sentences:  Most police helicopters are fitted with a sphere shaped housing or pod usually under the nose of the aircraft the purpose of which is to support and stabilize two cameras using a gyroscope stabilization system.The two cameras are a standard "day camera" (a colour camera equipped with a powerful zoom lens) and a thermal imaging camera, which enables heat to be detected and is usually utilized during hours of darkness or in the search for persons in hiding.The cameras are normally connected to controls located in the cabin of the aircraft that allow the air observer to directly control them.