/**
* Calculate the spherical distance from current coordinate to a other one.
*
* @param \Beluga\GIS\Coordinate $otherPoint
* @return integer
*/
public function calcSphericalDistanceTo(Coordinate $otherPoint)
{
if (!$this->isValid()) {
return 0;
}
$b1 = $this->Latitude->getDecimalValue();
$l1 = $this->Longitude->getDecimalValue();
$b2 = $otherPoint->Latitude->getDecimalValue();
$l2 = $otherPoint->Longitude->getDecimalValue();
$rbreite1 = $b1 * self::DEG2RAD;
$rlaenge1 = $l1 * self::DEG2RAD;
$rbreite2 = $b2 * self::DEG2RAD;
$rlaenge2 = $l2 * self::DEG2RAD;
$rwinkel = \acos(\sin($rbreite1) * \sin($rbreite2) + \cos($rbreite1) * \cos($rbreite2) * \cos(\abs($rlaenge2 - $rlaenge1)));
$entfernung = $rwinkel * 6370;
return \round($entfernung, 3);
}
