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21 lines
535 B
Go
21 lines
535 B
Go
package position
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import "math"
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const (
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earthRadius = float64(6371)
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)
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func Haversine(lonFrom float64, latFrom float64, lonTo float64, latTo float64) (distance float64) {
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var deltaLat = (latTo - latFrom) * (math.Pi / 180)
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var deltaLon = (lonTo - lonFrom) * (math.Pi / 180)
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var a = math.Sin(deltaLat/2)*math.Sin(deltaLat/2) +
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math.Cos(latFrom*(math.Pi/180))*math.Cos(latTo*(math.Pi/180))*
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math.Sin(deltaLon/2)*math.Sin(deltaLon/2)
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var c = 2 * math.Atan2(math.Sqrt(a), math.Sqrt(1-a))
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distance = earthRadius * c
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return
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}
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