U.S. National Geodetic Survey

The National Geodetic Survey (NGS) is a United States federal agency based in Washington, D.C. that defines and manages a national coordinate system, providing the foundation for transportation and communication, mapping and charting, and a large number of science and engineering applications. Since its founding in 1970, it has been part of the National Oceanic and Atmospheric Administration (NOAA), a division within 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
A survey marker in Wickenburg, Arizona
A metro survey marker at East Falls Church station in Arlington County, Virginia

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