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go_helpers/position/haversine.go

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2016-05-06 21:43:45 +00:00
package position
import "math"
const (
earthRadius = float64(6371)
)
func Haversine(lonFrom float64, latFrom float64, lonTo float64, latTo float64) (distance float64) {
var deltaLat = (latTo - latFrom) * (math.Pi / 180)
var deltaLon = (lonTo - lonFrom) * (math.Pi / 180)
var a = math.Sin(deltaLat/2)*math.Sin(deltaLat/2) +
math.Cos(latFrom*(math.Pi/180))*math.Cos(latTo*(math.Pi/180))*
math.Sin(deltaLon/2)*math.Sin(deltaLon/2)
var c = 2 * math.Atan2(math.Sqrt(a), math.Sqrt(1-a))
distance = earthRadius * c
return
}