The non-contiguous cartogram seems to solve a lot of the area distortions seen with traditional cartograms, while preserving the ability to identify areas by their shape lost with Dorling or Demers cartograms.
However, I can see how there might be problems related to the size of objects. Are there any practical guidelines on when the ability to comprehend these cartograms breaks down, either by:
- The ratio of the smallest to the largest value, or
- The ratio of the smallest original area to the largest (e.g. in a map of US states, the viewer might have difficulty figuring out whether the values were encoded in the object size or rather in the object's size relative to its original size)
Example cartogram with small states having large values:
Example cartogram with not much variation between values represented: