What is "heat map"

alt. A two-dimensional graphic representation of data in which different values are represented by different colours n. A two-dimensional graphic representation of data in which different values are represented by different colours

A heat map (or heatmap) is a graphical representation of data where the individual values contained in a matrix are represented as colors. Fractal maps and tree maps both often use a similar system of color-coding to represent the values taken by a variable in a hierarchy.