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Treemap is a space-constrained visualization technique for hierarchical structures. It was designed in 1991 by Ben Shneiderman to solve problem of a filled hard disk, and now has become one of the most well-know techniques of information visualization. Treemaps display hierarchies of data as groups of rectangles that can be arranged, sized and colored to graphically reveal underlying data patterns. This visualization technique allows end users to easily recognize complicated data relationships that are otherwise non-obvious.

Some applications

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