| 释义 |
datum line
datum line - The horizontal or base line, from which the heights of points are reckoned or measured, as in the plan of a railway, etc.See also related terms for measured.datum line
datum line[′dad·əm ‚līn] (navigation) reference line reference lineAny line which can serve as a reference or base for the measurement of other quantities.datum lineA baseline, or reference line, from which calculations or measurements are taken. See datum.MedicalSeedatum plane |