There are higher resolution images available at lower frequencies and low resolution images possible with high frequency.
Would it not possible to "zoom and enhance" a low resolution image to higher resolution one using historical high res data of the location and learning from object types and classification?
Sure. Probably provide pretty convincing high-detail images.
For the cases of most interest—i.e., when the new activity is unusual and unexpected—it will often be detailed, convincing, and completely wrong, though.
It would be nice UX enchantment if you will to what is a low res product.
A set of useful keywords would be "image sensor fusion".
Of course there would be limitations and most of the image updates would be boring (all the buildings and streets are still there) or lacking enough information to retrieve anything (new set of cars parked on the street) so you'd end up with highlights and uncertainties for changes overlaid on top of high confidence existing infra.