How to find distance from the latitude and longitude of two locations?

Question

I have a set of latitudes and longitudes of locations.

• How to find distance from one location in the set to another?
• Is there a f

Answer 1

here is a fiddle with finding locations / near locations to long/lat by given IP:

http://jsfiddle.net/bassta/zrgd9qc3/2/

And here is the function I use to calculate the distance in straight line:

function distance(lat1, lng1, lat2, lng2) {
        var radlat1 = Math.PI * lat1 / 180;
        var radlat2 = Math.PI * lat2 / 180;
        var radlon1 = Math.PI * lng1 / 180;
        var radlon2 = Math.PI * lng2 / 180;
        var theta = lng1 - lng2;
        var radtheta = Math.PI * theta / 180;
        var dist = Math.sin(radlat1) * Math.sin(radlat2) + Math.cos(radlat1) * Math.cos(radlat2) * Math.cos(radtheta);
        dist = Math.acos(dist);
        dist = dist * 180 / Math.PI;
        dist = dist * 60 * 1.1515;

        //Get in in kilometers
        dist = dist * 1.609344;

        return dist;
    }

It returns the distance in Kilometers