This site contains: mathematics courses and book; covers: image analysis, data analysis, and discrete modelling; provides: image analysis software. Created and run by Peter Saveliev.

From Intelligent Perception

Aka "taxicab metric"..

A special kind of metric or norm:

To find the distance between the vectors go along the grid $$‖X - Y‖ = |X_1-Y_1|+|X_2-Y_2|.$$

Its circle is the square...