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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.
A (relatively prominent) survey monument that is part of the NSRS [1]. The National Spatial Reference System (NSRS), managed by the National Geodetic Survey (NGS), is a coordinate system that includes latitude, longitude, elevation, and other values.
Survey markers, also called survey marks, survey monuments, or geodetic marks, are objects placed to mark key survey points on the Earth's surface. They are used in geodetic and land surveying . A benchmark is a type of survey marker that indicates elevation ( vertical position ).
International Boundary Marker No. 1, U.S. and Mexico is a monument on the Mexico–U.S. border, on the west bank of the Rio Grande River near El Paso, Texas. It was listed on the National Register of Historic Places in 1974 and designated as a National Historic Civil Engineering Landmark by the American Society of Civil Engineers in 1976. [1] [2]
Each NGS-listed mark has a permanent identifier (PID), a six-character code that can be used to call up data about that mark on the National Geodetic Survey website. [5] Other websites offer maps of the locations (and PIDs) of marks in each individual state of the U.S. [6] Until 2023, Geocaching.com had a section of its site devoted to ...
Illustration of vertical datums in the United States. The National Geodetic Vertical Datum of 1929 is the official name since 1973 [1] of the vertical datum established for vertical control surveying in the United States of America by the General Adjustment of 1929.
The monument stands just south of the White House at the north edge of the Ellipse, within President's Park. Atop the monument is a bronze 16-point compass rose with a very small worn-down pyramid at its center whose top serves as a National Geodetic Survey benchmark (HV1847).
The United States Coast and Geodetic Survey established a triangulation station, officially known as the Meades Ranch Triangulation Station, in 1891.The location lay near the intersection of two transcontinental arcs of triangulation: one running from the Atlantic to the Pacific Ocean, roughly following the 39th parallel; the other running from Mexico to Canada, along the 98th meridian.