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18 lines
532 B
18 lines
532 B
package tool
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import "math"
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const earthRadiusM = 6371000.0
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// Haversine 计算两个经纬度坐标之间的球面距离（单位：米）
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func Haversine(lat1, lon1, lat2, lon2 float64) float64 {
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phi1 := lat1 * math.Pi / 180
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phi2 := lat2 * math.Pi / 180
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dPhi := (lat2 - lat1) * math.Pi / 180
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dLambda := (lon2 - lon1) * math.Pi / 180
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a := math.Sin(dPhi/2)*math.Sin(dPhi/2) +
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math.Cos(phi1)*math.Cos(phi2)*math.Sin(dLambda/2)*math.Sin(dLambda/2)
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c := 2 * math.Atan2(math.Sqrt(a), math.Sqrt(1-a))
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return earthRadiusM * c
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}
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