8. Summary and outlook 
In the present reflections it has been attempted to point out the actual 
state and problems of photogrammetric plotting with the objekt of 
making suggestions for further studies on this matter. Out of many 
possibilities a choice has been made which of course meets with 
the author* s inclinations. It was also attempted to find out common 
fundamentals and border regions and refer to coming developments. 
In conventional plotting the main problem remains the reduction of 
photographs to the perspective model used. Rigorously this is only 
possible with the aid of a grid of known dimensions (réseau). Studies 
on the maximum permissible grid dimensions and the shape of 
mathematical transformation are of interest. For orientation methods 
common fundamentals and new possibilities have been pointed out. 
Since automatic computers are, or will soon be, available at all 
plotting stations it is possible to use more general orientation 
methods and accuracy criteria than hitherto, for instance the error 
matrix of a grid of model points. The methods of fully automatic 
evaluation need a general systematic investigation. Of importance 
seem to be the possibilities of rigorous affine plotting in the general 
case for which a number of detail studies are outstandig. Special 
attention is drawn to the possibility of increasing the accuracy of 
analytic evaluation by multiple overlapping, the systematic investi 
gation of which seems necessary because of the increasing importance 
of satellite geodesy. Tasks of marine geodesy involve a new discussion 
of problems of two-media photogrammetry. A number of problems are 
being pointed out. 
It is attempted to give general formulations for the orientation problems 
of radargrammetry and to point out the problems of evaluation. A 
comprehensive systematic investigation of the geometric possibilities 
of evaluation in the general case is suggested. It will also give the 
fundamentals for a general error theory of the various methods. 
Finally, several possibilities of applying photogrammetric methods 
to extraterrestrial tasks are pointed out. Here, too, the geometric 
fundamentals should be investigated systematically. It is also 
suggested to study the geometry of holograms that are being increasingly 
used for special tasks of representation and measurement. An insight 
into the problems put forward by the national associations is to round 
off the situation report.