View source for CSC220 Processing KML coordinates in Php

--[[User:Thiebaut|D. Thiebaut]] 14:10, 27 September 2010 (UTC)
----
__TOC__

==The Map on Google-Maps==
* <center>[[Image:KML_example.png|600px]]</center>

==The URL==
* Google MAP URL: http://maps.google.com/maps/mm?q=http://share.abvio.com/8c66/82ec/4c15/b2d6/Walkmeter-Walk-20100829-0750.kml&ie=UTF8&hl=en

==The KML File==

(you can get a copy of this file in your 220a-xx account by typing '''getcopy example1.klm''')

<code><pre>
<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2">
<Document>
<name>Walkmeter-Walk-20100829-0750.kml</name>
<Style id="currentPathStyle">
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<width>4</width>
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<Style id="officialPathStyle">
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<color>888d1baa</color>
<width>4</width>
</LineStyle>
</Style>
<Style id="bestIconStyle">
<IconStyle><Icon><href>http://share.abvio.com/i/iconBest.png</href></Icon>
<hotSpot x="0.5" y="0.0" xunits="fraction" yunits="fraction"/>
</IconStyle>
</Style>
<Style id="medianIconStyle">
<IconStyle><Icon><href>http://share.abvio.com/i/iconMedian.png</href></Icon>
<hotSpot x="0.5" y="0.0" xunits="fraction" yunits="fraction"/>
</IconStyle>
</Style>
<Style id="worstIconStyle">
<IconStyle><Icon><href>http://share.abvio.com/i/iconWorst.png</href></Icon>
<hotSpot x="0.5" y="0.0" xunits="fraction" yunits="fraction"/>
</IconStyle>
</Style>
<Style id="currentIconStyle">
<IconStyle><Icon><href>http://share.abvio.com/i/iconCurrent.png</href></Icon>
<hotSpot x="0.5" y="0.0" xunits="fraction" yunits="fraction"/>
</IconStyle>
</Style>
<Style id="startIconStyle">
<IconStyle><Icon><href>http://share.abvio.com/i/iconStart.png</href></Icon>
<hotSpot x="0.5" y="0.0" xunits="fraction" yunits="fraction"/>
</IconStyle>
</Style>
<Style id="finishIconStyle">
<IconStyle><Icon><href>http://share.abvio.com/i/iconFinish.png</href></Icon>
<hotSpot x="0.5" y="0.0" xunits="fraction" yunits="fraction"/>
</IconStyle>
</Style>
<Style id="mile1IconStyle">
<IconStyle><Icon><href>http://share.abvio.com/i/iconMile1.png</href></Icon>
<hotSpot x="0.5" y="0.0" xunits="fraction" yunits="fraction"/>
</IconStyle>
</Style>
<Style id="mile2IconStyle">
<IconStyle><Icon><href>http://share.abvio.com/i/iconMile2.png</href></Icon>
<hotSpot x="0.5" y="0.0" xunits="fraction" yunits="fraction"/>
</IconStyle>
</Style>
<Style id="mile3IconStyle">
<IconStyle><Icon><href>http://share.abvio.com/i/iconMile3.png</href></Icon>
<hotSpot x="0.5" y="0.0" xunits="fraction" yunits="fraction"/>
</IconStyle>
</Style>
<Style id="mile4IconStyle">
<IconStyle><Icon><href>http://share.abvio.com/i/iconMile4.png</href></Icon>
<hotSpot x="0.5" y="0.0" xunits="fraction" yunits="fraction"/>
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</Style>
<Style id="mile5IconStyle">
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</Style>
<Style id="mile6IconStyle">
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</Style>
<Style id="mile7IconStyle">
<IconStyle><Icon><href>http://share.abvio.com/i/iconMile7.png</href></Icon>
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<Style id="mile8IconStyle">
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<Style id="mile9IconStyle">
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<Style id="mile10IconStyle">
<IconStyle><Icon><href>http://share.abvio.com/i/iconMile10.png</href></Icon>
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<Style id="mile11IconStyle">
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-72.70036616666665,42.34702501666668
-72.69271225000001,42.34235086666666
-72.69267878333333,42.34254801666666
-72.69267330000000,42.34261633333334
-72.69409016666667,42.34391306666667
-72.69424906666666,42.34403235000000
-72.69433810000001,42.34412963333332
-72.69433810000001,42.34412963333332
</coordinates>
</LineString>
</Placemark>
</Folder>
</Folder>
<Folder>
<name>Splits</name>
<open>1</open>
<Placemark>
<name>Mile 01 - Average 9:30 /mile</name>
<styleUrl>#mile1IconStyle</styleUrl>
<Point>
<coordinates>-72.70065718058417,42.35034620333218</coordinates>
</Point>
</Placemark>
<Placemark>
<name>Mile 02 - Average 7:02 /mile</name>
<styleUrl>#mile2IconStyle</styleUrl>
<Point>
<coordinates>-72.69023228509374,42.34685875377243</coordinates>
</Point>
</Placemark>
<Placemark>
<name>Mile 03 - Average 5:31 /mile</name>
<styleUrl>#mile3IconStyle</styleUrl>
<Point>
<coordinates>-72.67438154801597,42.33901711755097</coordinates>
</Point>
</Placemark>
<Placemark>
<name>Mile 04 - Average 5:01 /mile</name>
<styleUrl>#mile4IconStyle</styleUrl>
<Point>
<coordinates>-72.65690610354574,42.33421477514884</coordinates>
</Point>
</Placemark>
<Placemark>
<name>Mile 05 - Average 4:50 /mile</name>
<styleUrl>#mile5IconStyle</styleUrl>
<Point>
<coordinates>-72.63827759351520,42.32971094144124</coordinates>
</Point>
</Placemark>
<Placemark>
<name>Mile 06 - Average 5:14 /mile</name>
<styleUrl>#mile6IconStyle</styleUrl>
<Point>
<coordinates>-72.62312332785325,42.33428328247771</coordinates>
</Point>
</Placemark>
<Placemark>
<name>Mile 07 - Average 4:52 /mile</name>
<styleUrl>#mile7IconStyle</styleUrl>
<Point>
<coordinates>-72.60548605458132,42.33999070825788</coordinates>
</Point>
</Placemark>
<Placemark>
<name>Mile 08 - Average 12:19 /mile</name>
<styleUrl>#mile8IconStyle</styleUrl>
<Point>
<coordinates>-72.60283801139165,42.34127784195404</coordinates>
</Point>
</Placemark>
<Placemark>
<name>Mile 09 - Average 4:48 /mile</name>
<styleUrl>#mile9IconStyle</styleUrl>
<Point>
<coordinates>-72.62073779424851,42.33537282683031</coordinates>
</Point>
</Placemark>
<Placemark>
<name>Mile 10 - Average 6:10 /mile</name>
<styleUrl>#mile10IconStyle</styleUrl>
<Point>
<coordinates>-72.63579768062351,42.32850918946667</coordinates>
</Point>
</Placemark>
<Placemark>
<name>Mile 11 - Average 5:15 /mile</name>
<styleUrl>#mile11IconStyle</styleUrl>
<Point>
<coordinates>-72.65361589561719,42.33441018120028</coordinates>
</Point>
</Placemark>
<Placemark>
<name>Mile 12 - Average 4:55 /mile</name>
<styleUrl>#mile12IconStyle</styleUrl>
<Point>
<coordinates>-72.67259450544859,42.33756117915090</coordinates>
</Point>
</Placemark>
<Placemark>
<name>Mile 13 - Average 5:20 /mile</name>
<styleUrl>#mile13IconStyle</styleUrl>
<Point>
<coordinates>-72.68639174648294,42.34687402676975</coordinates>
</Point>
</Placemark>
<Placemark>
<name>Mile 14 - Average 5:08 /mile</name>
<styleUrl>#mile14IconStyle</styleUrl>
<Point>
<coordinates>-72.70087884630394,42.35314078781894</coordinates>
</Point>
</Placemark>
<Placemark>
<name>Mile 15 - Average 4:51 /mile</name>
<styleUrl>#mile15IconStyle</styleUrl>
<Point>
<coordinates>-72.69320545710393,42.34310336988481</coordinates>
</Point>
</Placemark>
</Folder>
</Document>
</kml>
</pre></code>

