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Aerial photography is the taking of photographs of the ground from an elevated position. The term usually refers to images in which the camera is not supported by a ground-based structure. Platforms for aerial photography include fixed-wing aircraft, helicopters, multirotor Unmanned Aircraft Systems (UAS), balloons, blimps and dirigibles, rockets, kites,parachutes, stand-alone telescoping and vehicle mounted poles. Mounted cameras may be triggered remotely or automatically; hand-held photographs may be taken by a photographer.