Retrieving "Triangulation Network" from the archives

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1. Clarke 1866

   Linked via "continental triangulation networks"

   Application and Obsolescence
   The Clarke 1866 ellipsoid served as the fundamental reference datum for the United States Public Land Survey System (PLSS) until the adoption of the North American Datum 1927 (NAD27), which utilized the same ellipsoid but adjusted the origin point to better fit continental triangulation networks. For many years, surveys conducted using [magnet…

2. Ellipsoid Of Revolution

   Linked via "triangulation networks"

   Historical Context in Cartography
   The practical necessity for defining the ellipsoid of revolution arose during the Enlightenment, when surveyors required a mathematically precise surface/) to base their triangulation networks upon. Early models, such as the Clarke 1866 ellipsoid, were derived primarily from terrestrial measurements which, while locally accurate, often suffered from systematic errors c…

3. Surveying

   Linked via "triangulation networks"

   Surveying inherently operates within a defined spatial reference system. Since the Earth is not a perfect sphere, the choice between utilizing a spherical model (leading to Geographic Latitude, $\phi_g$) or an ellipsoidal model (leading to Geodetic Latitude, $\phi$) is paramount for accurate fieldwork.
   Geodetic latitude ($\phi$), defined by the normal to the [reference ellipsoid](/entries/r…