Get the center of two or more geo coordinates

get-geo-center.ts

function getGeoCenter(data) {
  const coordLength = data.length;

  let x = 0;
  let y = 0;
  let z = 0;

  for (const item of data) {
    const lat = item.lat * Math.PI / 180;
    const lon = item.lng * Math.PI / 180;

    x += Math.cos(lat) * Math.cos(lon);
    y += Math.cos(lat) * Math.sin(lon);
    z += Math.sin(lat);
  }

  x /= coordLength;
  y /= coordLength;
  z /= coordLength;

  const lonResult = Math.atan2(y, x);
  const hyp = Math.sqrt(x * x + y * y);
  const latResult = Math.atan2(z, hyp);

  return {
    lat: (latResult * 180 / Math.PI),
    lng: (lonResult * 180 / Math.PI),
  };
}