RE: [PHP] longitude/latitude function

[Edward Peloke]

Thanks Aaron,

If you don't mind me asking, where did you get it?  It seems to give a
better answer than my function.

Thanks!
Eddie

-----Original Message-----
From: Aaron Gould [mailto:webdevel@;partscanada.com]
Sent: Friday, November 15, 2002 11:04 AM
To: Edward Peloke; [EMAIL PROTECTED]
Subject: Re: [PHP] longitude/latitude function


Try this snippet... I can't vouch for its accuracy since I am not a
mathematician:

<?
// Function takes latitude and longitude  of two places as input
// and prints the distance in miles and kms.
function calculateDistance($lat1, $lon1, $lat2, $lon2)
    // Convert all the degrees to radians
    $lat1 = deg2rad($lat1);
    $lon1 = deg2rad($lon1);
    $lat2 = deg2rad($lat2);
    $lon2 = deg2rad($lon2);

    // Find the deltas
    $delta_lat = $lat2 - $lat1;
    $delta_lon = $lon2 - $lon1;

    // Find the Great Circle distance
    $temp = pow(sin($delta_lat / 2.0), 2) + cos($lat1) * cos($lat2) *
pow(sin($delta_lon / 2.0), 2);

    $EARTH_RADIUS = 3956;

    $distance = ($EARTH_RADIUS * 2 * atan2(sqrt($temp), sqrt(1 - $temp)) *
1.6093);

    return $distance;
}
?>


--
Aaron Gould
[EMAIL PROTECTED]
Web Developer
Parts Canada


----- Original Message -----
From: "Edward Peloke" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, November 15, 2002 11:20 AM
Subject: [PHP] longitude/latitude function


> Has anyone ever written a php function to take the longitude and latitude
of
> two destinations and calculate the distance?
>
> I am working on one but the output is just a little off.
>
> Thanks,
> Eddie
>
>
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