Plan-views in cartography

What prompted people to display and compose maps from the “above” perspective? Although “common-sensical” to us now, at the beginning of cartography (some 5,000 years ago on clay tablets?) the “from the sky” perspective seems to be a somewhat unique notion. I’m not proposing a “chariots of the sky” (visits in ancient times by extra-terrestrials) theory but rather the thought that it was a revolutionary and radical departure from a ground view.

Any thoughts or ideas?