Calculate distance between two geocooridnates

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Here is a javascript function to calculate the distance between two latitude and longitude coordinates.

function deg2rad(deg) { return deg * (Math.PI/180) }
function calcDistance(lat1,lon1,lat2,lon2) {
  var R = 6371; // Radius of the earth in km
  var dLat = deg2rad(lat2-lat1);
  var dLon = deg2rad(lon2-lon1);
  var 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)
    ;
  var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
  var d = R * c; // Distance in km
  return d;
}

To use the function just:

distance = calcDistance(latitude1,longitude1,latitude2,longitude2);

geo-coordinates

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