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In fact, its history dates back to Ben Schneiderman’s compact visualization of an entire directory of files on a computer. The advantage of the treemap is the efficient use of space to represent large amounts of information. For the latter, it allows showing up to three levels of a hierarchy. For the former, it presents the category or entity with the highest value compared to the others. The table from which one creates the visualization has categories that display subcategories with their respective numerical values.įrom Data to Viz specifies that treemaps are used to show both the division of the whole and the hierarchical organization. Source: What it is for?Īccording to Data Viz Project, the treemap belongs to the graph family and helps compare and distribute data. Treemap of laughter expressions used on Reddit in 2019 organized by category. So, this type of visualization makes it possible to compare between subcategories and between categories.Ĭolors represent the classification between rectangles, which makes it easy to identify the categories. That means that the root node (category) total is the sum of the leaf nodes (subcategories). The root node is the first one (it does not arise from another one), while the leaf node detaches from another one and is the last in the hierarchy. The rectangles are called nodes and are of root or leaf type. The size of the rectangle corresponds to the value of the category or subcategory.
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It has the structure of a tree (hence the name) with the data organized in nested rectangles (one inside the other). What a treemap is?Ī treemap is a type of visualization that hierarchically displays data.