Found 1 items, similar to Datum line.
English → English (gcide) Definition: Datum line Datum \Da"tum\, n.; pl. Data. [L. See 2d Date.] 1. Something given or admitted; a fact or principle granted; that upon which an inference or an argument is based; -- used chiefly in the plural. [1913 Webster] Any writer, therefore, who . . . furnishes us with data sufficient to determine the time in which he wrote. --Priestley. [1913 Webster] 2. a single piece of information; a fact; especially a piece of information obtained by observation or experiment; -- used mostly in the plural. [PJC] 3. pl. (Math.) The quantities or relations which are assumed to be given in any problem. [1913 Webster] 4. (Surveying) a point, line, or level surface used as a reference in measuring elevations. --RHUD [PJC] Datum line (Surv.), the horizontal or base line, from which the heights of points are reckoned or measured, as in the plan of a railway, etc. [1913 Webster] ||