osm_stops.py 文件源码

def get_center_of_nodes(nodes):
        """Helper function to get center coordinates of a group of nodes

        """
        x = 0
        y = 0
        z = 0

        for node in nodes:
            lat = radians(float(node.lat))
            lon = radians(float(node.lon))

            x += cos(lat) * cos(lon)
            y += cos(lat) * sin(lon)
            z += sin(lat)

        x = float(x / len(nodes))
        y = float(y / len(nodes))
        z = float(z / len(nodes))

        center_lat = degrees(atan2(z, sqrt(x * x + y * y)))
        center_lon = degrees(atan2(y, x))

        return center_lat, center_lon