Convert Latitude and Longitude into kms

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礼貌的吻别
礼貌的吻别 2021-01-28 19:04

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

          


        
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  • 2021-01-28 19:37

    Considering that a latitude and longitude is a specific point, you cannot convert this directly to kilometers, which is a distance i.e. the length separating two points.

    But you can get the distance between two coordinates (lat+long) with a math formula. I am not really good at math, but you could find such formula with a simple search on Google: here is the first result

    You may also find something useful on this topic: How to convert latitude or longitude to meters?

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  • 2021-01-28 19:47

    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<br>";
      echo distance(32.9697, -96.80322, 29.46786, -98.53506, "K") . " Kilometers<br>";
      echo distance(32.9697, -96.80322, 29.46786, -98.53506, "N") . " Nautical Miles<br>";
    
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  • 2021-01-28 19:49

    What you're looking for is called the Haversine formula; there's a PHP implementation here.

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