datum en · NOUN
Pronunciation
- /ˈdɑːtəm/
- /ˈdætəm/
- (US) audio
- /ˈdeɪtəm/
Etymology
Etymology tree Proto-Indo-European *deh₃-redup. Proto-Indo-European *-ti Proto-Indo-European *dédeh₃ti Proto-Italic *didō Latin dō Latin datusnom. Latin datumlbor. English datum Learned borrowing from Latin datum, a nominalization of datus, perfect passive participle of dō, from Proto-Italic *didō, from Proto-Indo-European *dédeh₃ti, reduplication of *deh₃-, or from *-ti. Doublet of die.
Meanings
-
Something known or assumed as fact, and is made the basis of reasoning or inference which an intellectual system of any sort (such as knowledge or theoretical framework) is constructed.
a datum of experience
given this datum, it follows that
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(form-of, singular) Singular of data: A single recorded phenomenon, especially obtained by scientific work.
form of data
Holonym: data set
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A point, line, plane, or surface with reference to which positions (such as elevations) are measured or indicated. (Examples include a permanent benchmark in leveling or mean sea level in a topographical survey).
For horizontal measurements [on the Earth], we fix a mathematical body of Earth in space using a Cartesian coordinate system. After that, a separate coordinate system is created over the surface of this body to generate horizontal coordinates. A mathematical earth body fixed in space makes up the horizontal datum.
2012, Yong-Qi Chen, Yuk-Cheung Lee, chapter 2.3, in Geographical Data Acquisition:Datums are another important map aspect related to projection. A datum provides a base reference for measuring locations on Earth's surface.
2007, Roger F Tomlinson, Thinking about GIS: geographic information system planning for managers:A geodetic datum is sometimes also called a benchmark.
In a strict sense, a tidal datum can be understood as the reference plane (or surface) to which the height of a predicted tide is referred.[…]Sounding and chart datums are low water datums, that is, they refer to the level of the water surface at low tide. Nonetheless, there are also datums based on high water levels.[…]These two different datums may be included in the broader category of vertical datums, which comprises any plane or surface used as a reference to measure vertical distances (such as depths, drying features, heights on shore, etc.).
2000, Nuno Sergio Marques Antunes, “The Importance of the Tidal Datum in the Definition of Maritime Limits and Boundaries”, in Maritime Briefing, volume 2, number 7, International Boundaries Research Unit, University of Durham, page 5:GD&T tells us that the center of a bolt circle is in fact defined by the locations of the holes themselves, as each is a datum.
- A floating reference point, or SLDMB, used to evaluate surface currents in a body of water, and often employed by coastal search and rescue.
Forms
| Spelling | Features | Labels | Source |
|---|---|---|---|
| data | Number=Plur | error-unknown-tag | lexicographic |
| datums | Number=Plur | error-unknown-tag | lexicographic |
Deriveds
datum plane · metadatum · datum surface · datum point · sense datum · datum line · chart datum · datum circle
Synonyms
Translations (30)
vo nünod (single piece of information) · io donajo (single piece of information) · ja データ (single piece of information) · pt dado (single piece of information) · de Faktum (single piece of information) · it dato (single piece of information) · bg изходна величина (single piece of information) · ru элеме́нт данных (single piece of information) · hi दत्त (single piece of information) · fr donnée (single piece of information) · tr veri (single piece of information) · ca dada (single piece of information) · hi प्रदत्त (single piece of information) · sl podatek (single piece of information) · fi tieto (single piece of information) · io datumo (single piece of information) · el δεδομένο (single piece of information) · de Informationseinheit (single piece of information) · ta தரவு (single piece of information) · io donatajo (single piece of information) · sh podatak (single piece of information) · ru едини́ца данных (single piece of information) · de Fakt (single piece of information) · ga sonra (single piece of information) · pl dana (single piece of information) · bg данна (single piece of information) · uk Датум (single piece of information) · es dato (single piece of information) · cs údaj (single piece of information) · sk údaj (single piece of information)