Convert Latitude and Longitude into kms

Question

I am building application where i am getting the user\'s latitude and longitude using the below code

Answer 1

This Script is usefull for you, but its in php

function distance($lat1, $lon1, $lat2, $lon2, $unit) {

      $theta = $lon1 - $lon2;
      $dist = sin(deg2rad($lat1)) * sin(deg2rad($lat2)) +  cos(deg2rad($lat1)) * cos(deg2rad($lat2)) * cos(deg2rad($theta));
       $dist = acos($dist);
       $dist = rad2deg($dist);
      $miles = $dist * 60 * 1.1515;
      $unit = strtoupper($unit);

 if ($unit == "K") {
   return ($miles * 1.609344);
     } else if ($unit == "N") {
     return ($miles * 0.8684);
      } else {
      return $miles;
     }
  }

Function to use

  echo distance(32.9697, -96.80322, 29.46786, -98.53506, "M") . " Miles
";
  echo distance(32.9697, -96.80322, 29.46786, -98.53506, "K") . " Kilometers
";
  echo distance(32.9697, -96.80322, 29.46786, -98.53506, "N") . " Nautical Miles
";