2个GPS坐标之间的角度 [英] Angle between 2 GPS Coordinates

问题描述

我正在另一个使用AR的iPhone应用程序中工作，并且我正在创建自己的框架，但我无法获得与当前设备位置相关的第二个坐标的角度，任何人都知道一个好的资源，可以帮助我与此？

I'm working in another iPhone App that uses AR, and I'm creating my own framework, but I'm having trouble trying to get the angle of a second coordinate relative to the current device position, anyone know a good resource that could help me with this?

在此先感谢！

Thanks in advance!

推荐答案

如果两点相距足够近，且远离极点，则可以使用一些简单的触发：

If the two points are close enough together, and well away from the poles, you can use some simple trig:

float dy = lat2 - lat1;
float dx = cosf(M_PI/180*lat1)*(long2 - long1);
float angle = atan2f(dy, dx);

编辑：我忘了提及 latN 和 longN - 因此 dx 和 dy - 可以以度或弧度表示，只要不混合单位。然而， angle 总是会以弧度返回。当然，如果你乘以180 / M_PI，你可以恢复到原来的水平。

I forgot to mention that latN and longN — and therefore dx and dy — can be in degrees or radians, so long as you don't mix units. angle, however, will always come back in radians. Of course, you can get it back to degrees if you multiply by 180/M_PI.

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