Returns the distance in meter between 2 GPS coordinates

getDistanceFromGPS.js

/**
 * Returns the distance in meter between 2 GPS coordinates
 * @param {number} lat1 - Latitude of the first coordinate
 * @param {number} lon1 - Longitude of the first coordinate
 * @param {number} lat2 - Latitude of the second coordinate
 * @param {number} lon2 - Longitude of the second coordinate
 * @returns {number} The distance in meter (float)
 */
function getDistanceFromGPS(lat1, lon1, lat2, lon2) {
  if (
    parseFloat(lat1) !== lat1 ||
    parseFloat(lon1) !== lon1 ||
    parseFloat(lat2) !== lat2 ||
    parseFloat(lon1) !== lon1
  ) {
    throw "Error params. Only float value accepted."
  }

  if (lat1 < 0 || lat1 > 90 || lat2 < 0 || lat2 > 90) {
    throw `Out of range value. lat1 and lat2 must be 0< ? <90. Given values are lat1=${lat1} and lat2=${lat2}`
  }

  if (lon1 < -180 || lon1 > 180 || lon2 < -180 || lon2 > 180) {
    throw `Out of range value. lon1 and lon2 must be -180< ? <180. Given values are lon1=${lon1} and lon2=${lon2}`
  }

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

  const t1 = Math.sin(degreesToRadians(lat1)) * Math.sin(degreesToRadians(lat2))
  const t2 = Math.cos(degreesToRadians(lat1)) * Math.cos(degreesToRadians(lat2))
  const t3 = Math.cos(degreesToRadians(lon1) - degreesToRadians(lon2))
  const t4 = t2 * t3
  const t5 = t1 + t4

  const rad_dist = Math.atan(-t5 / Math.sqrt(-t5 * t5 + 1)) + 2 * Math.atan(1)

  return rad_dist * 3437.74677 * 1.1508 * 1.6093470878864446 * 1000
}