
The star plot is a way of displaying multivariate data. Each observation is represented as a "start" and the length of the rays are made in proportion to the size of that variable.
This is a correlation matrix taken from: http://www.kltprc.net/policynotes/Gifs/Tab_005A_4.gif
This is a type of map that shows correlation over several variables. The diagonal elements within are always equal to 1.0
This similarity matrix shows the temporal similarity of a group of 512 photos and is taken from: http://www.fxpal.com/systems/MediaAnalysis/sim10000.gif
This type of map is a matrix of numbers that represents similarity between data points.