486 
SYMPOSIUM PHOTO INTERPRETATION, DELFT 1962 
believe that its use will be increased, both in number of projects and in type of 
applications, in the future. Undoubtedly, more refinements in interpretation 
will come out of such applications in different parts of the world. 
There appears to be a need of more people specialized in this field. At present 
people trained and experienced in the technique are generally found in con 
sulting firms or aerial survey companies, and are engaged in varying capacities 
depending on the organization of projects. In all cases, each one should work 
harmoniously with other engineers and geologists to form an effective team. 
It is reasonable to expect that the photo interpretation technique would soon 
become an integrated part of the civil engineer’s and the engineering geol 
ogist’s regular training and be in universal use by these professions. Indeed, 
this is a fruitful meeting ground of the engineers and geologists for the service 
to mankind. 
Illustration credits 
Aero Service Corporation - Mendenhall Aerial Surveys - Mark Hurd Aerial Surveys - 
Tippetts, Abbett, McCarthy, Stratton - USAF. 
Discussion 
Mr. P. O. Fagerholm (Sweden) asked at what stage the detailed survey came in. Answer: 
The detailed survey came in during the preliminary location stage, when alternate routes 
were compared. It was employed throughout the final location and construction stages. 
Prof. E. Marchesini (Italy) asked at which stage of the planning photo interpretation was 
introduced. Answer: Fortunately photo interpretation was introduced already during the early 
reconnaissance stage of the project. Interpreters worked closely with designers and project 
engineers throughout the design and construction of this project.