How, knowing the coordinates of the site visitor and the coordinates of the offices, show the nearest office to him?

Question

PHP

We have geographic coordinates of the site visitor, coordinates of offices. It is necessary to determine the office closest to the visitor. Need a formula for calculating distances by coordinates, preferably in JS

Answer 1

Нашел решение:
var radLat1 = 55 * (Math.PI/180);
var radLon1 = 37 * (Math.PI/180);
var radLat2 = 59 * (Math.PI/180);
var radLon2 = 30 * (Math.PI/180);
var earthRadius = 6372.795;
var radLonDif = radLon2 - radLon1;
var atan2top = Math.sqrt( Math.pow( Math.cos(radLat2) * Math.sin(radLonDif), 2 ) + Math.pow( Math.cos(radLat1)*Math.sin(radLat2) - Math.sin(radLat1) * Math.cos(radLat2) * Math.cos(radLonDif), 2 ) );
var atan2bottom = Math.sin(radLat1)*Math.sin(radLat2)+Math.cos(radLat1)*Math.cos(radLat2)*Math.cos(radLonDif);
var deltaAngle = Math.atan2(atan2top, atan2bottom);
console.log(earthRadius*deltaAngle); /* 614*/

Answer 2

наймите разработчика,или вы ожидаете что вам напишут рабочий скрипт здесь?

Answer 3

формула для расчета расcтояний