choropleth

Regions you already have, colored by one number each. Shade carries the value, so what you read is where the highs sit and whether they touch. It answers a clustering question, not a ranking question. The trap is built in: a large empty region shouts and a small dense one whispers, because the eye is reading area while you meant it to read color.

Regions you already have, colored by one number each. Shade carries the value, so what you read is where the highs sit and whether they touch. It answers a clustering question, not a ranking question. The trap is built in: a large empty region shouts and a small dense one whispers, because the eye is reading area while you meant it to read color.

Example

Best when you have one number per region and want to know whether the high ones are neighbors.