41 lines
985 B
Markdown
41 lines
985 B
Markdown
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## GPS 算法Python工具
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一、距离的计算
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```python
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#--------------------------------------------------------------------------
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# Function : cal_distance
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# Descripiton : 给定经纬度, 计算两点之间距离m
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# Author : zhanli@vivo.com
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# Date : 2022-07-06
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#--------------------------------------------------------------------------
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def cal_distance(lat1,lon1,lat2,lon2):
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dis = 0
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# WGS-84椭球体长半轴
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WGS84_RE = 6378136.49
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# 第一偏向率的平方，e^2(WGS-84)
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WGS84_ECCENTR2 = 6.69437999014e-3
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# 角度转弧度系数
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DEG2RAD = 0.017453292
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lat = lat1 * DEG2RAD
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sinLat = math.sin(lat)
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p = 1 - WGS84_ECCENTR2 * (sinLat * sinLat)
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temp = math.sqrt(p)
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rmh = WGS84_RE * (1 - WGS84_ECCENTR2) / (p*temp)
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rnh = WGS84_RE * math.cos(lat) / temp
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rmh *= DEG2RAD
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rnh *= DEG2RAD
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latDiff = rmh*(lat1 - lat2)
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lonDiff = rnh*(lon1 - lon2)
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dis = math.sqrt(latDiff*latDiff + lonDiff*lonDiff)
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return dis
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```
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