实现的方法是缩放到一个整数的缩放级别(可尝试一个任意的固定比例尺以便观看不同值的效果)并通过纬度和经度定义一个点。
You do this by zooming to an integer zoom level (an arbitrary fixed-scale experiment to see the effect of different values) and defining a point by latitude and longitude.
如果有一条线和赤道线平行，而且经过尺的顶端，这条线和尺的夹角就等于纬度。
If there is a line passing the top of the ruler, and parallel to the equator, then the Angle between the line and the ruler is equal to the latitude here.
如果有一条线和赤道线平行，而且经过尺的顶端，这条线和尺的夹角就等于纬度。
If there is a line passing the top of the ruler, and parallel to the equator, then the Angle between the line and the ruler is equal to the latitude here.
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