How Google Maps API calculates meters with coordinates?

Question

I found this issue while experimenting with shapes. As written in documentation, we can draw circle with radius specified in meters. But Google Maps use cylindrical projection of the Earth (edit: ok, it doesn't), so logically, in Arctic regions our circles should be something similar to ellipse. So I conducted simple experiment and drew a circle near The Egde. That's the result:

As we can see, we still have a circle.

So, my question is, how Google Maps API calculates meters? Is there some constant coefficient between meters and coordinates, used consequently? Or maybe this is a bug and in all other cases one meter in Google Maps equals one meter in reality?

Answer 1

所以，正如我在评论中所说，问题在于我对地图北边的误解。在测量方面， Google Maps API可靠。这就是我的400米圆圈在真正的北极附近的样子：