Comments on: Data visualization of the day, unemployment edition A slice of lime in the soda Sun, 26 Oct 2014 19:05:02 +0000 hourly 1 By: Brian Timoney Fri, 17 Apr 2009 03:27:57 +0000 Felix:

Humans aren’t very good are perceiving differences in areas so cartographers have often resorted to perceptual scaling to compensate.

More than you ever wanted to know here

@Chris: Great map–we need more dynamic time-series displays on the web…


By: Chris Wilson Wed, 15 Apr 2009 22:24:57 +0000 Hey Felix, thanks much for the link. To answer your question about scale: The circles are proportional in area to the number of jobs lost, so the radius (or diameter) will scale by the square root of the ratio between the larger and smaller number. So the 50,000 circle, which represents five times as many jobs as the 10,000 circle, is about 2.2 times wider (that is, sqrt of 5). This makes sense visually, I think, if you picture how many 10,000 dots put side-by-side would fit into the 50,000 circle — just over two. Five would fit perfectly if we could lump them together like putty, though this gets hard to visualize (at least for me).