private function positionOutput($type)
{
$pos = $this->getLandmark($type);
$res = '';
$res .= "x position: " . $pos['position']['x'] . PHP_EOL;
$res .= "y position: " . $pos['position']['y'] . PHP_EOL;
$res .= "z position: " . $pos['position']['z'] . PHP_EOL;
return $res;
}