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September 24, 2018 21:29
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calc gps distance
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| def calc_distance(lat1, lng1, lat2, lng2): | |
| """ 城市内距离计算函数，这里是简化了 Haversine 公式，单位是米 | |
| 在一个城市的范围内，可以近似认为经线和纬线是垂直的 | |
| """ | |
| dx = lng1 - lng2 # 经度差值 | |
| dy = lat1 - lat2 # 纬度差值 | |
| b = (lat1 + lat2) / 2.0 # 平均纬度 | |
| lx = math.radians(dx) * 6367000.0 * math.cos(math.radians(b)) # 东西距离 | |
| ly = 6367000.0 * math.radians(dy) # 南北距离 | |
| return math.sqrt(lx * lx + ly * ly) # 用平面的矩形对角距离公式计算总距离 | |
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