Calculate distance between two points in google maps V3

Question

How do you calculate the distance between two markers in Google maps V3? (Similar to the distanceFrom function inV2.)

Thanks..

Answer 1

If you want to calculate it yourself, then you can use the Haversine formula:

var rad = function(x) {   return x * Math.PI / 180; };  var getDistance = function(p1, p2) {   var R = 6378137; // Earth’s mean radius in meter   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 d = R * c;   return d; // returns the distance in meter }; 

Answer 2

There actually seems to be a method in GMap3. It's a static method of the google.maps.geometry.spherical namespace.

It takes as arguments two LatLng objects and will utilize a default Earth radius of 6378137 meters, although the default radius can be overridden with a custom value if necessary.

Make sure you include:

<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false&v=3&libraries=geometry"></script> 

in your head section.

The call will be:

google.maps.geometry.spherical.computeDistanceBetween (latLngA, latLngB);