Sphärischer Abstand

Haversine formula:

R = earth’s radius (mean radius = 6,371km) Δlat = lat2− lat1 Δlong = long2− long1 a = sin²(Δlat/2) + cos(lat1).cos(lat2).sin²(Δlong/2) c = 2.atan2(√a, √(1−a)) d = R.c

(Note that angles need to be in radians to pass to trig functions). JavaScript:

var R = 6371; // km var dLat = (lat2-lat1).toRad(); var dLon = (lon2-lon1).toRad(); var a = Math.sin(dLat/2) * Math.sin(dLat/2) +

       Math.cos(lat1.toRad()) * Math.cos(lat2.toRad()) * 
       Math.sin(dLon/2) * Math.sin(dLon/2); 

var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a)); var d = R * c;