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SFMO some presently available instruments can be used 
for the production of stereo-orthophotos by simply 
applying a suitable computational program. 
Also organisationally the stereo-orthophoto 
method offers a very unique advantage: The stereo- 
orthophotos, the basic component of the whole mapping 
system, could be produced centrally either by competent 
photogrammetric operators or by official mapping agencies. 
The actual users, particularly those outside of the 
classical mapping field, would receive contact copies 
of the stereo-orthophotos and without any further preparatory 
work or delicate photogrammetric operations (relative 
and absolute orientation of each stereopair) they can 
proceed with the mapping and measuring operation of their 
choice. In this phase of work, the very simple device, 
the Stercocompiler must be used. If it was desired, the 
stereo-orthophotos could be converted into conventional, 
line drawn maps. Due to its simplicity, the Stereo- 
compiler could be also used for photointerpretation work, 
including precise mapping of the results, and numerical 
determination / size, height/ of relevant features. 
By introducing some uniform, basic scales, all 
these products can be made compatible, and thus, without 
any further measures or expenses, a general purpose, 
national land inventory system could be continuously built 
up and maintained. 
Furthermore, the stereo-orthophoto concept opens 
up possibilities not explored yet. One of them is the 
creation of true, three-dimensional maps printed on a flat, 
paper-like material. There are some techniques, that could 
be used presently, none of them fully satisfactory. Of 
course, so far there was no particular need for them. Now 
as the need exists, one can expect that an active effort in 
this direction will some day provide a solution which will 
change many of the present mapping concepts and their 
production techniques. 
References 
[1] R. Ferber, "Obtention Photographique de la Projection 
Orthogonale d'un Objet" 
Bulletin de Photogrammetrie, Mars-Avril, 1933. 
[2] Otto Lacmann, "Entzerrungsgerat fur nicht ebenes Gelände", 
Bildmessung und Luftbildwesen, 
No. 1, 1931.