经纬度坐标转换为距离及角度(Python)

2020/11/01 11:35
阅读数 360

最近项目上有这样的需求,需要依据设备的经纬度坐标计算距离及角度。经验证后效果较好,并分享。

1 经纬度转换距离代码

#!/usr/bin/env python
# -*- coding: utf-8 -*-
__author__ = 'Seven'


import math


# 计算距离
def getDistance(latA, lonA, latB, lonB):
    ra = 6378140  # 赤道半径
    rb = 6356755  # 极半径
    flatten = (ra - rb) / ra  # Partial rate of the earth
    # change angle to radians
    radLatA = math.radians(latA)
    radLonA = math.radians(lonA)
    radLatB = math.radians(latB)
    radLonB = math.radians(lonB)

    pA = math.atan(rb / ra * math.tan(radLatA))
    pB = math.atan(rb / ra * math.tan(radLatB))
    x = math.acos(math.sin(pA) * math.sin(pB) + math.cos(pA) * math.cos(pB) * math.cos(radLonA - radLonB))
    c1 = (math.sin(x) - x) * (math.sin(pA) + math.sin(pB)) ** 2 / math.cos(x / 2) ** 2
    c2 = (math.sin(x) + x) * (math.sin(pA) - math.sin(pB)) ** 2 / math.sin(x / 2) ** 2
    dr = flatten / 8 * (c1 - c2)
    distance = ra * (x + dr)
    distance = round(distance / 1000, 4)
    return f'{distance}km'

2 经纬度转化角度代码

#!/usr/bin/env python
# -*- coding: utf-8 -*-
__author__ = 'Seven'

import math

# 计算角度
def getDegree(latA, lonA, latB, lonB):
    radLatA = math.radians(latA)
    radLonA = math.radians(lonA)
    radLatB = math.radians(latB)
    radLonB = math.radians(lonB)
    dLon = radLonB - radLonA
    y = math.sin(dLon) * math.cos(radLatB)
    x = math.cos(radLatA) * math.sin(radLatB) - math.sin(radLatA) * math.cos(radLatB) * math.cos(dLon)
    brng = math.degrees(math.atan2(y, x))
    brng = round((brng + 360) % 360, 4)
    brng = int(brng)
    if (brng == 0.0) or ((brng == 360.0)):
        return '正北方向'
    elif brng == 90.0:
        return '正东方向'
    elif brng == 180.0:
        return '正南方向'
    elif brng == 270.0:
        return '正西方向'
    elif 0 < brng < 90:
        return f'北偏东{brng}'
    elif 90 < brng < 180:
        return f'东偏南{brng - 90}'
    elif 180 < brng < 270:
        return f'西偏南{270 - brng}'
    elif 270 < brng < 360:
        return f'北偏西{brng - 270}'
    else:
        pass

3 验证

选取深圳野生动物园(22.599578, 113.973129)为起点,深圳坪山站(22.6986848, 114.3311032)为终点,结合百度地图、谷歌地图等进行效果验证。

程序运行结果如下:

百度测距为38.3km

Google地图手动测距为39.31km

 

距离与角度均无问题。 

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