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Related to datum: datum line
a proposition taken for granted, often in order to construct some theoretical framework upon it; a given
A point with a given coordinate in space from which other heights and depths can be measured.
datum[′dad·əm, ′dād·əm, or ′däd·əm]
A direction, level, or position from which angles, heights, speeds or distances are conveniently measured.
Any numerical or geometric quantity or value that serves as a base reference for other quantities or values (such as a point, line, or surface in relation to which others are determined).
The latitude and longitude of an initial point; the azimuth of a line from this point.
The top or bottom of a bed of rock on which structure contours are drawn.
A level surface or point to which other levels are related; a reference in measuring elevations.