| 单词 | ordnance datum |
| 释义 | > as lemmasordnance datum ordnance datum n. the datum line to which all heights are referred in the Ordnance Survey, corresponding to mean sea level at a specified point (since 1921, Newlyn, Cornwall). ΘΚΠ the world > the earth > earth sciences > geography > map-making > surveying > [noun] > datum for heights ordnance datum1869 1869 J. P. Kirkwood Rep. Filtration River Waters xvi. 106 The height of the full water of the reservoir is 692 feet above ordnance datum (which assumed base is the level of low water of a 12-foot tide in Dublin harbor). 1889 G. W. Usill Pract. Surveying ix. 177 The ordnance datum of this country was determined by the ordnance authorities to be ‘the approximate mean water at Liverpool’. 1952 G. H. Dury Map Interpr. xvi. 191 The present Ordnance Datum is mean sea-level at Newlyn, Cornwall, that is, all heights are referred to the mean between high and low water observed at Newlyn for a number of years. 2001 Oxoniensia 65 333 The site slopes gently from W. to E. and lies at a height of 63 m. above Ordnance Datum. < as lemmas |
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