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Heat map
Data visualization technique / From Wikipedia, the free encyclopedia
"Colormap" redirects here. For indexed palettes, see Indexed color.
A heat map (or heatmap) is a 2-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.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/4/48/Heatmap.png/640px-Heatmap.png)
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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.[1]