title: How can I create a Google Visualization intensity/heat map using a KMZ document?
body: <p>I'd like to create a <a href="http://code.google.com/apis/visualization/documentation/gallery/intensitymap.html" rel="nofollow noreferrer">Google Visualization API intensity/heat map</a> based on UK counties.</p>
  
  <p>To do this, it appears that I need to use a custom KML/KMZ file that contains the county mapping data (which I've located).</p>
  
  <p>Could anyone provide me with a sample of how I can display an intensity map based on a KMZ file? I know how to display Google Visualization intensity maps in general. I just can't find any examples that use a custom KMZ file. </p>