Spy balloons, due to their much lower altitude, can take higher resolution photos & more accurate 3D scans of facilities as well as pick up short range radio tr

Spy balloons, due to their much lower altitude, can take higher resolution photos & more accurate 3D scans of facilities as well as pick up short range radio transmissions (both intentional & unintentional) not possible from a spy satellite. I'm no expert but let's say you wanted detailed intel on a oil refinery, manufacturing plant or military facility. With a sensitive enough antenna a balloon fly-by might be able to pick up WiFi signals, keyfob codes, security radio crosstalk, even wireless keyboard emissions. Also, remember, China has extremely sophisticated facial recognition it uses to track its citizens. A fly-over of a facility at a shift-change could give them a lot of people to target for human-engineering attacks at the site's security.