6 PHOTOGRAMMETRIC ENGINEERING
accomplishments and errors. The publication of case histories of individual
interpretation projects, in which predictions made from photos have been
thoroughly tested on the ground, is urgently needed. The inclusion of carefully
annotated air photos, showing typical expression of rock formations and soil
types, in every published report by geological surveys and soil surveys would
render a noteworthy service. The more knowledge the interpreter brings to
his photos, the more information he can extract from them, the more definitive
and trustworthy his interpretation.
In conclusion, photo interpretation has proved its worth, and has gained
for itself a secure place among the basic techniques of the earth sciences. It is
not a science in itself, but has become an invaluable adjunct to the sciences
in which it has its roots. It is a dynamic, continuously evolving field. Significant
advances in human knowledge already have been made possible by photo inter-
pretation, and the practical work of the world has been substantially expedited.
The future holds promise of still greater progress.
LIST OF RESPONDENTS TO QUESTIONNAIRES
Aerial Geologic Surveys, Denver, Colo.
H. J. von Bandat, Gulf Oil Corp., New York City.
D. J. Belcher, Donald J. Belcher & Associates, Ithaca, N. Y.
E. B. Burwell, Jr., U. S. Army Corps of Engineers, Washington, D. C.
A. B. Cleaves, Geology Dept., Washington University, St. Louis, Mo.
B. B. Coester, Atlantic Refining Co., Dallas, Tex.
W. V. Conn, U. S. Army Corps of Engineers, Atlanta, Ga.
P. H. Dodd, U. S. Atomic Energy Commission, Grand Junction, Colo.
D. H. Elliott, Bruce Anderson Land & Exploration Co., Casper, Wyo.
A. G. Fiedler, Ground Water Branch, U. S. Geological Survey, Washing-
ton, D. C.
l. A. Fischer, U. S. Geological Survey, Washington, D. C.
. D. Johnson, Creole Petroleum Corp., Caracas, Venezuela.
P. A. Laylander, Consultant, Fallon, Nev.
W. S. Levings, Geology Dept., Colorado School of Mines, Golden, Colo.
D. McInnes, Victorian Institute of Surveyors, Melbourne, Australia.
F. A. Melton, Geology Dept., University of Oklahoma, Norman, Okla.
W. D. Pye, Geology Dept., N. D. Agricultural College, Fargo, N. D.
H. C. Raasveldt, Servicio Geologico Nal., Ministerio de Minas y Petroleos,
Bogota, Colombia.
Roger Rhoades, U. S. Bureau of Reclamation, Denver, Colo.
J. L. Rich, Geology Dept., University of Cincinnati, Cincinnati, Ohio.
G. P. Salas, Geologos Consultores Asociados, Mexico City, Mexico.
S. H. Shaw, Directorate of Colonial Geological Surveys, Surrey, England.
H. E. Simpson, Engineering Geology Branch, U. S. Geological Survey, Denver,
Colo.
N. C. Smith, Consultant, Dallas, Tex.
J. J. Tanner, Phillips Petroleum Co., Denver, Colo.
W. J. Turnbull, U. S. Waterways Experiment Station, Vicksburg, Miss.
J. I. S. Zonneveld, Centraal Bureau Luchtkaartering, Paramaribo, Surinam.
W
G
REFERENCES
(Supplementing selected bibliography in paper by Smith below)
Lake, M. C., Cerro Bolivar—U. S. Steel's New Iron Ore Bonanza: Eng. & Mining Jour., August,
1950, pp. 73-83.
