| public greatCircle ( ) : double | ||
| return | double | The distance in meters |
public function greatCircle()
{
Ellipsoid::checkCoordinatesEllipsoid($this->from, $this->to);
$latA = deg2rad($this->from->getLatitude());
$lngA = deg2rad($this->from->getLongitude());
$latB = deg2rad($this->to->getLatitude());
$lngB = deg2rad($this->to->getLongitude());
$degrees = acos(sin($latA) * sin($latB) + cos($latA) * cos($latB) * cos($lngB - $lngA));
return $this->convertToUserUnit($degrees * $this->from->getEllipsoid()->getA());
}