Scaling in RTS games?

[GoldenScorpions]

How can we go about making calcs and scaling from RTS games? Generally, buildings (and sometimes large units) are scaled down from what their real size would be, so they can fit on the screen and not overwhelm.
For example, in one of them, here's what a house looks like, compared to soldiers. While here is how a city looks like. Obviously, houses (with a floor, at that) aren't that small compared to humans. And cities don't look like and aren't connected like that.
What should be done, then? If it's called a "Large City" in-game, should it be treated as an actual large city for the purpose of stats?

 

[DarkDragonMedeus]

I'd avoid pixel scaling in gameplay if it's prone to give some gross underestimations of building sizes and/or exaggerations of human sized characters; though using the classic A > B > C mindset might have some bearing. You can otherwise try to compare houses to regular houses individually. But not sure how to specifically calculate "Large City" descriptions.