Yes, I do. I've built software to detect such changes as soon as possibly by analysing flyover data. In our case stereo imaging to also get height information. Only big cities do that. In small cities people talk and word gets out. The only problem is to detect moving parts (trucks), temp. parts (parked vehicles, containers) and seperate trees from buildings. Most of the flagging was done manually.

People just need to pain everything with this:

https://en.wikipedia.org/wiki/Vantablack

All features become invisible, black as could be.

Superblack spray paint is very expensive (eg on a roof of an illegal building) and the image would make it clear that something is hidden there and immediately flagged for manual inspection.

Clouds also don't help as the city only does flyovers on bright summerdays without any clouds. Google maps adds a lot of articial clouds, but that's probably from their gov. sources to hide something sensitive.