Abstract
Abstract Nimbus II APT photography, when properly reproduced, i.e., by a modified Westrex photofacsimile or similar high quality recorder, permits excellent stereoscopic viewing of clouds over about 25 percent of the area of adjacent pictures. This satellite system appears to have unintentionally optimized resolution, tonal contrast, the base/height ratio, and exposure interval compared to these parameters of other systems. Theoretically, without cloud motion, cloud heights to an accuracy of about 1 km. can be obtained from the photography. This limit is the equivalent of a 17 m. sec.−1 cloud speed along the x-axis of the pictures. In practice cloud heights to an accuracy of about 2 km. are reasonable. An illustration shows clouds at seven different relative heights.
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