How do remote cameras work?

Question

For instance traffic cameras on highway overpasses, are they connected to some sort of power supply or battery powered? If not battery powered could they be? How far could the distance be? Could you set a camera up in the jungle to observe some wildlife and have the feed come to your computer in Canada? Could it be broadcast on TV? Would it or could it be fed through satellite?

Answer 1

Well if NASA can send pictures from Mars, I am sure the technology exists to send pictures or video via either wired or wireless from any place on Earth to any other place. It is not going to be cheap though :-)