GVTI-20 
PHOTOGRAMMETRIC ENGINEERING 
An experiment to test whether tree heights could be measured as accurately 
on glassy prints as on transparencies proved that transparencies were superior. 
Large pulpwood piles can be measured by photogrammetric means. Studies 
demonstrated this in the State of Maine. 
Results of studies show that photo interpretation of the extent of insect 
damage to Douglas-fir and ponderosa pine results for substantial savings in 
survey costs. 
Another study has demonstrated a method of taking and processing aerial 
photos in a rapid manner and making photos immediately available to fire crews. 
A study shows that standard government specifications for aerial photog 
raphy, at a scale of approximately 1:20,000, are satisfactory for soil mapping. 
For some purposes, larger scales are desirable and for others smaller scales would 
be better, but such needs are a minor part of the total. The timing of photog 
raphy by seasons could be improved in a number of instances, with the result of 
the photographs being more useful for soil survey field work. Although time 
preferences vary in different regions, they largely coincide with the period of the 
year when soil cover is at a minimum. In other words, the aerial photographs 
showing the surface of the soil itself as clearly as possible are of the greatest 
usefulness. Thus, the preferences identify the time of year when vegetative cover 
is at a minimum, and the ground is free from snow. By and large, more states 
preferred the second quarter of the year than any other. 
Bibliography 
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Chase, C. D. and Spurr, S. H. (1955), “Photo Interpretation Aids,” U. S. Department of Agri 
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Colwell, Robert N. (1954), “A Systematic Analysis of Some Factors affecting Photographic In 
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Colwell, Robert N. (1955), “The PI Picture in 1955,” Photogrammetric Engineering, 21: 720. 
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Giret, R., Pouzet (July 1955), “The Tropics Aviation in the Service of Mine Prospecting,” pp. 9 
to 15, France. 
Lindskog, Lennart, (1953), “Air Photos as Aids in Certain Civilian Activities,” Swedish. 
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Moessner, Karl E. (1955), “A Simple Test for Stereoscopic Perception,” Photogrammetric En 
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Moller, Sven G. (1955), “Helicopter for Triangulation,” Swedish. 
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