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.
应用推荐