\"scale\" is a very subjective thing in this business.
Some are from the ground to the eyes, others are to the top of the head. Some say for an average person, others say for a 6\' tall man.
Scale creep is real. Look at an older mini and notice how much smaller it is than the current \'standard\'.
Horizontal Scales may be different for terrain than for minis:
D&D is played on 1\" = 5\' or 1:60
Clicks are played on 1.5\" grid.
Warlord, Warhammer and others use a ruler without really defining what an inch or centimeter are representing.
Classic Battletech was played on a 100 meter hex, but you could only fit one mech in a hex - go figure.