中国海岸带专用地图投影设计

Map Projection Design for China Coastal Zone

地图投影是各类海岸带信息的空间定位框架要素之一。通过对目前我国海岸带常用的各种地图投影现状分析,设计并实现全国海岸带专用投影———斜轴等角圆锥投影,该投影不仅使得整个中国海岸带实现无缝的一体化表达,而且使变形达到最小。文中详细阐述该投影的设计思想和设计原理,并将结果与其他各种海岸带投影进行详细的分析比较。

The present study focuses on a design of map projection that serves as one of the important components of geospatial reference framework for establishing coastal zone information. Through examining the current statues of map projections for China coastal zone, this study reveals that the former results can neither demonstrate the projection as an integrated one for whole China coastal zone, nor approach as a minimal mapping distortion. Therefore, the authors aim at a special design that can apply to obtaining oblique conic projection for China coastal zone. Since the map projection＇ s stand-line tends to adapt itself to the overall shape of the China coastline, the whole China coastal zone can reach the least distortion, with mapped area seamless. This paper also introduces design procedure, including method application, which helped calculate the meta-pole and stand-line, after comparing the oblique conic proiection with other proiections used in China coastal zone.