var phi = (90 - latitude) * Math.PI / 180;
  var theta = (180 - longitude) * Math.PI / 180;

  var point = new THREE.Vector3(
    EARTH_RADIUS * Math.sin(phi) * Math.cos(theta),
    EARTH_RADIUS * Math.cos(phi),
    EARTH_RADIUS * Math.sin(phi) * Math.sin(theta)
  )