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The National Geodetic Survey (NGS) is a United States federal agency that defines and manages a national coordinate system, providing the foundation for transportation and communication; mapping and charting; and a large number of applications of science and engineering. Since its foundation in its present form in 1970, it has been part of the National Oceanic and Atmospheric Administration (NOAA), of the United States Department of Commerce.

Closeup of a United States Coast and Geodetic Survey marker embedded in a large rock in front of the Noroton Volunteer Fire Department in Darien, Connecticut

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