eye in the sky
Overhead surveillance of some kind, such as a camera or a police helicopter. Guys, that store we robbed had an eye-in-the-sky—the cops are definitely going to find us! The eye-in-the-sky illuminated the fleeing suspect as officers pursued him on foot.
n. an overhead surveillance camera, usually in a dome; a traffic police helicopter. The cops used an eye-in-the-sky to get the evidence and make the arrest.