private readonly EARTH_RADIUS = 6372.795477598;

  isNearLocation(latitude1: number, longitude1: number, latitude2: number, longitude2: number, km = 0.1) {
    const latitude1radiant = Math.PI * latitude1 / 180;
    const longitude1radiant = Math.PI * longitude1 / 180;
    const latitude2radiant = Math.PI * latitude2 / 180;
    const longitude2radiant = Math.PI * longitude2 / 180;
    const distance = this.EARTH_RADIUS
      * Math.acos((Math.sin(latitude1radiant) * Math.sin(latitude2radiant)) + (Math.cos(latitude1radiant)
        * Math.cos(latitude2radiant) * Math.cos(Math.abs((longitude1radiant) - (longitude2radiant)))));
    if (distance > km) {
      return false;
    } else {
      return true;
    }
  }