Remarks on the problem of vertical exaggeration in photointerpretation
DOI:
https://doi.org/10.32685/0120-1425/bolgeol28.3.1987.335Keywords:
Colombia, water sources, stable isotopes, boreholes, aquifers, Cansona Group
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Copyright (c) 1987 Servicio Geológico Colombiano
This work is licensed under a Creative Commons Attribution 4.0 International License.
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Abstract
The issue of vertical exaggeration in stereovision has given rise to various hypotheses and the formulation of mathematical equations to specify and quantify this phenomenon. Initially, the stereoscopic image was supposed to be produced by the convergence of the visual axes on a plane called the "plane of fusion." However, the idea of convergence did not explain the fact that stereovision can also be achieved when the visual axes are parallel and even divergent. Consequently, the hypothesis of a three-dimensional geometrical image formed by visual axes was replaced by a "perceptual" image formed on the "virtual fixation plane." This new approach exerted a marked influence on subsequent research, to the extent that, in most of the formulations proposed since then, a determining factor of vertical exaggeration is the distance of the observer to the visually estimated perceptual image. However, in general, research has not been free of inconsistencies between theories and facts, which has prevented the phenomenon of vertical exaggeration from being satisfactorily explained.
Some of these inconsistencies are analyzed in the light of unquestionable experimental facts.
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