Distance calculation based on multiple locations (Lat,Lon)

Codes here !

Moderators: macek, egami, gesf

Post Reply
nitapita
New php-forum User
New php-forum User
Posts: 8
Joined: Sun Jan 06, 2013 12:41 am

Distance calculation based on multiple locations (Lat,Lon)

Post by nitapita » Thu May 09, 2013 10:48 pm

0 down vote favorite


I would like to calculate the total distance of driving beetween multiple locations (loop), including the distance (starting point (garage) - first location sarting point) and (last location finishig point - finishing point (garage)). Example: (Garage + D1) + (D1 + D2) + (D2 + E1) + (E1 + E2) + E2 + Garage)

I'm having a problem with the correct looping. Here's my simplified code:

Code: Select all

<?
$driver = 5;

     $result2 = mysql_query("SELECT * FROM test WHERE id='$driver' LIMIT 1") or die(mysql_error());
     while($row2 = mysql_fetch_array( $result2 )) {
         $lon=$row2['lon'];
         $lat=$row2['lat'];
    echo "$lon, $lat";
     }

   $result = mysql_query("SELECT * FROM test1 WHERE driver='$driver'") or die(mysql_error());  
    while($row = mysql_fetch_array( $result )) {

         $lon1=$row['lon1'];
         $lat1=$row['lat1'];
         $lon2=$row['lon2'];
         $lat2=$row['lat2'];

        //////////  distance between driver address and starting address    
        $distancecalc = (3958*3.1415926*sqrt(($lat-$lat1)*($lat-$lat1) + cos($lat/57.29578)*cos($lat1/57.29578)*($lon-$lon1)*($lon-$lon1))/180);
        //////////  distance between statring address and finishing address  - multiple adsresses
        $distancecalc1 = $distancecalc1 + (3958*3.1415926*sqrt(($lat2-$lat1)*($lat2-$lat1) + cos($lat2/57.29578)*cos($lat1/57.29578)*($lon2-$lon1)*($lon2-$lon1))/180);
        //////////  distance between finishing address and driver address
        $distancecalc2 = (3958*3.1415926*sqrt(($lat2-$lat)*($lat2-$lat) + cos($lat2/57.29578)*cos($lat/57.29578)*($lon2-$lon)*($lon2-$lon))/180);

        $distancetotal = $distancecalc + $distancecalc1 +$distancecalc2;

        echo "$distancecalc<br>
        $distancecalc1<br>
        $distancecalc2<br>";
    }
    echo "$distancetotal";
  ?>
I'm aware that code posted above doesnt't do what it meant to .. i just want to keep it clear.. there is some things i tried but no correct resoults.

I would appreciate some help on this one.

Thank you very much.

nitapita
New php-forum User
New php-forum User
Posts: 8
Joined: Sun Jan 06, 2013 12:41 am

Re: Distance calculation based on multiple locations (Lat,Lo

Post by nitapita » Fri May 10, 2013 3:32 am

Ok. I worked it out with help of mac_gyver (php freaks). All calculations are done as i wish. My code below:

Code: Select all

<?
include "connectdb.php";
$driver = 5;
$datestamp = '2013/05/07';
$result2 = mysql_query("SELECT * FROM drivers WHERE id='$driver' LIMIT 1") or die(mysql_error());
while($row2 = mysql_fetch_array( $result2 )) {
$lon=$row2['lon'];
$lat=$row2['lat'];
}

$result = mysql_query("SELECT * FROM quotedb WHERE moveday='$datestamp' AND driver='$driver' AND cleared='Not Cleared' AND status='Done' ORDER BY moveday, timeday") or die(mysql_error());
$distance = 0; // accumulate the distance
$first_pass = true; // flag to detect the first row inside the loop
while($row = mysql_fetch_assoc( $result )) {
$lon2a=$lon2;
$lat2a=$lat2;
$lon1=$row['lon1'];
$lat1=$row['lat1'];
$lon2=$row['lon2'];
$lat2=$row['lat2'];
// calculate the distance from the Garage to the first point of the first row
if($first_pass){
$distance += (3958*3.1415926*sqrt(($lat-$lat1)*($lat-$lat1) + cos($lat/57.29578)*cos($lat1/57.29578)*($lon-$lon1)*($lon-$lon1))/180);
$first_pass = false;
}
// calculate the distance for each row (segment) in the route
$distance += (3958*3.1415926*sqrt(($lat2-$lat1)*($lat2-$lat1) + cos($lat2/57.29578)*cos($lat1/57.29578)*($lon2-$lon1)*($lon2-$lon1))/180);
if ( $lon2a == "" and $lat2a =="" ) {
} else {
// calculate the distance from the second point of the first row to the first point of the next row
$distance += (3958*3.1415926*sqrt(($lat2a-$lat1)*($lat2a-$lat1) + cos($lat2a/57.29578)*cos($lat1/57.29578)*($lon2a-$lon1)*($lon2a-$lon1))/180);
}
}
// calculate the distance from the second point of the last row to the Garage
$distance += (3958*3.1415926*sqrt(($lat2-$lat)*($lat2-$lat) + cos($lat2/57.29578)*cos($lat/57.29578)*($lon2-$lon)*($lon2-$lon))/180);
echo "$distance<br>
";
?> 
Still think there is a place for improvement in the code. Will aplay Haversine method for calculations. Do you guys have some suggestion to improve this piece of code ... thx

Post Reply

Who is online

Users browsing this forum: No registered users and 5 guests