已知
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fdd07242906f43e4167d97a0bbcf627.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7357fed02fdb713249c262b5996eaaca.png)
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更新时间:2021-02-05 22:19:35
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【推荐1】若
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【推荐2】已知
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【推荐1】若
,且
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【推荐2】“墨卡托投影”是由荷兰地图学家墨卡托在1569年拟定,假设地球被围在一个中空圆柱里,其基准纬线与圆柱相切接触,假想地球中心有一盏灯,把球面上的图形投影到圆柱体上,再把圆柱体展开,这就是一幅“墨卡托投影”绘制出的地图.在地图上保持方向和角度的正确是“墨卡托投影”的优点,因此,“墨卡托投影”地图常用作航海图和航空图.通过地面上任意两点和地球中心作一平面,平面与地球表面相交看到的圆周就是大圆,两点之间的大圆劣弧线是两点在地面上的最短距离.沿着这段大圆劣弧线航行时的航线称为“大圆航线”.“大圆航线”转绘到“墨卡托投影”地图上为一条曲线.如图,
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中
为点
的正纬度或负纬度,
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,
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的符号确定规则如下:
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