ginfo.py 文件源码

def unproject(x, y):
        """
          Converts a x/y point to a lat/lng coordinate
        """
        d = 180.0 / math.pi
        return (
            (2.0 * math.atan(math.exp(y / SphericalMercator.R)) - (math.pi / 2.0)) * d,
            x * d / SphericalMercator.R
        )