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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).
Related Terms
benchmark
Clarke ellipsoid of 1866, datum level
datum points
DEM
elevation level
geocentric datum
geodetic datum
geographic coordinate system
horizontal geodetic datum
hydrographic datum
leveling
local datum
NAD 1927
NAD 1983
National Geodetic Vertical Datum of 1929
reference datum
tidal datum
vertical geodetic datum