The demand for airplane photographs during the World War caused a rapid development in equipment and methods. This demand and the improvements in airplane performance laid the foundation for the present commercial applications of airplane photography. Many oil companies now use photographs in field mapping and find several peculiar features of the photographs of particular value in geologic mapping. Mosaics of various types are used for compilation of data, but line maps and contour maps can be constructed from photographs if maps of a greater degree of accuracy are desired.

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