How to Calculate the Distance Between Two Points on Google Maps V3?

Calculating Distance Between Points in Google Maps V3

In Google Maps V3, the distance between two markers can be calculated using the Haversine formula. This formula takes into account the Earth's curvature to provide an accurate distance measurement.

Calculating the Distance

To calculate the distance between two points using the Haversine formula, follow these steps:

1. Convert the latitudes and longitudes of the two points to radians using the rad function:

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

2. Define a function that takes two points as input and returns the distance between them in meters:

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
};

3. Call the getDistance function with the two points as arguments. The result will be the distance between the two points in meters.

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