根据经纬度计算距离python脚本

根据经纬度计算距离的python代码
从某程序中copy出来的，如有侵权请联系我。

import math 
from math import sin,cos
from shapely.geometry import Point,LinearRing
EARTH_REDIUS = 6378.137
pi=3.1415926
def rad(d):
    return d * pi / 180.0

def getDistance(point1,point2):
    lat1=point1.y
    lng1=point1.x
    lat2=point2.y
    lng2=point2.x
    radLat1 = rad(lat1)
    radLat2 = rad(lat2)
    a = radLat1 - radLat2
    b = rad(lng1) - rad(lng2)
    s = 2 * math.asin(math.sqrt(math.pow(sin(a/2), 2) + cos(radLat1) * cos(radLat2) * math.pow(sin(b/2), 2)))
    s = s * EARTH_REDIUS
    return s