Untitled

PHP and GPS Coordinates, getting the total distance along paths made up of several points

$coordinates = "-82.36554110283872,26.15200821551467,0 -82.420692,26.097404,0 -82.52855700000001,26.186567,0 -82.41250599999999,25.996422,0 -82.50644510379755,26.05431354409091,0"

       

function coordDistance($lat1, $lon1, $lat2, $lon2) {

$delta_lat = $lat2 - $lat1;

$delta_lon = $lon2 - $lon1;

 

$earth_radius = 20908800.00; //Distance around the earth in feet

 

$alpha  = $delta_lat/2;

$beta   = $delta_lon/2;

$a          = sin(deg2rad($alpha)) * sin(deg2rad($alpha)) + cos(deg2rad($lat1)) *    cos(deg2rad($lat2)) * sin(deg2rad($beta)) * sin(deg2rad($beta)) ;

$c      = asin(min(1, sqrt($a)));

$distance = 2*$earth_radius * $c;

$distance = round($distance, 4);

 

return $distance;

}

       

$total = 0;

 

$points = explode(' ', $coordinates);

$count = count($points);

 

for ($i = 0; $count - 1 > $i; ++$i) {

    list($lon1, $lat1, $alt1) = explode(',', $points[$i]);

    list($lon2, $lat2, $alt2) = explode(',', $points[$i + 1]);

 

    $total += coordDistance($lat1, $lon1, $lat2, $lon2);

}

       

$coordinatesArray = explode(" ", $coordinates);

       

coordDistance($coordinatesArray[i], $coordinatesArray[i+1],); // in a loop

       

$coordinateA = explode(",", $coordinatesArray[i]); // again, in a loop

$coordinateB = explode(",", $coordinatesArray[i+1]);

 

coordDistance($coordinateA[0], $coordinateB[0], $coordinateA[1], $coordinateB[1])