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Get distance from latitude and longitude in kilometers
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// @credit http://stackoverflow.com/questions/27928/how-do-i-calculate-distance-between-two-latitude-longitude-points | |
function getDistanceFromLatLonInKm(lat1,lon1,lat2,lon2) { | |
var R = 6371; // Radius of the earth in km | |
var dLat = deg2rad(lat2-lat1); | |
var dLon = deg2rad(lon2-lon1); | |
var a = | |
Math.sin(dLat/2) * Math.sin(dLat/2) + | |
Math.cos(deg2rad(lat1)) * Math.cos(deg2rad(lat2)) * | |
Math.sin(dLon/2) * Math.sin(dLon/2) | |
; | |
var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a)); | |
var d = R * c; // Distance in km | |
return d; | |
} | |
function deg2rad(deg) { | |
return deg * (Math.PI/180) | |
} |
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