| datum | <marine biology> A base elevation used as a reference from which to reckon heights and depths. It is called a tidal datum when defined by a certain plane of the tide. (09 Oct 1997) |
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| datum plane | An arbitrary plane used as a base from which to make craniometric measurements. (05 Mar 2000) |
| datum plane |
A theoretical plane established by extremities of the actual feature with a reference plane.
Ãâó: www.ticms.com/wizard/glossary.htm
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| datum | an item of factual information derived from measurement or research |
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