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Get Distance From Latitude and Longitude in Kilometers
function getDistanceFromLatLonInKm(lat1, lon1, lat2, lon2) {
var R = 6371, // Radius of the earth in km
dLat = deg2rad(lat2 - lat1), // deg2rad below
dLon = deg2rad(lon2 - lon1),
a = Math.sin(dLat / 2) * Math.sin(dLat / 2) +
Math.cos(deg2rad(lat1)) * Math.cos(deg2rad(lat2)) *
Math.sin(dLon / 2) * Math.sin(dLon / 2),
c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a)),
d = R * c; // Distance in km
return d;
}
function deg2rad(deg) {
return deg * (Math.PI / 180);
}
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