I've found a good answer for you! :-D
http://bit.ly/11SaJ04
Or
$southwest_lat = $_GET['swlat'];
$southwest_lng = $_GET['swlng'];
$northeast_lat = $_GET['nelat'];
$northeast_lng = $_GET['nelng'];
$result = distance($southwest_lat, $southwest_lng, $northeast_lat,
$northeast_lng, "K");
if($result > 20) {
echo "over 20!";
} else {
echo "over 20!";
}
function distance($lat1, $lon1, $lat2, $lon2, $unit) {
$theta = $lon1 - $lon2;
$dist = sin(deg2rad($lat1)) * sin(deg2rad($lat2)) +
cos(deg2rad($lat1)) * cos(deg2rad($lat2)) * cos(deg2rad($theta));
$dist = acos($dist);
$dist = rad2deg($dist);
$miles = $dist * 60 * 1.1515;
$unit = strtoupper($unit);
if ($unit == "K") {
return ($miles * 1.609344);
} else if ($unit == "N") {
return ($miles * 0.8684);
} else {
return $miles;
}
}
On Tue, Apr 30, 2013 at 4:30 PM, Olivia <[email protected]> wrote:
> Hi all,
>
> I am using PHP 5.3.9 and I am trying to figure out how to calculate the
> size of a bounding box based on the passed in coordinates of the 4 corners
> of a geographical map.
> The reason for this is that I need to check that the size/area of the
> bounding box is not larger than 20 Kilometres.
>
> The bounding box format is defined as:
>
> $southwest_lat = $_GET['swlat'];
> $southwest_lng = $_GET['swlng'];
> $northeast_lat = $_GET['nelat'];
> $northeast_lng = $_GET['nelng'];
>
> Your help is much appreciated.
>
> Kind regards,
> Olivia
>
>
>
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