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Wireless security cameras function best when there is a clear line of sight between the camera(s) and the receiver. If digital wireless cameras are outdoors and have a clear line of sight, they typically have a range between 250 and 450 feet. If located indoors, the range can be limited to 100 to 150 feet.
Hidden cameras are often considered a surveillance tool. The term "hidden camera" is commonly used when subjects are unaware that they are being recorded, usually lacking their knowledge and consent; the term "spy camera" is generally used when the subject would object to being recorded if they were aware of the camera's presence.
The AN/SPY-1 [a] is a United States Navy passive electronically scanned array (PESA) 3D radar system manufactured by Lockheed Martin, and is a key component of the Aegis Combat System. The system is computer controlled and uses four complementary antennas to provide 360-degree coverage.
DS Night Vision offers road visibility by night. An infrared camera in the front grill identifies objects, pedestrians and animals on the road at a distance of up to 100m. [citation needed] A digital instrument cluster shows the driver the area around the car in infrared, with a yellow line around any sources of potential danger.
Sometimes normal cameras are used, but the photographer is concealed. Sometimes the camera itself is disguised or concealed. Some obvious element of concealment (or great distance) is generally needed to make such photography fall under the category of "secret photography" rather than street photography or documentary photography.
[129] [130] [131] An aerial motion imagery surviellance system was deployed more narrowly in Lancaster, California starting in 2012. [130] [132] [133] [134] WAMI systems such as ARGUS WAMI are capable of live viewing and recording a 68 square mile area with enough detail to view pedestrians and vehicles and generate chronographs.
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