PHP - Parse dynamic Google Maps KML to extract polyline?

joeKel73 · 27-04-2011 04:52PM #1

Hey,

I am working on a project that gets walking directions from Google Maps via a set of coordinates. Like this.

I want to use that overlay, and can extract it by adding &output=kml to the URL like this.

That's fine, but I only want the polyline element of the kml, how can I parse the KML url above to echo out just the coordinates that are within the line string and coordinates tag.

<LineString>
<coordinates>
THIS
</coordinates>
</LineString>

I am hoping to echo out

My own beginning of a KML, then open new polyline element
the coordinates from above
close the polyline element and continue with my own KML

Any tips or directions how to parse the Google Maps KML URL?

Thanks!

Webmonkey · 27-04-2011 04:59PM

foto joe wrote: »

Hey,

I am working on a project that gets walking directions from Google Maps via a set of coordinates. Like this.

I want to use that overlay, and can extract it by adding &output=kml to the URL like this.

That's fine, but I only want the polyline element of the kml, how can I parse the KML url above to echo out just the coordinates that are within the line string and coordinates tag.

<LineString>
<coordinates>
THIS
</coordinates>
</LineString>

I am hoping to echo out
My own beginning of a KML, then open new polyline element

the coordinates from above

close the polyline element and continue with my own KML

Any tips or directions how to parse the Google Maps KML URL?

Thanks!

It's just XML. Use a XML parser with your language of choice. Should be straight forward enough.

Just saw PHP you using. That should make it easier again. Do a google search.

Example: http://fuelyourcoding.com/reading-xml-with-php/

joeKel73 · 27-04-2011 05:51PM

Got it thanks!

Was missing the loop through all the earlier <Placemark> tags. :rolleyes:

[PHP]<?php
$completeurl = "http://maps.google.ie/maps?f=d&source=s_d&saddr=53.277840,-9.052606&daddr=53.274952,-9.0528959+to:53.276890,-9.056983&hl=en&mra=ltm&via=1&dirflg=w&sll=53.274869,-9.054505&sspn=0.003214,0.010568&ie=UTF8&ll=53.276242,-9.054505&spn=0.003214,0.010568&t=h&z=17&output=kml";
$xml = simplexml_load_file($completeurl);

$placemarks = $xml->Document->Placemark;

for ($i = 0; $i < sizeof($placemarks); $i++) {
$coordinates = $placemarks[$i]->GeometryCollection->LineString->coordinates;

echo $coordinates;
}
?>[/PHP]

PHP - Parse dynamic Google Maps KML to extract polyline?

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