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    <p>Since you asked for guidelines, an example kml document looks like this:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;kml xmlns="http://www.opengis.net/kml/2.2"&gt; &lt;Document&gt; &lt;Placemark&gt; &lt;name&gt;New York City&lt;/name&gt; &lt;description&gt;New York City&lt;/description&gt; &lt;Point&gt; &lt;coordinates&gt;-74.006393,40.714172,0&lt;/coordinates&gt; &lt;/Point&gt; &lt;/Placemark&gt; &lt;/Document&gt; &lt;/kml&gt; </code></pre> <p>It seems you can keep the <code>&lt;name&gt;</code> field the same, you can combine the items in xml fields <code>&lt;city,&lt;state&gt;,&lt;country&gt;</code> to klm field <code>&lt;address&gt;city,state,country&lt;/address&gt;</code> or use it as a kml <code>&lt;description&gt;</code> tag (User-supplied content that appears in the description balloon ) as kml will use long and lat to determine a point if it is provided instead of using an address. Transform the xml <code>&lt;longitute&gt;,&lt;latitudite&gt;</code> need to be turned into a kml <code>&lt;point&gt;&lt;cordinates&gt;longitute,latatude&lt;/cordinates&gt;&lt;/point&gt;</code></p> <p>So you need to transform your klm document into something like this:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;kml xmlns="http://www.opengis.net/kml/2.2"&gt; &lt;Document&gt; &lt;Placemark&gt; &lt;name&gt;Sharon Appartments&lt;/name&gt; &lt;description&gt;Dallas, California, USA&lt;/description&gt; &lt;Point&gt; &lt;coordinates&gt;115.23412,34.734121&lt;/coordinates&gt; &lt;/Point&gt; &lt;/Placemark&gt; &lt;Placement&gt; Put item 2 details here &lt;/Placement&gt; . . . &lt;Placement&gt; Put item 20000 details here &lt;/Placement&gt; &lt;/Document&gt; &lt;/kml&gt; </code></pre> <p>I got this from the <a href="https://developers.google.com/kml/documentation/kmlreference" rel="nofollow">https://developers.google.com/kml/documentation/kmlreference</a> , </p> <p>Now for the heat map part, if you can transform your file into a list of lat and longs, you can put it into the python program on this webpage: <a href="http://jjguy.com/heatmap/" rel="nofollow">http://jjguy.com/heatmap/</a> and it will produce a kml overlay for google maps based on that data, you need to combine that overlay with your kml file for your city data to get a complete map.</p>
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    1. POHow to convert my xml file to kml file
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    1. CODo I manually convert the entire data because i have thousands of records? I tried to look for convertors but I didn't find any...
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    2. COProgrammaticly, you could use a small python script that reads a few tags and then saves it in the new format, or you could write an http://en.wikipedia.org/wiki/XML_transformation_language file that would transform it. If you want to do it manually, which wouldn't be hard, use a text editor like Geany and use find an replace and checkbox the "use escape sequences". Find `<longitude>` and replace with `<point><coordinates>`, find `</longitude>\r\n<latitude>` and replace with a comma, with \r\n being your line return for your OS(could be \r, \n, ect depending on what the file is using", ect.
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    3. COThe problem would come from the <row id="2"> fields and you would need to use a regexp for that in geany. Of course this is just a guildline, I personally would just modify the heatmap.py file from that website jiguy.com/heatmap to read my xml file and spit out the correct kml.
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