ULTRA-WIDE-FIELD TIME-LAPSE PHOTOGRAPHY FROM AIRCRAFT
WOODS HOLE OCEANOGRAPHIC INSTITUTION MA
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Aerial photographs of the earth, sea surface, and cloud forms taken at 1-sec intervals are considered acceptable records for a detailed and objective flight log. The angular dimensions of distant objects can be reduced to approximate linear dimensions from a knowledge of the air speed and time required to close with them after sighting more exact linear measurements are possible if the perspective geometry of the changing point of view and distortions of the optical system are taken into account. Possible procedures for horizontal wide-field photography from the air are discussed in which the radially symmetrical object space is assumed spherical, cylindrical, or toroidal. Although barrel distortions on flat film systems may be removed during projections, such systems are not recommended for general use. Orthographic imagery is compared with the gnomonic projection obtained with most camera lenses. Schematic diagrams of reflecting and refracting orthographic systems are presented, and several systems now in use are evaluated.