Description

Different haversine formulas

Setup

``````function deg2rad(deg) {
return deg * Math.PI / 180
}``````

Test runner

Testing in
TestOps/sec
1
``````function distance(lat1, lon1, lat2, lon2) {
var R = 6371; // Radius of the earth in km
var dLon = deg2rad(lon2 - lon1);
var a =
Math.sin(dLat/2) * Math.sin(dLat/2) +
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;
}

distance(48, -122, 49, -121);``````
2
``````function distance(lat1, lon1, lat2, lon2) {
var R = 6371;
var dLat = deg2rad(lat2 - lat1);
var dLon = deg2rad(lon2 - lon1);
var a =
0.5 - Math.cos(dLat)/2 +
(1 - Math.cos(dLon))/2;

return R * 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
}

distance(48, -122, 49, -121);``````
3
``````function distance(lat1, lon1, lat2, lon2) {
var R = 6371; // Radius of the earth in km
var dLat = (lat2 - lat1) * Math.PI / 180;  // deg2rad below
var dLon = (lon2 - lon1) * Math.PI / 180;
var a =
0.5 - Math.cos(dLat)/2 +
Math.cos(lat1 * Math.PI / 180) * Math.cos(lat2 * Math.PI / 180) *
(1 - Math.cos(dLon))/2;

return R * 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
}

distance(48, -122, 49, -121);``````
4
``````function distance(lat1, lon1, lat2, lon2) {
var R = 6371; // Radius of the earth in km
var dLat = (lat2 - lat1) * Math.PI / 180;  // deg2rad below
var dLon = (lon2 - lon1) * Math.PI / 180;
var a =
0.5 - Math.cos(dLat)/2 +
Math.cos(lat1 * Math.PI / 180) * Math.cos(lat2 * Math.PI / 180) *
(1 - Math.cos(dLon))/2;

return R * 2 * Math.asin(Math.sqrt(a));
}

distance(48, -122, 49, -121);``````
5
``````function distance(lat1, lon1, lat2, lon2) {
var deg2rad = Math.PI / 180;
var diam = 12742; // Diameter of the earth in km (2 * 6371)
var dLat = lat2 - lat1;
var dLon = lon2 - lon1;
var a = (
(1 - Math.cos(dLat)) +
(1 - Math.cos(dLon)) * Math.cos(lat1) * Math.cos(lat2)
) / 2;

return diam * Math.asin(Math.sqrt(a));
}

distance(48, -122, 49, -121);``````