How to Read a Treemap Visualization

1 dimension (hierarchical or not) + 1 metric

A Treemap visualization represents a hierarchical dimension by encoding a metric on each node of the hierarchy.

Example : The hierarchical dimension of geography. On the first level, we can see the distribution of the metric between continents. We can then explore a continent to see the distribution between countries, etc.

Let’s say you want to check out where your visitors are located.



Treemap Captain Dash 1

Let's Analyze A Bit

At a mere glance, we can see that nearly have of your visitors are in Europe, a quarter in the Americas, the remainder in Asia, and but a few in Oceania and Africa. The “Explore” button gives us a closer look at Europe, revealing that half of those visitors are in the West and the rest are split evenly between North, East, and South.

Treemap Captain Dash 2

Another “Explore” click and we see that more than half of your Western Europe visitors are in France.

Treemap Captain Dash 3

A look at the Americas reveals that the United States accounts for 86% of viewers on the continent.

Treemap Captain Dash 4

Is that where you should open your new office?

In order to play around some more with Treemap visualizations you can head over to the visualization lair at