Comment: "just seeing if you're paying attention"

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"just seeing if you're paying attention"

This common phrase most accurately translates to: "I was caught talking out my
a$$ but won't admit it, so I'll say it was intentional."

Drop your "height" crap, it's meaningless. RED HERRING! The examples you're giving are what you do to obtain the correct "distance". You don't need to know the "height" of anything, if "distance" can be obtained by another parameter; i.e. WIDTH.

"If Tyranny and Oppression come to this land, it will be in the guise of fighting a foreign enemy." -- James Madison