Thanks a lot!

Regards from Mexico

I’m working with encoded polygons both using your PHP port and the original Javascript version of the dpEncode utilities.

Everything works great, however am having issues using my complex polygons within Google Static Maps. I may be SOL (Sh*t out of Luck), but no hurt in seeking some advice.

http://code.google.com/apis/maps/documentation/staticmaps/#Paths

Basically when using a simple encoded polygon things work fine. However when using a complex encoded polyline (72 points used to plot a radius circle) I get nothing but problems.

Pretty sure that the underlyiing issue is that the Google Static Map API does not allow me to supply the encoded ‘zoomLevels’ like the JS API does (using GPolyline.fromEncoded).

This Works

While…

This does not

I’ve also tried passing the points to the static maps but of course the request URI is too long.

Encoded Polyline:

iuzxDrqatQfCipBxKmoBdTwmBl\ekBnd@wgBfl@qcBrs@q~Apz@{xAdaAorAdgAokAtlA{cApqAw{@xuAes@jyAej@h|A{`@n~AiW~_BqMt`BwCt`BbD|_B~Ml~AtWf|Afa@fyAlj@tuAls@jqA|{@nlA|cA~fApkA~`AlrAlz@xxAns@j~A`l@hcBjd@ngBh\xjBbTjmBvK`oBfCzoBgC|oBwK`oBcTjmBi\xjBkd@ngBal@hcBos@j~Amz@xxA_aAlrA_gAnkAolA~cAkqA|{@uuAjs@gyAnj@g|Afa@m~AtW}_B|Mu`BdDu`BwC_`BqMo~AiWi|A}`@kyAcj@yuAes@qqAw{@ulA{cAegAokAeaAorAqz@{xAss@q~Agl@qcBod@ygBm\ckBeTwmByKmoBgCkpB

Encoded Levels:

PCECGCFDCICECGCFDCKCECGCFDCICECGCEDCLCDECGCECICDFCGCECKCDFCGCECICDFCGCECP

Something tells me I’m trying to do way too much with the Static Maps.

I haven’t really done any optimizing on this site, so there’s a lot of things I could do. If only I can find the time…

By the way, on your server there are a few things to be optimized, according to YSlow…

http://www.wanderservice-schwarzwald.de

Use Firefox, IE ist too slow.

Our next step are encoded and reduced polylines for each zoom level. Currently zoom ist not available, but it works on all all zoom levels.

Any idea on how I can join/split several polylines into one (polycluster ) on different zoom levels?

You would not believe it!
It was the case of PHP parser version. I had early PHP5 which doesn’t support some methods and statements.
Thank you again, Gabriel,, for your help!
Almost whole day lost on searching for the case

What I do have experience of is doing that same thing on SQL Server 2008. By using the method STUnion() I’ve been able to merge several polylines into one.

@pracus: I’m sorry but i can’t reproduce your error. Are you sure you’re using the right polylineEncoder? Maybe if you can email your files I can take a look at it.

// Include the file containing the class
include(“polylineEncoder.php”);

// Create a nested array containing the coordinates
$points = array(
array(
59.6919,
17.8582
),
array(
59.3030,
18.0395
),
array(
58.9789,
17.5341
)
);

// Create a new instance of PolylineEncoder and supply the array
// as an argument to the constructor
$polylineEncoder = new PolylineEncoder($points);

// Encode the coordinates by calling dpEncode(), it returns an array containing the
// encoded coordinates and levels.
$encoded_points = $polylineEncoder->dpEncode();

header(“Status: 200″);
header(“Content-Type: text/html” );
print “Encoded points string: “.$encoded_points["Points"];

Do you have any idea what is the reason of such error:
“Parse error: syntax error, unexpected T_ARRAY, expecting ‘)’ in /home/pracus/public_html/minuta_pl/maps/polylineEncoder.php on line 69″
when trying to display this URL: http://minuta8.pl/maps/example.php ?

polylineEncoder.php file contains exactly the same source as your class file upon, no character is changed and example.php contains:

dpEncode();

header(“Status: 200″);
header(“Content-Type: text/html” );
print “Encoded points string: “.$encoded_points["Points"];
?>

I don’t understand what’s wrong.
Thank you in advance!

As you can see from http://www.saveourwaterways.info/test.phtml, using the polyline encoder class, the ends of each succeeding waterway joins up to the beginning of the next in sequence.

What I am planning is to draw each of the 80 waterways as a separate polyline but it concerns me that this will mean 80 overlays which suggest to me that it might be sluggish. I wondered if anyone has any ideas how I could insert a start and end point to each waterway so I can use just one layer without them merging with each other?

Cheers

Will

Sincerely, Your Reader.

I haven’t done anything like that for the PHP-class but it’s a great idea. I will look into it when I find the time.

P.S Mark has made a C# class, I’ve refactored the PHP code. /Gabriel

While I like the ability to encode the line and improve loading speed for the client, I would of course still store the data in both a geometry object, and encoded string. If you could add an option to your class that would take a mysql geometry object, or linestring, and do the rest from there, it would make it even more useful in the server environment. If not I can still write this for my own implementation, but I think others will like it as well.

Finally, if you have nothing else to do, what better than pull out your hair and build an SQL SP to achieve encoding?

Thanks.

Here’s my PolylineEncoder class.