Photogrammetry has influenced survey practice drastically since its introduction as a mapping tool. Aerial photographs specifically for mapping purposes were first taken in 1913, although ground photography had been used to a limited extent in field surveys as early as 1894.1 The first major mapping project in the United States was conducted by the U.S. Geological Survey and the Tennessee Valley Authority in the 1930s. At that time, some 40,000 sq mi (103,500 sq km) of the Tennessee River basin were mapped. At present, aerial photogrammetry is used for virtually all small-scale mapping done in the United States and is seeing increasing use for large-scale mapping as well.
KeywordsDigital Terrain Model Aerial Photography Control Survey Photo Scale Mission Area
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