27 lines
702 B
JavaScript
27 lines
702 B
JavaScript
function getDistance(lat1, lon1, lat2, lon2) {
|
|
// pastikan semuanya number
|
|
lat1 = parseFloat(lat1);
|
|
lon1 = parseFloat(lon1);
|
|
lat2 = parseFloat(lat2);
|
|
lon2 = parseFloat(lon2);
|
|
|
|
const R = 6371000; // radius bumi dalam meter
|
|
const toRad = Math.PI / 180;
|
|
|
|
const dLat = (lat2 - lat1) * toRad;
|
|
const dLon = (lon2 - lon1) * toRad;
|
|
|
|
const 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);
|
|
|
|
const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
|
|
const distance = R * c;
|
|
|
|
return distance;
|
|
}
|
|
|
|
module.exports = { getDistance };
|
|
|