noun
ADJECTIVE
▪ close , constant , regular , round-the-clock , routine
▪ covert , secret
▪ aerial , electronic , Internet , satellite , video
▪ CCTV , closed-circuit television (both esp. BrE )
▪ military , police
▪ health , medical
VERB + SURVEILLANCE
▪ be under
▪
The suspects are under police ~.
▪ keep sb/sth under , place sb/sth under , put sb/sth under
▪
The country's borders are kept under constant ~.
▪ carry out , conduct , do
▪
The army carried out covert ~ of the building for several months.
▪ increase , reduce
SURVEILLANCE + NOUN
▪ camera , device , equipment
▪ footage , tape ( AmE ), video
▪
The images were covertly captured on ~ tape.
▪ method , operation , programme/program , system
▪ aircraft
▪ flight
▪ team