[ php ] 위도 경도로 직선거리 계산하기 > php

 <?php

/**

* Calculates the great-circle distance between two points, with

* the Haversine formula.

* @param float $latitudeFrom Latitude of start point in [deg decimal]

* @param float $longitudeFrom Longitude of start point in [deg decimal]

* @param float $latitudeTo Latitude of target point in [deg decimal]

* @param float $longitudeTo Longitude of target point in [deg decimal]

* @param float $earthRadius Mean earth radius in [m]

* @return float Distance between points in [m] (same as earthRadius)

**/

function haversineGreatCircleDistance( $latitudeFrom, $longitudeFrom, $latitudeTo, $longitudeTo, $earthRadius = 6371000)

{

    // convert from degrees to radians

    $latFrom = deg2rad($latitudeFrom);

    $lonFrom = deg2rad($longitudeFrom);

    $latTo = deg2rad($latitudeTo);

    $lonTo = deg2rad($longitudeTo);

    

    $latDelta = $latTo - $latFrom;

    $lonDelta = $lonTo - $lonFrom;

    

    $angle = 2 * asin(sqrt(pow(sin($latDelta / 2), 2) + cos($latFrom) * cos($latTo) * pow(sin($lonDelta / 2), 2)));

    return $angle * $earthRadius;

}

 

$center_lat = 41.8350;

$center_lng = 12.470;

$lat = 41.9133741000;

$lng = 12.5203944000;

 

// test with your arccosine formula

$distance =( 6371 * acos((cos(deg2rad($center_lat)) ) * (cos(deg2rad($lat))) * (cos(deg2rad($lng) - deg2rad($center_lng)) )+ ((sin(deg2rad($center_lat))) * (sin(deg2rad($lat))))) );

print($distance); // prints 9.662174538188

// test with my haversine formula

$distance = haversineGreatCircleDistance($center_lat, $center_lng, $lat, $lng, 6371);

print($distance); // prints 9.6621745381693

?>