¿Cómo calcular la distancia entre dos puntos en Google Maps con JavaScript?

Para medir la distancia entre dos puntos se utiliza una fórmula de distancia que deriva del teorema de Pitágoras. Para encontrar la distancia entre dos puntos (x1, y1) y (x2, y2), lo que requiere son las coordenadas de los dos puntos y aplicar la fórmula que se muestra a continuación.

Formula para obtener la distancia entre dos coordenadas de google maps. A continuación tienes el código del ejemplo


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Calculate distance between two latitude longitude points google maps api</title>
    <script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?key=AIzaSyBLMa7emvhGQMK0uYYrS-9aymoEhlX-4sU"></script>
    <script src="jquery-1.7.2.js" type="text/javascript"></script>
    <script type="text/javascript" src="utility.js"></script>

    <style type="text/css">
        html, body, #map-canvas {
            margin: 0;
            padding: 0;
            height: 350px;
            width: auto;
        }
    </style>


    <script type="text/javascript">
        var map;
        var infoHandler;
        var DistanceBearingPolyline;
        var isDistanceFlag = false;
        var DistBearingPolylineClickHdl = 0;
        var DistBearingMapClickHdl = 0;
        var InfoWindowCloseClickHdl = 0;

        function initialize() {
            var mapOptions = {
                zoom: 11,                                    // Set Zoom Level
                center: new google.maps.LatLng(19.39812458609908, -99.1100109147653),     // Set the Latitude and longitude of the location
                mapTypeId: google.maps.MapTypeId.ROADMAP    // Set Map Type Here ROADMAP, TERRAIN, SATELLITE
            };


            map = new google.maps.Map(document.getElementById('map-canvas'),      // Creating the map object to desplay
                mapOptions);

            /*Global mousemove event, developer has to manage the event while coding to use flags for different functionalities*/
            google.maps.event.addListener(map, 'mousemove', function (event) {
                // $('#divCoords').html(roundNumber(event.latLng.lat(), 5) + "," + roundNumber(event.latLng.lng(), 5));
                if (isDistanceFlag) {
                    if (DistanceBearingPolyline != null) {
                        var path = DistanceBearingPolyline.getPath();
                        var len = path.getLength();
                        $('#divLength').html("<span>Length: " + DistanceBearingPolyline.inKm() + " km</span>");
                        if (len == 1) {
                            path.push(event.latLng);
                        } else {
                            path.setAt(len - 1, event.latLng);
                        }
                    }
                }
            });
        }
    </script>

</head>
<body onload="initialize();">
    <form id="form1" runat="server">
        <h1>Google maps distance from location to location</h1>
        <a href="#" onclick="MeasureDistance();" style="font-family: Verdana; font-size: 14px;">Click here to measure distance</a>
        <br />
        <br />

        <div id="divLength">
            <span style="font-family: Verdana; font-size: 14px; color: red"><b>Distance: 0 km</b></span>
        </div>
        <br />

        <div id="map-canvas">
        </div>
    </form>
</body>
</html>

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