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Calculate the distance between 2 points on Google Maps
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function distance(lat1,lon1,lat2,lon2) { | |
var R = 6371; // km (change this constant to get miles) | |
var dLat = (lat2-lat1) * Math.PI / 180; | |
var dLon = (lon2-lon1) * Math.PI / 180; | |
var a = Math.sin(dLat/2) * Math.sin(dLat/2) + | |
Math.cos(lat1 * Math.PI / 180 ) * Math.cos(lat2 * Math.PI / 180 ) * | |
Math.sin(dLon/2) * Math.sin(dLon/2); | |
var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a)); | |
var d = R * c; | |
if (d>1) return Math.round(d)+"km"; | |
else if (d<=1) return Math.round(d*1000)+"m"; | |
return d; | |
} |
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