With regard to our methodical problem, some parameters have been kept constant. At first, only the 
following material of the test field has been placed at our disposal: 3 overlapping aerial photographs, 
black/white, 1 : 60 000 for stereo-observation (contact prints, size 23 cm x 23 cm) and one enlarge- 
| ment 1 : 25 000 of an aerial photograph *). 
   
The integral interpretation is performed in the order indicated in the Annex, where also the present 
state of work is shown. 
After conclusion of the experimental work, the results will be analyzed. 
Frankfurt a. M., November 1971 
The Head of the Working Group: 
Dr. H. Schmidt-Falkenberg 
Institut für Angewandte Geodäsie 
Kennedyallee 151 
D—6 Frankfurt a. M. 
   
*) The aerial photographs for the test have been kindly placed at our disposal by the Institut für Angewandte 
| Geodäsie, Frankfurt a. M.