Golang : How to calculate the distance between two coordinates using Haversine formula
I need to develop a service that calculate the distances of my current location to several points nearby. Each of the locations are represented by coordinates and my service will pick the 3 nearest points and select one of them. So, how to calculate the distances of my current location to each and every points?
Below is a simple example using the Haversine formula to calculate the distance between 2 coordinates.
Here you go!
package main
import (
"fmt"
"math"
)
type Coordinates struct {
Latitude float64
Longitude float64
}
const radius = 6371 // Earth's mean radius in kilometers
func degrees2radians(degrees float64) float64 {
return degrees * math.Pi / 180
}
func (origin Coordinates) Distance(destination Coordinates) float64 {
degreesLat := degrees2radians(destination.Latitude - origin.Latitude)
degreesLong := degrees2radians(destination.Longitude - origin.Longitude)
a := (math.Sin(degreesLat/2)*math.Sin(degreesLat/2) +
math.Cos(degrees2radians(origin.Latitude))*
math.Cos(degrees2radians(destination.Latitude))*math.Sin(degreesLong/2)*
math.Sin(degreesLong/2))
c := 2 * math.Atan2(math.Sqrt(a), math.Sqrt(1-a))
d := radius * c
return d
}
func main() {
pointA := Coordinates{2.990353, 101.533913}
pointB := Coordinates{2.960148, 101.577888}
fmt.Println("Point A : ", pointA)
fmt.Println("Point B : ", pointB)
distance := pointA.Distance(pointB)
fmt.Printf("The distance from point A to point B is %.2f kilometers.\n", distance)
}
Sample output:
Point A : {2.990353 101.533913}
Point B : {2.960148 101.577888}
The distance from point A to point B is 5.93 kilometers.
References :
See also : Golang : Find location by IP address and display with Google Map
By Adam Ng(黃武俊)
IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.
Advertisement
Tutorials
+5.3k Android Studio : Import third-party library or package into Gradle Scripts
+3.3k Golang : Generate Interleaved 2 inch by 5 inch barcode
+4.9k Android Studio : Image button and button example
+4.5k Golang : Number guessing game with user input verification example
+5.7k How to show different content from website server when AdBlock is detected?
+3.7k Javascript : Generate random key with specific length
+2.7k Facebook : How to place save to Facebook button on your website
+11.4k Golang : Delete certain files in a directory
+6.5k Golang : How to get ECDSA curve and parameters data?
+16.1k Golang : How to count the number of repeated characters in a string?
+11.3k Golang : Fix cannot convert buffer (type *bytes.Buffer) to type string error
+33.1k Golang : Get hardware information such as disk, memory and CPU usage