Calculate distance with variable lat and lon values
Posted: Sun Jan 06, 2013 2:13 am
Hi
I have a problem with implementing variables into a function that calculate distance between 2 latitudes, longitudes.
One of the is constant, and the second one being passed from the form.
Here is the code:
As long as i have lat, lon values hardcoded is fine, but idea is to have this calculation done from variables.
Both will vary .... tried different configurations ... i'm losing it ...
How should I code it ??
Thanks for your help in advance!
I have a problem with implementing variables into a function that calculate distance between 2 latitudes, longitudes.
One of the is constant, and the second one being passed from the form.
Here is the code:
Code: Select all
$lon1 = $_POST['lon1'];
$lat1 = $_POST['lat1'];
$lon2 = '-0.30020239';
$lat2 = '51.58734910';
function distance($lat11, $lon11, $lat22, $lon22) {
$theta = $lon11 - $lon22;
$dist = sin(deg2rad($lat11)) * sin(deg2rad($lat22)) + cos(deg2rad($lat11)) * cos(deg2rad($lat22)) * cos(deg2rad($theta));
$dist = acos($dist);
$dist = rad2deg($dist);
$miles = $dist * 60 * 1.1515;
return $miles;
}
echo "
$lon1, $lat1<br>
$lon2, $lat2<br>";
////////// return good calculation
echo distance(52.611644, -0.26304, 51.58734910, -0.30020239) . " miles<br>";
////////// my way - return wrong calculation
echo distance("$lon1", "$lat1", 51.58734910, -0.30020239) . " miles<br>";Both will vary .... tried different configurations ... i'm losing it ...
How should I code it ??
Thanks for your help in advance!