Definition

According to wikipedia:

In information visualization and computing, treemapping is a method for displaying hierarchical data by using nested rectangles.

Videos

On Demand videos at Tableau include this three-for-one special on Treemaps, Bubble Charts AND Word Clouds:

http://www.tableau.com/learn/tutorials/on-demand/treemaps-word-clouds-and-bubble-charts-chart-type

Tech Analytics look at the same three chart types:

WCI Consulting’s video includes a few chart types, including Tree maps:

Eugene O’Loughlin posted this video:

Blog posts

Carly Capitula’s “Tableau Essentials” series for interworks.com provides another quick post:

https://www.interworks.com/blog/ccapitula/2014/10/14/tableau-essentials-chart-types-treemap

While The Information Lab go into more detail:

http://www.theinformationlab.co.uk/2015/02/10/show-treemaps/

This is supplemented with an earlier example looking at the relative insights provided by bar charts versus treemaps:

http://www.theinformationlab.co.uk/2014/12/16/treemap-vs-bar-chart-end-treemap/

Tableau’s Online Help guides you through the steps of creating this chart type:

https://onlinehelp.tableau.com/current/pro/online/mac/en-us/buildexamples_treemap.html

I have written my own post about the use of treemaps on #MakeoverMonday:

https://wordpress.com/post/learningtableaublog.wordpress.com/1410

Example workbooks

https://public.tableau.com/views/TreemapoftheRPGcommunity/Treemap?:embed=y&:showVizHome=no&:showTabs=y&:display_count=y&:display_static_image=y&:bootstrapWhenNotified=true

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