THE RECTIFICATION OF AIR PHOTOGRAPHS |
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| Abstract: | AbstractThe application of the formulae for the rectification of air photographs, with or without change of scale, becomes greatly simplified when the tilt of the photographs is small. Usually this tilt does not exceed 2°, and the rectification may take place in a comparatively simple form of camera and with hardly any computations, since, as will be shown, variations of the camera settings are then accurately linear in relation to the tilt. It will also be shown that in the result the errors due to small differences in the focal length of the air camera lenses, to distortion from the pressure plate, and to average shrinkage of the film, can be automatically eliminated. |
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