The process of stereoscopic aerial photographs cargo plane with a vertical chamber is called its focal length, which helps us determine the scale " ballpark "of photographs. Depending on the scale to which photos we want the plane to fly to a certain height, which will be influenced by the movements of aircraft in flight. In general passes are east-west and rev é s, and are made early in the morning or late afternoon, when shadows MnAs. Frames are more than 50% overlap with each other, with three consecutive forms the "stereoscopic pair" where the whole is central in relief.
stereo image pair, The Marraco
Aerial photographs of the territory with stereoscopy began during World War . In Spain attempts were made during the two world wars (I thinkr a flight of 1923 by the Sierra de Madrid). The first flight by the whole Spain is called "American flight, which did the USAF between 1956 and 57 on a scale of 1:33.000. Were followed by flights at very different scales, General maso least every 10 years, is in fact one of the best instruments to observe the area's development. They are also used to produce topographic maps using special tools.
To see these photos do not use glasses but an instrument called a stereoscope . Consists of four mirrors and send the image of each photograph & iacuteand, as the corresponding eye, the brain does the rest.
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