surveillance

observation that never stops

observation using closed-circuit television cameras

very careful and detailed observation

observation happening 24 hours a day

secret observation, often by official organizations

using electronic devices to monitor people

observation done without the subject's knowledge

formal term for observation using CCTV cameras

observation from the air (e.g., from planes, drones)

to be the subject of observation

to maintain continuous observation of someone or something

to begin observing someone or something

to perform the act of surveillance

a more formal way to say 'carry out surveillance'

a camera used to watch an area for security purposes

general term for tools used for surveillance (cameras, listening devices, etc.)

recorded video from a surveillance camera

a physical tape recording from a surveillance system (older technology)