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Comment by short_sells_poo

14 hours ago

Population density is literally measured over a planar metric: people/km^2

You are suggesting it's measured over a cube volume?

3d population density would be an interesting measure, though. It would provide a better feel for how cramped a populated volume actually is.

It would have to be the displacement volume, to account for cities with only a few really tall buildings, and also somehow adjusted for buildings with high ceilings.