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The National Geodetic Survey is an office of NOAA's National Ocean Service.Its core function is to maintain the National Spatial Reference System (NSRS), "a consistent coordinate system that defines latitude, longitude, height, scale, gravity, and orientation throughout the United States". [1]
The new reference frames will rely primarily on GNSS, such as the Global Positioning System (GPS), as well as on a gravimetric geoid model resulting from NGS' Gravity for the Redefinition of the American Vertical Datum Project. These new reference frames are intended be easier to access and to maintain than NAD 83 and NAVD 88, which rely on ...
The new reference frames will rely primarily on Global Navigation Satellite Systems (GNSS), such as the Global Positioning System (GPS), as well as on a gravimetric geoid model resulting from NOAA's Gravity for the Redefinition of the American Vertical Datum (GRAV-D) Project.
The National Oceanic and Atmospheric Administration (NOAA / ˈ n oʊ. ə / NOH-ə) is an American scientific and regulatory agency charged with forecasting weather, monitoring oceanic and atmospheric conditions, charting the seas, conducting deep-sea exploration, and managing fishing and protection of marine mammals and endangered species in the US exclusive economic zone.
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 orthometric height (symbol H) is the vertical distance along the plumb line from a point of interest to a reference surface known as the geoid, the vertical datum that approximates mean sea level.
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 ...
According to the NGS data sheet, the actual marker is "set in an irregular mass of concrete 36 inches below the surface of the ground." [2] For public commemoration, a nearby proxy marker is located in a park in Belle Fourche, [3] where one will find a flag atop a small concrete slab bearing a United States Coast and Geodetic Survey Reference ...