Heat map

Heat map generated from DNA microarray data reflecting gene expression values in several conditions (Eisen et al.)
Shaded matrix display from Toussaint Loua (1873)
A heat map showing the RF coverage of a drone detection system

A heat map (or heatmap) is a two-dimensional data visualization technique that represents the magnitude of individual values within a dataset as a color. The variation in color may be by hue or intensity.

In some applications such as crime analytics or website click-tracking, color is used to represent the density of data points rather than a value associated with each point.

"Heat map" is a relatively new term, but the practice of shading matrices has existed for over a century.

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