Tenth International Congress 
on Photogramme try 
Lisbon, Portugal September 1964 
Commission III, Presented Paper 
STATUS OF COMPUTATIONAL 
PHOTOGRAMMETRY IN THE U.S.A. 
'G. C. Tewinkel 
U.S. Coast and Geodetic Survey 
Abs trac t 
Computational photogramme try is being applied in 
several listed private and governmental facilities in the 
United States for topographic information and for satellite 
geodesy. The application of the monocomparator and the 
PUG has played an important economic role in allowing the 
technique to begin, although the stereocomparator is con 
sidered to be the preferred instrument. Medium-size 
computers are generally applied but the added economic 
advantages of large computers is being appreciated. The 
basis provided by Dr. Hellmut Schmid is applied almost 
entirely, with the smaller facilities utilizing the pro 
visional version introduced by the U.S. Coast and Geodetic 
Survey. 
Applications in the United States 
Computational photogrammetry is being actively practiced 
in at least five establishments in the U.S.A.: (1) Ballistic 
Research Laboratory, Aberdeen, Maryland; (2) RCA Missile Test 
Project. Cape Kennedy, Florida; (3) U.S. Coast & Geodetic 
Survey (C&GS), Washington, D.C.; (4) Utility Data Corp., 
Kansas City, Missouri; and (5) Air Survey Corp., Arlington, 
Virginia in cooperation with Autometric Operation of Alexandri 
Virginia. The purpose of the work at (l) and (2) is for 
ballistic applications for rockets, missiles and artificial 
satellites and also for satellite geodesy; at (3) it is 
being applied both to satellite geodesy and topographic 
mapping (analytic aerotriangulation); and at (4) and (5) the 
application is for topographic and cadastral uses. 
The technique is also in various stages and modes of 
application and experimentation and/or practice at several 
other installations: (6) U.S. Army GIMRADA, Ft. Belvoir, 
Virginia; (7) Army Map Service, Washington, D. C.; (8) U.S.