title: Algorithm for heat map?
body: <p>I have a list of values each with latitude and longitude.  I'm looking to create a translucent heatmap image to overlay on Google Maps.  I know there are server side and flash based solutions already, but I want to build this in javascript using the canvas tag.</p>
  
  <p>However, I can't seem to find a concise description of the algorithm used to turn coordinates and values into a heatmap.  Can anyone provide or link to one?</p>
  
  <p>Thanks.</p>