BlackForestBytes/goext
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Add GeoDistance

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This commit is contained in:
Mike Schwörer 2022-10-27 18:57:24 +02:00
parent 21ae9c70d2
commit f5243503db
Signed by: Mikescher
GPG Key ID: D3C7172E0A70F8CF
1 changed files with 10 additions and 0 deletions
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10
langext/coords.go
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@ -9,3 +9,13 @@ func DegToRad(deg float64) float64 {
func RadToDeg(rad float64) float64 { func RadToDeg(rad float64) float64 {
return rad / (math.Pi * 180.0) return rad / (math.Pi * 180.0)
} }
func GeoDistance(lon1 float64, lat1 float64, lon2 float64, lat2 float64) float64 {
var d1 = DegToRad(lat1)
var num1 = DegToRad(lon1)
var d2 = DegToRad(lat2)
var num2 = DegToRad(lon2) - num1
var d3 = math.Pow(math.Sin((d2-d1)/2.0), 2.0) + math.Cos(d1)*math.Cos(d2)*math.Pow(math.Sin(num2/2.0), 2.0)
return 6376500.0 * (2.0 * math.Atan2(math.Sqrt(d3), math.Sqrt(1.0-d3)))
}