Has anyone successfully created a heat map of the world using Google map? I read in few places that its possible but cannot seem to find the correct way to do it.
I need to create a heat map which is based on the global map, and shows the performance all of the world's unemployment rate. Some alike this swine flu map:
Swine flu heat map: http://www.imapbuilder.com/customization/samples.php?sampleid=swine-influenza
However I would prefer a Google Map solution as I also need to zoom into country / state level, is there a Google map plug-in available for such purpose?