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# vananth22/HaversineDistance.java

Created July 28, 2016 04:46
Java Implementation of Haversine Formula for distance calculation between two points
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 /** * This is the implementation Haversine Distance Algorithm between two places * @author ananth * R = earth’s radius (mean radius = 6,371km) Δlat = lat2− lat1 Δlong = long2− long1 a = sin²(Δlat/2) + cos(lat1).cos(lat2).sin²(Δlong/2) c = 2.atan2(√a, √(1−a)) d = R.c * */ public class HaversineDistance { /** * @param args * arg 1- latitude 1 * arg 2 — latitude 2 * arg 3 — longitude 1 * arg 4 — longitude 2 */ public static void main(String[] args) { // TODO Auto-generated method stub final int R = 6371; // Radious of the earth Double lat1 = Double.parseDouble(args[0]); Double lon1 = Double.parseDouble(args[1]); Double lat2 = Double.parseDouble(args[2]); Double lon2 = Double.parseDouble(args[3]); Double latDistance = toRad(lat2-lat1); Double lonDistance = toRad(lon2-lon1); Double a = Math.sin(latDistance / 2) * Math.sin(latDistance / 2) + Math.cos(toRad(lat1)) * Math.cos(toRad(lat2)) * Math.sin(lonDistance / 2) * Math.sin(lonDistance / 2); Double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a)); Double distance = R * c; System.out.println(“The distance between two lat and long is::” + distance); } private static Double toRad(Double value) { return value * Math.PI / 180; } }

thank u

### matteobucci commented May 12, 2019

Is this distance in kilometers?

### bergerbo commented Sep 17, 2019

Is this distance in kilometers?

Yes, the unit is set by
`final int R = 6371; // Radious of the earth`
which expresses the radius in Km

### andreagiassi commented Jun 1, 2020 • edited

I suggest to set a more precise Earth's radius value:

`public static final double R = 6371.0088; // Earth's radius Km`

Fore more reference:
`System.out.println("The distance between two lat and long is: " + distance);`
FYI there is a `Math.toRadians()` method