gcd

README

Greater Circle Distance Calculation

Description

4air needs a fast calculator module that multiple projects can use. The calculator will be used to calculate the distance between two points on the Earth's surface. The distance is calculated using the Great Circle Distance formula. The formula is as follows:

Haversine Formula

d = rcos-1[cos a cos b cos(x-y) + sin a sin b]

Vincenty Formula

a = sin²(Δφ/2) + cos φ1 ⋅ cos φ2 ⋅ sin²(Δλ/2)
c = 2 ⋅ atan2( √a, √(1−a) )
d = R ⋅ c

Version 0.2.0

Documentation

Index

• Constants
• func Haversine(lat1, long1, lat2, long2 float64) (float64, error)
• func Vincenty(lat1, long1, lat2, long2 float64) (float64, error)

Constants

const EARTH_RADIUS float64 = 6371

Functions

func Haversine

func Haversine(lat1, long1, lat2, long2 float64) (float64, error)

func Vincenty

func Vincenty(lat1, long1, lat2, long2 float64) (float64, error)