Travel Distance between two Lat and Long

Question

I am looking to calculate and give the distance between two sets of Lat and Long for travel on Road.

I have had a look at the Google\'s Directions and Distance Matrix A

Answer 1

You might want to search a little more before you ask.

Anyways, use the Haversine formula

rad = function(x) {return x*Math.PI/180;}

distHaversine = function(p1, p2) {
  var R = 6371; // earth's mean radius in km
  var dLat  = rad(p2.lat() - p1.lat());
  var dLong = rad(p2.lng() - p1.lng());

  var a = Math.sin(dLat/2) * Math.sin(dLat/2) +
          Math.cos(rad(p1.lat())) * Math.cos(rad(p2.lat())) * Math.sin(dLong/2) * Math.sin(dLong/2);
  var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
  var dist = R * c;

  return dist.toFixed(3);
}