Learning D3.js 5 Mapping - Second Edition

Cartograms

Cartograms do away with the area problem, by encoding your values to area size. A cartogram of our farmers' markets mapping the ratio to color and area size would look as follows:

A contiguous cartogram of farmers' markets

The area— and consequently the shape—of your map gets distorted in such a way that the area represents the value you want to visualize. It's great for Washington, D.C. which has been sized up significantly to be recognized as a farmers' markets heavyweight. In short, they solve the choropleth problem of attention theft, but create a new problem in that our geographical units are often hardly recognizable. Your ...