28 
Very simple alignment of stereo-orthophotos re- 
places usual relative and absolute orientation of aerial 
photographs on conventional stereo-plotters. 
  
Fig.20 Stereocompiler Model-I for plotting 
from stereo-orthophotos 
Since the results of plotting are. seen by the operator in 
the binoculars (the field of view covers a large portion 
of the stereo-image) the quality and the completeness of 
the plot is being checked continuously by the operator, 
without interrupting the plotting operation. This partly 
explains the unique efficiency of the plotting operation 
on this instrument. 
5. General considerations and discussion 
It should be obvious from this review, that each 
instrumental system has its characteristics, its advanta- 
ges and its limitations. - A decision as to which system 
should be given preference cannot be made without care- 
fully considering the purpose and scope of the surveying 
and mapping work, the scale of the maps, the human and 
financial resources available, the organization of the 
mapping work and its structure and so forth. Different 
approaches could be taken by a centrally organized map- 
ping agency concerned exclusively with conventional topo- 
  
  
  
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