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When working with locations in JavaScript, you often have two sets of latitude/longitude coordinates and you need the distance between theme. The following function will give you an approximate distance between theme (in miles by default).
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| /** | |
| * Calculate approximate distance between two coordinates on Earth. | |
| * | |
| * @see https://salferrarello.com/javascript-distance-between-locations | |
| * | |
| * Example: | |
| * | |
| * LatLngDist( 40.3215666, -75.9828464, 33.5417647, -112.169801 ) | |
| * | |
| * Result: | |
| * 2036 miles (or 3277 km) | |
| * @see https://stackoverflow.com/questions/21279559/geolocation-closest-locationlat-long-from-my-position. | |
| */ | |
| function LatLngDist( lat1, lng1, lat2, lng2 ) { | |
| // Convert Degress to Radians | |
| function Deg2Rad(deg) { | |
| return deg * Math.PI / 180; | |
| } | |
| function PythagorasEquirectangular(lat1, lon1, lat2, lon2) { | |
| lat1 = Deg2Rad(lat1); | |
| lat2 = Deg2Rad(lat2); | |
| lon1 = Deg2Rad(lon1); | |
| lon2 = Deg2Rad(lon2); | |
| // var R = 6371; // km | |
| var R = 3959; // miles | |
| var x = (lon2 - lon1) * Math.cos((lat1 + lat2) / 2); | |
| var y = (lat2 - lat1); | |
| var d = Math.sqrt(x * x + y * y) * R; | |
| return d; | |
| } | |
| return PythagorasEquirectangular( lat1, lng1, lat2, lng2 ); | |
| } |
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