/**
* very approximate calculation of the distance in kilometers between two coordinates
* @param GMapCoord $coord2
* @return float
* @author fabriceb
* @since 2009-05-03
*/
public function distanceFrom($coord2)
{
$lat_dist = abs($this->getLatitude()-$coord2->getLatitude());
$lng_dist = abs($this->getLongitude()-$coord2->getLongitude());
$rad_dist = deg2rad(sqrt(pow($lat_dist,2)+pow($lng_dist,2)));
return $rad_dist * self::EARTH_RADIUS;
}
/**
*
* @param GMapCoord $gmap_coord
* @return boolean $is_inside
* @author fabriceb
* @since Jun 2, 2009 fabriceb
*/
public function containsGMapCoord(GMapCoord $gmap_coord)
{
$is_inside =
(
$gmap_coord->getLatitude() < $this->getNorthEast()->getLatitude()
&&
$gmap_coord->getLatitude() > $this->getSouthWest()->getLatitude()
&&
$gmap_coord->getLongitude() < $this->getNorthEast()->getLongitude()
&&
$gmap_coord->getLongitude() > $this->getSouthWest()->getLongitude()
);
return $is_inside;
}
/**
* exact distance with Haversine formula
*
* @param GMapCoord $coord2
* @return float
* @see http://www.movable-type.co.uk/scripts/latlong.html
*
* @author fabriceb
* @since Apr 21, 2010
*/
public function exactDistanceFrom($coord2)
{
$lat1 = deg2rad($this->getLatitude());
$lat2 = deg2rad($coord2->getLatitude());
$lon1 = deg2rad($this->getLongitude());
$lon2 = deg2rad($coord2->getLongitude());
$dLatHalf = ($lat2 - $lat1) / 2;
$dLonHalf = ($lon2 - $lon1) / 2;
$a = pow(sin($dLatHalf), 2) + cos($lat1) * cos($lat2) * pow(sin($dLonHalf), 2);
$c = 2 * atan2(sqrt($a), sqrt(1 - $a));
return $c * self::EARTH_RADIUS;
}
