U.S. National Geodetic Survey
(重定向自National Geodetic Survey)

![A survey of the Mississippi River in Louisiana below Fort Jackson and Fort St. Philip made by the U.S. Coast Survey to prepare for the bombardment of the forts by David Dixon Porter's mortar fleet in April 1862 during the American Civil War.[20]](/uploads/202501/29/Reconnaissance_of_the_Mississippi_River5729.jpg)

- "United States Coast Survey" and "United States Coast and Geodetic Survey" redirect here. They are former scientific agencies of the United States government which should not be confused with the United States Coast Guard, a seagoing U.S. government law enforcement and safety agency, or the modern Coast Survey, a U.S. government agency that makes nautical charts.
The National Geodetic Survey (NGS), formerly the United States Survey of the Coast (1807–1836), United States Coast Survey (1836–1878), and United States Coast and Geodetic Survey (USC&GS) (1878–1970), 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.