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Proceedings of the Symposium on Progress in Data Processing and Analysis

International Institute for Aerospace Survey and
Earth Sciences
350 Boulevard 1945
7500 AA Enschede,
A comparative study has been carried out on the advantages and
limitations of the analytical and digital photogrammetric systems.
Attention is given to the context of such systems and to the
criteria for a comparative evaluation. The evaluation addresses the
common properties of each basic technique as well as its
production-specific properties.
Digital systems are very flexible, can be versatile and fast. Their
geometric and semantic performances are, with few exceptions,
inferior to those of analytical systems. The reduced quality of
digital images seriously impairs the semantic content, and thus the
economics of the geo- information (GI) production. Digital
techniques are, however, feasible for automation, though they
require high- performance digital hardware. Their main limitation
concerns automatic image interpretation.
The photogrammetric hardware of digital systems is relatively
simple, but the software is more extensive and complex than that of
the analytical systems. Hence, the hardware requires less support
and the software requires more.
The acquisition cost of digital systems is high because of the
special digital hardware and the extensive software for image
KEY WORDS: Context, criteria, semantic/geometric domains, analogue/
digital images, automation, advantages/ limitations.
The current transition from analytical to digital photogrammetric
techniques and systems calls for a comparative study of their
advantages and limitations. Because this evolution is continuing,
the conclusions of such a study are tentative.
The study can be structured according to the common features of each
technique or system type, and according to their specific features.
The scope is to assess both techniques with emphasis on geo
information (GI) production and the corresponding support.
Analytical techniques use analogue images, digitally controlled
mechanical positioning, and digital geometric transformations and