## How to calculate distance between two geographical coordinates? (C#)

Geolocation manipulations become quite often programming task. Below is a simple function that calculated distance between two coordinates in kilometers. If you prefer miles, simply multiply results by 0.6214.

public static double GetDistance(double Lat1, double Lon1, double Lat2, double Lon2)

` {`

int R = 6371;

double rLat1 = ToRadian(Lat1);

double rLat2 = ToRadian(Lat2);

double dLat = rLat2 - rLat1;

double dLon = ToRadian(Lon2 - Lon1);

double a = Math .Pow(Math .Sin(dLat / 2), 2) +

Math .Pow(Math .Sin(dLon / 2), 2) *

Math .Cos(rLat1) * Math .Cos(rLat2);

double b = 2 * Math .Atan2(Math .Sqrt(a), Math .Sqrt(1 - a));

return R * b;

` }`

public static double ToRadian(double Grad)

` {`

return Math .PI * Grad / 180;

` }`

Enjoy!

Tags : c#

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