Has anyone been able to build a heat map overlaid on a map? For example, I want to display a total number of users visually based on where in the world they live. For example, I want to see a large circle over NY City if I have 100 users who are from NY City, if I have more users the circle is larger, if less the circle should be smaller.
I have not seen any plugins to help with this. Here is an example.