Question

141

Google Maps V3 distance between two points - different values

rated 0 times [ 144] [ 3] / answers: 1 / hits: 17637 / 8 Years ago, tue, november 1, 2016, 12:00:00

I tried to find a better way to calculate distance between two points on google maps, but the result it wasn't what I expected.

For example, those two solutions which I found here: Calculate distance between two points in google maps V3 are similarly (it produces aprox. 249.3424456 Km - but its wrong because distance between Bacau and Bucharest - Romania - are aprox. 300 Km).

The plnkr link: http://plnkr.co/edit/cv25C6pga0lla7xyBDRO?p=preview

Or:

$( document ).ready(function() {

var myLatLng = new google.maps.LatLng({ lat: 46.5610058, lng: 26.9098054 });

var myLatLng2 = new google.maps.LatLng({ lat: 44.391403, lng: 26.1157184 });

var calc1 = google.maps.geometry.spherical.computeDistanceBetween(myLatLng, myLatLng2)/1000;

console.log('calc1 = ' + calc1);



var start = { lat: 46.5610058, lng: 26.9098054 };

var stop = { lat: 44.391403, lng: 26.1157184 };



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

};

var calc2 = getDistance(start, stop)/1000;

console.log('calc2 = ' + calc2);





document.getElementById(test).innerHTML = 'calc1 = ' + calc1 + '<br/>calc2 = ' + calc2;

});

When I try to calculate these distance with google maps web api http://maps.googleapis.com/maps/api/distancematrix/json?origins=46.5610058,26.9098054&destinations=44.391403,26.1157184 it tell me that the distance is 299 Km (which is the good value - distance between Bacau and Bucharest - Romania - are aprox. 300 Km).

I prefer to calculate locally rather than to access every time a website but why when I use 'google.maps.geometry.spherical.computeDistanceBetween' function or Haversine formula it calculate a wrong value?

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katianatasham

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answered 8 Years ago isaac · Accepted Answer

The solution is to compute locally using distancematrix api: https://developers.google.com/maps/documentation/javascript/distancematrix (Have to enable Distance Matrix from API Dashboard)

var from = new google.maps.LatLng(46.5610058, 26.9098054);

var fromName = 'Bacau';

var dest = new google.maps.LatLng(44.391403, 26.1157184);

var destName = 'Bucuresti';



var service = new google.maps.DistanceMatrixService();

service.getDistanceMatrix(

    {

        origins: [from, fromName],

        destinations: [destName, dest],

        travelMode: 'DRIVING'

    }, callback);



function callback(response, status) {

    if (status == 'OK') {

        var origins = response.originAddresses;

        var destinations = response.destinationAddresses;



        for (var i = 0; i < origins.length; i++) {

            var results = response.rows[i].elements;

            console.log(results);

            for (var j = 0; j < results.length; j++) {

                var element = results[j];

                var distance = element.distance.text;

                var duration = element.duration.text;

                var from = origins[i];

                var to = destinations[j];

            }

        }

    }

}