Here is a function that I use to calculate the distance between two
points... I do not recall exactly where I found it
function CalculateDistance($lat1, $lon1, $lat2, $lon2){
$R = 6371; // km
$dLat = deg2rad($lat2-$lat1);
$dLon = deg2rad($lon2-$lon1);
$a = sin($dLat/2) * sin($dLat/2) +
cos(deg2rad($lat1)) * cos(deg2rad($lat2)) *
sin($dLon/2) * sin($dLon/2);
$c = 2 * atan2(sqrt($a), sqrt(1-$a));
$d = $R * $c;
return $d;
}
NB... distances are in km not miles.
Hope this helps,
Al
On Mon, Sep 29, 2008 at 11:52 AM, Mike Williams
<[EMAIL PROTECTED]> wrote:
>
> First obtain the lat/lng coordinates of the locations if you don't have
> them already.
>
> Then search for "Haversine formula" plus whatever language you are
> using. There are implementations of the Haversine formula in many
> different computer languages.
>
> --
> http://econym.org.uk/gmap
> The Blackpool Community Church Javascript Team
>
>
> >
>
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