Re: Spy satellite?
Another good reason is that there may be nothing left to see from above, even a few hours later.
Break-up in the air and the pieces falling onto a jungle would look much the same before and after, especially if there was no fire on the ground. Even if it did make a hole in a jungle, how many big jungle trees succumb to rot and fall over every day? How many big trees are (mostly illegally) felled for their timber? How many small clearings are made by primitive farmers (slash and burn agriculture)?
The sea will also look much the same, apart from some floating seat cushions. AFAIK a one-foot square is about a spy-sat's resolution limit, and the sea is full of transient white patches (breaking waves).
And then there's cloud cover. Some parts of the world you have to wait weeks for blue sky. (London, from Xmas until recently, for one! )