Source Code for Me (s-c.me)

Copy Source | Copy HTML

1. function GCD1(lat1, lon1, lat2, lon2) {
2. // Return Great Circle Distance between points calculation
3.   function radians(a) {
4.     var outNum =Math.PI*a/180;
5.     return outNum;
6.   }
7.   var R = 6372.795;
8.   var d1=Math.sin(radians(lat1))*Math.sin(radians(lat2))+Math.cos(radians(lat1))*Math.cos(radians(lat2))*Math.cos(radians(lon2)-radians(lon1));
9.   var d2=Math.cos(radians(lat2))*Math.sin(radians(lon2)-radians(lon1));
10.   var d3=Math.cos(radians(lat1))*Math.sin(radians(lat2))-Math.sin(radians(lat1))*Math.cos(radians(lat2))*Math.cos(radians(lon2)-radians(lon1));
11.   var len=R*Math.atan2(Math.sqrt(d2*d2+d3*d3),d1);
12.   return len;
13. }​