Compute Distance

private double distance(double lat1, double lon1, double lat2, double lon2, char unit) {
if ((lat1 == lat2) && (lon1 == lon2)) {
return 0;
}
else {
double theta = lon1 - lon2;
double dist = Math.Sin(deg2rad(lat1)) * Math.Sin(deg2rad(lat2)) + Math.Cos(deg2rad(lat1)) * Math.Cos(deg2rad(lat2)) * Math.Cos(deg2rad(theta));
dist = Math.Acos(dist);
dist = rad2deg(dist);
dist = dist * 60 * 1.1515;
if (unit == 'K') {
dist = dist * 1.609344;
} else if (unit == 'N') {
dist = dist * 0.8684;
}
return (dist);
}
}
//This function converts decimal degrees to radians
private double deg2rad(double deg) {
return (deg * Math.PI / 180.0);
}
//This function converts radians to decimal degrees
private double rad2deg(double rad) {
return (rad / Math.PI * 180.0);
}
//You can also use GeoCordinate class of .NET
var sCoord = new GeoCoordinate(sLatitude, sLongitude);
var eCoord = new GeoCoordinate(eLatitude, eLongitude);

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