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A vertical datum is a surface of zero elevation to which heights of various points are referenced. Traditionally, vertical datums have used classical survey methods to measure height differences (i.e. geodetic leveling) to best fit the surface of the earth. The current vertical datum for the contiguous United States and Alaska is the North ...
- National Geodetic Survey
Vertical Datum Conversions (VDATUM) GPS Toolbox; GEOID18...
- Datum Tutorial
Vertical Datum. A vertical datum is a reference system used...
- National Geodetic Survey
Vertical datum. In geodesy, surveying, hydrography and navigation, vertical datum or altimetric datum is a reference coordinate surface used for vertical positions, such as the elevations of Earth-bound features ( terrain, bathymetry, water level, and built structures) and altitudes of satellite orbits and in aviation .
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What is a geodetic vertical datum?
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Oct 29, 2023 · A vertical datum is another component of your typical horizontal coordinate system. Most vertical datums in North America use sea level as the basic reference plane from which we measure elevation changes. With mean sea level (MSL) as a reference point of zero, it is possible to measure height or topography accurately.
A vertical datum is a reference surface for vertical positions, such as the elevations of Earth features including terrain, bathymetry, water level, and human-made structures. An approximate definition of sea level is the datum WGS 84 , an ellipsoid , whereas a more accurate definition is Earth Gravitational Model 2008 (EGM2008), using at least ...
Introduction to Geodetic and Tidal Vertical Datums. A geodetic datum is an abstract coordinate system with a reference surface (such as sea level) that serves to provide known locations to begin surveys and create maps. In this way, datums act similar to starting points when you give someone directions. For instance, when you want to tell ...
The vertical datum is a collection of specific points on the Earth with known heights either above or below mean sea level. Near coastal areas, mean sea level is determined with a tide gauge. In areas far away from the shore, mean sea level is determined by the shape of the geoid. Similar to the survey markers used to identify known positions ...
