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地图投影方位投影与大圆航线

于 2022-03-07 发布 文件大小:746.69 kB
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地球面上两点间最短距离是通过两点间大圆的劣弧。在球心投影中任何大圆投影后成为 直线,因此可用于编制航空图或航海图,在航海或航空中,运用此特性而走最短距离的航线 叫大圆航线。大圆航线距离最短,但导航较困难。因此实用中通常采用长距离靠近大圆航线, 而短距离走等角航线的作法。等角航线则是指地球表面上与经线相交成相同角度的曲线。在 地球表面上除经线和纬线以外的等角航线,都是以极点为渐近点的螺旋曲线。等角航线在墨 卡托投影中表现为直线。

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