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<?php
/* assume your points, in decimal, are in $lon1,$lat1 and $lon2,$lat2
* this can also be useful with the US ZIPcodes at
* http://ftp.census.gov/geo/www/gazetteer/places.html
*/
$pi = 3.1415926;
$rad = doubleval($pi/180.0);
$lon1 = doubleval($lon1)*$rad; $lat1 = doubleval($lat1)*$rad;
$lon2 = doubleval($lon2)*$rad; $lat2 = doubleval($lat2)*$rad;
$theta = $lon2 - $lon1;
$dist = acos(sin($lat1) * sin($lat2) + cos($lat1) * cos($lat2) * cos
($theta));
if ($dist < 0) { $dist += $pi; }
$dist = $dist * 6371.2;
$miles = doubleval($dist * 0.621);
$inches = doubleval($miles*63360);
$dist = sprintf( "%.2f",$dist);
$miles = sprintf( "%.2f",$miles);
$inches = sprintf( "%.2f",$inches);
?> |
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| | | | Frederic Hecq wrote :15
Great code !
But what about metric system?
What are the values?
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