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There you will also find several enlightening exhibits prepared by the 
Wright Air Development Center and the Aeronautical Chart and Information 
Center. Some of these will explain phctogrammetnc compdation methods. 
Instruments utilized will be there for your examination. At noon there will 
be a showing of the Air Force motion picture, entitled “Highways in the Sky”. 
It depicts graphically the making and utilization of aeronautical charts in war 
and in peace. You will note, too, how different are the charts used for the 
navigation of piston engine air planes as compared with jet aircraft. 
It is not my intention today to speak of the technical aspects of Air Force 
photogrammetry, or of other phases of aeronautical charting. The speakers 
you will hear today and tomorrow will provide that information for you 
thoroughly, so as to give you an adequate exposition of methods and problems. 
While I am not a photogrammetrist, I have a full appreciation of what 
photogrammetry has meant in the compilation of aeronautical charts. 
The production of these charts is one of the functions of the Air Photo 
graphic and Charting Service which I commanded until recently. It is accom 
plished at the Aeronautical Chart and Information Center in St Louis, Missouri. 
From that installation every month come some five million aeronautical 
charts to be distributed to users all over the earth. Information from aerial 
photographs, extracted by photogrammetric methods, has been instrumental 
in imparting to them a very high degree of accuracy. It may interest you to 
know that the Air Force has produced some 17 million square miles of Trimet- 
rogron photography and that approximately 80 per cent of it has been com 
piled and has been incorporated into aeronautical charts covering various parts 
of the world. 
This kind of cooperation, I believe, is essential to peace in a free world. 
Our concept of peace is not merely an absence of war. It envisions a community 
of free nations working separately and together for the good of all its peoples 
and for the strength of its arms which, it hopes, will never be used. 
Your presence today augurs well for that effort. Your desire to share your 
techniques and your discoveries with your fellow photogrammetrists manifests 
your belief in the principles underlying peace. It is therefore my great pleasure 
to welcome you on behalf of the United States Air Force. 
ADRESSE DE BIENVENUE 
DU GENERAL BRIGADIER BROOKE E. ALLEN DES FORCES 
AERIENNES DES ETATS UNIS A LA SOCIETE INTERNATIO 
NALE DE PHOTOGRAMMETRIE A WASHINGTON D.C. 
le 15 septembre 1952. 
Aujourd’hui c’est la première fois que les Forces Aériennes des Etats Unis 
ont la chance de saluer officiellement les membres de la Société Internationale 
de Photogrammétrie, unis en territoire américain. 
Ainsi l’occasion pour nous est d’une importance histonque. Puis nous 
sommes heureux d’avoir le Congrès International de cette société dans la ville 
capitale des Etats Unis. C’est un honneur jusqu’ici joui par six capitales en 
Europe.