An Unmanned Aerial Vehicle (UAV) is defined  as an aircraft flown with no pilot on board. UAVs are sometimes referred to as drones and the name can be used interchangeably. Unmanned Aerial System (UAS) is also a term that is commonly used. The vehicle is controlled either autonomously or with the use of a remote control by a pilot from the ground and can carry a wide range of imaging technologies including still, video and infrared sensors. UAVs are an emerging technology with many potential applications in the civil engineering field.