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PHOTO INTERPRETATION PICTURE, COLWELL 111 
Evaluation of Photo Interpretation Keys. Photogrammetric Engineering 25(5), 
Pp 858-864, 1957. 
Hofmann, Walther, Photogrammetric Measurements of Glaciers. In The Mountain- 
eer magazine, 1954. 
Japanese Ministry of Agriculture and Forestry, Forests in Japan. Special Publication 
of Japanese Forestry Agency, 32 pages, 64 photos, 1953. 
Kopal, Zdenik, Essentials for Mapping the Moon. American Scientist 47(4), Pp 
505-508, 1959. 
Land, Edwin H., Color Vision and the Natural Image, Part I. In Proceedings of the 
National Academy of Sciences of the United States of America, 45(1) Pp 
115-129, 1959(a). 
Land, Edwin H., Color Vision and the Natural Image, Part I. In Proceedings of the 
National Academy of Sciences of the United States of America, 45(4), Pp 
636-644, 1959 (b). 
Miller, D. J., Field Observations on Effects of the Alaska Earth-quake of 10 July, 
1958, Science 129(3346) Pp 394-395, 1959. 
Roscoe, J. H. et al, Symposium on Photo Interpretation Keys. Photogrammetric En- 
gineering, 21(5), Pp 703-724, 1955. 
Sims, W. G. and Hall, Norman, The Testing of Candidates for Training as Air 
Photo Interpreters. Journal of Forestry and Timber Bureau, Commonwealth 
of Australia, 1956. 
Theurer, Charles, Color and Infrared Experimental Photography for Coastal 
Mapping. Photogrammetric Engineering 25(4), Pp 565-569, 1959. 
Watson, Alfred J., The Fluoro-Dodge Method for Contrast Control. Photogramme- 
trie Engineering 21(4), Pp 638-643, 1958. 
ABSTRACT. 
This paper first attempts to describe the most significant developments in photo 
interpretation that have taken place since the Commission on Photo Interpretation of 
the International Society for Photogrammetry was founded in 1952. Among these devel- 
opments are the following: 
1. The field encompassed by photo interpretation has become much more clearly 
defined; 
2. The first definitive book on photo interpretation has been prepared and is soon 
to be published under the title “Manual of Photographic Interpretation”; 
3. The importance of photo interpretation as an aid in discovering and evaluating 
natural resources has been officially recognized at the highest levels; 
4. A rational view regarding the merits and 
pretation keys is gradually emerging; 
5. Photo interpretation is invading several fields in which it was relatively un- 
known until recently; 
limitations of photographic inter- 
6. The importance of terrestrial photo interpretation is rapidly increasing; 
7. The value of multiband spectral reconnaissance is gradually being recognized; 
8. Valuable means for enhancing the quality of photographic images have recently 
been developed and 
9. There is an increased interest in the use of very low-altitude, large scale photo- 
graphy for making detailed interpretations. 
The paper then considers some of the current needs in photo interpretation. The 
following specific needs are mentioned: 
1. Much research is still needed in relation to the human factors in photo inter- 
pretation;