I'm working on a project that maps the places of origin of the "letters to the editor" submitted to a magazine.
I'm using CartoDB's Torque viz to show the evolution of this data through time.
I would like to show that multiple letters originated from the same address by increasing the size of the bubble at that address. For example, the Marker Fill is 4 for one letter from a particular address, 6 for two letters, 8 for three letters, etc.
Does anyone have any suggestions about how I might accomplish this?
Many thanks in advance!