olemus
maatriksdiagramm, milles
andmete väärtusi esitatakse
värvustena või halliastmiku toonidena

Oxford Languages:
1. a representation of data in the form of a map or diagram in which data values are represented as colours
2. an image or map representing the varying temperature or infrared radiation recorded over an area or during a period of time

näiteid
https://plot.ly/~malwareanalysistech/11.png

http://www.heatmapapi.com/Example_1.aspx

https://duckduckgo.com/?q=heatmap+in+security&t=h_&iar=images&iax=images&ia=images

ülevaateid
https://en.wikipedia.org/wiki/Heat_map