==Reading Files in Php==

* Local files can be read very easily in Php, as follows:

<code><pre>
 $lines = file( 'play.txt' );
 
 //--- print each line in a list ---
 print "<ul>\n";
 for ( $i=0; $i<count( $lines ); $i++ ) 
    print "<li>$i: $lines[$i]\n";
 print "</ul>\n";

</pre></code>

* The code above reads all the lines from the text file '''play.txt''' and displays them as a numbered list, using the $i index as a counter (the line numbering will start at 0).

==Questions==

; Question 1
: Write the code necessary to extract all the coordinates from the KML file and store them in two arrays, '''$x''' and '''$y'''.

; Question 2
: use functions

<onlydft>
<code><pre>
<html>
<body>

<?php
//--- klm file ---
$fileName="walkmeter.kml";

//--- read the file ---
$lines = file( $fileName );

//--- boolean controlling reading of coordinates from file---
$coordinates = False;

//--- extract coordinates from file ---
for ( $i=0; $i < count( $lines ); $i++ ) {
    $line = trim( $lines[$i] );

    //--- recognize starting tag ---
    $pos1 = strpos( $line, "<coordinates>" );
    if ( $pos1 !== False ) 
         $coordinates = True;

    //--- locate closing tag ---
    $pos2 = strpos( $line, "</coordinates>" );
    if ( $pos2 !== False ) 
         $coordinates = False;

    //var_dump( $line );
    //var_dump( $pos1 );
    //var_dump( $pos2 );

    //--- skip all non-coordinate lines ---
    if ( $pos1 !== False || $pos2 !== False ) {
        //print "pos1 or pos2\n";
        continue;
    }

    //--- found coordinate lines ---
    if ( $coordinates ) {
        print "$line\n";
        $xy = explode( ',', $line );
        if ( count( $xy ) == 2 ) {
           $x[] = $xy[0];
           $y[] = $xy[1];
        }
    }
}

//--- display the coordinates ---
print "\n\n<ul>\n";
for ( $i=0; $i < count( $x ); $i++ ) {
    printf( "<li> x=%f y=%f\n", $x[$i], $y[$i] );
}

//--- display the box surrounding the coordinates ---
print "</ul>\n";
printf( "<br />Rectangle: top-left (%f, %f) bottom-right(%f,%f)\n<br />",
        min( $x ), min( $y ), max( $x ), max( $y ) );
?>

</body>
</html>
</pre></code>
</onlydft>

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[[Category:CSC220]][[Category:Exercises]][[Category:KLM]]