protected function getPerpendicularDistance(Coordinate $point, Line $line)
{
$ellipsoid = $point->getEllipsoid();
$ellipsoidRadius = $ellipsoid->getArithmeticMeanRadius();
$firstLinePointLat = $this->deg2radLatitude($line->getPoint1()->getLat());
$firstLinePointLng = $this->deg2radLongitude($line->getPoint1()->getLng());
$firstLinePointX = $ellipsoidRadius * cos($firstLinePointLng) * sin($firstLinePointLat);
$firstLinePointY = $ellipsoidRadius * sin($firstLinePointLng) * sin($firstLinePointLat);
$firstLinePointZ = $ellipsoidRadius * cos($firstLinePointLat);
$secondLinePointLat = $this->deg2radLatitude($line->getPoint2()->getLat());
$secondLinePointLng = $this->deg2radLongitude($line->getPoint2()->getLng());
$secondLinePointX = $ellipsoidRadius * cos($secondLinePointLng) * sin($secondLinePointLat);
$secondLinePointY = $ellipsoidRadius * sin($secondLinePointLng) * sin($secondLinePointLat);
$secondLinePointZ = $ellipsoidRadius * cos($secondLinePointLat);
$pointLat = $this->deg2radLatitude($point->getLat());
$pointLng = $this->deg2radLongitude($point->getLng());
$pointX = $ellipsoidRadius * cos($pointLng) * sin($pointLat);
$pointY = $ellipsoidRadius * sin($pointLng) * sin($pointLat);
$pointZ = $ellipsoidRadius * cos($pointLat);
$normalizedX = $firstLinePointY * $secondLinePointZ - $firstLinePointZ * $secondLinePointY;
$normalizedY = $firstLinePointZ * $secondLinePointX - $firstLinePointX * $secondLinePointZ;
$normalizedZ = $firstLinePointX * $secondLinePointY - $firstLinePointY * $secondLinePointX;
$length = sqrt($normalizedX * $normalizedX + $normalizedY * $normalizedY + $normalizedZ * $normalizedZ);
if ($length == 0) {
return 0;
}
$normalizedX /= $length;
$normalizedY /= $length;
$normalizedZ /= $length;
$thetaPoint = $normalizedX * $pointX + $normalizedY * $pointY + $normalizedZ * $pointZ;
$length = sqrt($pointX * $pointX + $pointY * $pointY + $pointZ * $pointZ);
$thetaPoint /= $length;
$distance = abs(M_PI / 2 - acos($thetaPoint));
return $distance * $ellipsoidRadius;
}
