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/* Author: Farrukh Shahzad */
// This function was originally written by R.V. as
// shown on the algorithm section of code gallery (http://www.zend.com/codex.php?
id=32&single=1).
// I tried that function and found that it is not given the same answer (I dont know whether
Raplh's math is right)
// as given by my function shown below.
//Also It is much simpler math and gives direction of 2nd point with respect first
function calcMiles($lat1, $lon1, $lat2, $lon2) {
$deg2mile = 69.09; //for earth
$temp1 = cos(deg2rad($lat1));
$temp2 = cos(deg2rad($lat2));
$dist = sqrt( $temp1 * $temp2 * pow($lon1 - $lon2 , 2) + pow($lat1 - $lat2, 2) );
$miles = $dist * $deg2mile;
if ($lat2 == $lat1){
if ($lon2 == $lon1)
$dirstr="";
else {
if($lon2 > $lon1)
$dirstr = "East";
else
$dirstr = "West";
}
}else if($lat2 < $lat1){
if($lon2 == $lon1)
$dirstr="North";
else {
if($lon2 > $lon1)
$dirstr="NorthEast";
else
$dirstr="NorthWest";
}
}else if ($lat2 > $lat1){
if($lon2 == $lon1)
$dirstr="South";
else {
if($lon2 > $lon1)
$dirstr="SouthEast";
else $dirstr="SouthWest";
}
}
$miles = sprintf("%0.2f miles %s",$miles,$dirstr);
return $miles;
} |
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