Created
December 21, 2016 07:25
-
-
Save boyboi86/64b6c06d0d71b23f1761d4a64319b160 to your computer and use it in GitHub Desktop.
Calculates great-circle distances between the two points – that is, the shortest distance over the earth’s surface – using the ‘Haversine’ formula.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| function getDistanceFromLatLonInKm(lat1,lon1,lat2,lon2) { | |
| var R = 6371; // Radius of the earth in km | |
| var dLat = deg2rad(lat2-lat1); // deg2rad below | |
| 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) | |
| } |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment