You are right thanks: in fact those couples repeat at each tract in some cases
even 4 times: I traced them back to the php script querying the google
service, rather than the iOS app, as you may see already at:
http://www.miafoto.it/iPhone/inarrivo/php/paletteForLineWithRoute.php?linea=50096&device=iPhone
That is the relevant php function producing that weird result being called by
the script in the url above for a sequence of origins and destinations:
function interpolate($origin, $destination){
ini_set("memory_limit","200M");
set_include_path("/iPhone/simplehtmldom_1_5");
include_once('simple_html_dom.php');
// Create DOM from URL or file
$url="http://maps.googleapis.com/maps/api/directions/xml?origin=$origin&destination=$destination&sensor=false&mode=driving";;
$html = @file_get_html($url);
echo "<path>";
$found=preg_match_all('/<points>(.*)<\/points>/sU', $html, $match);
foreach($match[1] as $polyline){
$array=decodePolylineToArray($polyline);
foreach ($array as $point){
$latitude=$point[0];
$longitude=$point[1];
//echo($latitude."|".$longitude."\r\n");
echo("<leg><legLatitude>".$latitude."</legLatitude><legLongitude>".$longitude."</legLongitude></leg>");
}
}
echo "</path>";
}
What could be the problem?
Thanks again,
Fabrizio
Il giorno 30/giu/2012, alle ore 11:59, Andrew Leach ha scritto:
> On 30 June 2012 10:42, Fabrizio Bartolomucci <[email protected]> wrote:
>> Thanks Larry,
>> actually that is quite strange given the coordinates seem to move on the
>> same direction while the drawn polyline seem to also have a reverse path. I
>> also tried to just print the first 100 dots, but they already featured that
>> odd behavior.
>> As for the origin, the main points, in effect corresponding to the threading
>> of the return path, are the positions of the bus stops of a bus line, and
>> the points in between are the ones returned by google to connect them
>> through roads. Could you point me to the points producing that weird effect
>> and/or to a web site where I may submit my points and have them drawn on a
>> map without having to mangle with the iOS app?
>
> I checked the first one
> 2012-06-29 17:16:27.947 inArrivo[6293:707] 41.702019, 12.345350
>
> which also appears slightly further down:
> 2012-06-29 17:16:27.977 inArrivo[6293:707] 41.702019, 12.345350
>
> so it's definitely the data. You could try and find a duplicate of
> every row like I did, but that might take some time. It's probably the
> only way though: can you load the points into a database to help you?
>
> I don't know of a site where you can submit a list of points though,
> other than one where they are encoded first, which isn't going to help
> find duplicate points.
>
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