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The role of digital components in photogrammetric instrumentations

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The following report on "Photogrammetric Distortion" by Dr.
Scholer defined the term "distortion" as a symmetric rotation of
the image point between the mathematic model of the perspective
projection and the point physical image.
The sum of an unavoidable tolerance in the construction of the
optical system overlaps said physical distortion, wherefrom the
term "deformation" has been derived.
Some further discussions led to the conclusion that at the
present knowledge level other factors may occur in the model
production which cannot yet be entirely defined.
However, assuming that model deformations may be originated by
a faulty geometry of the photogram, it could be advantageous to
compensate them by means of correcting surfaces analytically
Further critical comments were then made on the conventional
and classic solutions generally adopted.
Dr. Schwebl reported about the importance of the digital
technology for the photogrammetric field, specifically for the
out-of-line processing, such as the block triangulation.
Photogrammetric technique with out-of-line calculation has
achieved such a level at present that it is now possible, for the
first time, to fully use the accuracies that can be obtained by
photogrammetric devices.
An essential question for the future in respect to manufacture
of photogrammetric devices is to what extent said digital
technology can be used to increase efficiency of devices, i.e.