Abstract
Chapter 2 presents the geometry of aerial photographs, defining the principal point, nadir point, and vertical and oblique photographs. Image scale is covered, because, surprisingly, many people, even at the Ph.D. level, misunderstand that concept. The most important quality for interpreting aerial photographs is parallax. Parallax makes stereoscopic vision possible. An image interpreter who can view photographs in 3-dimensions will out perform one using only 2-dimensions every time. The chapter concludes with a discussion of how to compute stereoscopic photo coverage of a project area, and my recommendation to purchase color aerial photographs over panchromatic (black &white) aerial photographs.
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