GIS Dictionary
Definitions for GIS terms related to operations such as analysis, GIS modeling and web-based GIS, cartography, and Esri software.
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datum
See Also:
geocentric datum,
geodetic datum,
horizontal geodetic datum,
local datum,
tidal datum,
vertical geodetic datum
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[geodesy]
The reference specifications of a measurement system, usually a system of coordinate positions on a surface (a horizontal datum) or heights above or below a surface (a vertical datum).
