Some key aspects in the application process of this chart,such as rhumb line description, azimuth representation and distance measurement, are particularly studied. The corresponding solutions are also put forward. The specific examples prove the feasibility of the corresponding solutions.These methods establish a foundation for the application of projection in polar chart.