说明：GPS卫星定位中很有用的接收机位置坐标转换，调试通过。
Useful in GPS satellite positioning receiver position coordinates transformation, debugging through.
在原理上，将给定的纬度和经度坐标转换为点位置是很简单的，但是要考虑到一些特殊的实际情况会使它复杂化。
In principle, turning given latitude and longitude coordinates into a point location is simple, but taking care of some of the practical contingencies makes it more complex than you might expect.
由于文件名和坐标绑定在一起，因此需要准确地将已旋转的图像块转换成适当的旋转后位置。
This development of a filename tied to a coordinate is required to accurately translate the rotated tiles to their proper post-rotation position.
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