According to AI, an equivalent would be roughly when Google maps shows you 10mi/20km reference scale.
Turning off the labels, aliens would probably assume that the world is naturally full of green stuff that is dealing with some strange grey infestation.
Even on that scale, major roads and agricultural grids are clearly visible. The mark of abstract intelligence is unmistakeable.
> According to AI
But what is the actual source?
Spectral analysis at that resolution would be much more telling.
Turning off what labels?
On that scale, we really do look like mold.
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> aliens would probably assume that the world is naturally full of green stuff that is dealing with some strange grey infestation.
I think they would draw the correct conclusion, actually. I know it's popular to compare humans to mold or cancer or whatever these days, but this kind of thing is both unrealistic and insulting to the aliens, who by the definition of the scenario are at least as smart as we are, quite probably more.