JavaScript Calculate Distance Between Latitude Longitude Points
JavaScript Calculate Distance Between Latitude Longitude Points : Distance between two lat lon points can be calculated using the Haversine formula. Here in this tutorial we are going to explain how you can create a function to get the distance between two lat lon points. We are going explain this with example & online demo.
JavaScript Calculate Distance Between Latitude Longitude Points Formula
You can calculate distance between the latitude and longitude using the following formula-
Method 1 – Using Haversine Formula
Haversine formula is used to calculate distance between two points using the latitue and longitude-
JavaScript Calculate Distance Between Latitude Longitude Points Example:
<script type="text/javascript">
function getDistanceFromLatLonInKm(latitude1,longitude1,latitude2,longitude2,units) {
var earthRadius = 6371; // Radius of the earth in km
var dLat = deg2rad(latitude2-latitude1); // deg2rad below
var dLon = deg2rad(longitude2-longitude1);
var a =
Math.sin(dLat/2) * Math.sin(dLat/2) +
Math.cos(deg2rad(latitude1)) * Math.cos(deg2rad(latitude2)) *
Math.sin(dLon/2) * Math.sin(dLon/2)
;
var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
var d = earthRadius * c;
var miles = d / 1.609344;
if ( units == 'km' ) {
return d;
} else {
return miles;
}
}
</script>
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The above example will give you the distance between two latitude longitude points.
Method 2
You can also use the below method to get the distance between the lat, lon points –
JavaScript Calculate Distance Between Latitude Longitude Points Example:
<script type="text/javascript">
function getDistanceFromLatLonInKm(latitude1,longitude1,latitude2,longitude2,units) {
var p = 0.017453292519943295; //This is Math.PI / 180
var c = Math.cos;
var a = 0.5 - c((latitude2 - latitude1) * p)/2 +
c(latitude1 * p) * c(latitude2 * p) *
(1 - c((longitude2 - longitude1) * p))/2;
var R = 6371; // Earth distance in km so it will return the distance in km
var dist = 2 * R * Math.asin(Math.sqrt(a));
document.getElementById("output").innerHTML = dist+"Km";
}
</script>
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The above example will give you the distance between two latitude longitude points. If you run the above example it will output something like this –
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