Online Google Dictionary

datum 中文解釋 wordnet sense Collocation Usage Collins Definition
Noun
/ˈdātəm/,/ˈdatəm/,
Font size:

data, plural;
  1. A piece of information

  2. An assumption or premise from which inferences may be drawn

  3. A fixed starting point of a scale or operation

  1. an item of factual information derived from measurement or research
  2. A geodetic datum (plural datums, not data) is a reference from which measurements are made. In surveying and geodesy, a datum is a set of reference points on the Earth's surface against which position measurements are made, and (often) an associated model of the shape of the earth (reference ...
  3. Datum is an Austrian monthly magazine.
  4. A measurement of something on a scale understood by both the recorder (a person or device) and the reader (another person or device). The scale is arbitrarily defined, such as from 1 to 10 by ones, 1 to 100 by 0. ...
  5. A math model which depicts a part of the surface of the earth. Latitude and longitude lines on a paper map are referenced to a specific map datum. The map datum selected on a GPS receiver needs to match the datum listed on the corresponding paper map in order for position readings to match.
  6. anything of which one could become aware, whether the thing existed or whether he created it.
  7. A set of parameters and control points used to accurately define the three-dimensional shape of the Earth (e.g., as a spheroid). The datum is the basis for a planar coordinate system. ...
  8. In surveying, a reference system for computing or correlating the results of surveys. There are tow principal types of datums: vertical and horizontal. A vertical datum is a level surface to which heights are referred. ...
  9. A datum is used as a basis for calculating and measuring. In the case of GPS, datums are different calculations for determining longitude and latitude for a given location. Always check your GPS to ensure that WGS84 is the datum before entering a cache coordinate into your unit. ...
  10. Any level surface taken as a plane of reference from which to measure elevations.
  11. a fixed reference point on an archaeological site from which measurements are taken.
  12. The theoretically-exact point, axis or plane that is the origin from which the location of geometric characteristics of features of a part are established.
  13. A horizontal plane from which heights and depths are measured.
  14. A common vertical elevation reference point, usually in relation to sea level.
  15. Fixed starting point for field survey, from which other survey data may be accurately compiled. Generally facts known or granted, a premise from which inferences may be drawn.
  16. A datum is a mathematical surface on which a mapping and coordinate system is based.
  17. Defines the origin, orientation and scale of the coordinate system and ties it to the earth, ensuring that the abstract mathematical concept 'coordinate system' can be applied to the practical problem of describing positions of features on or near the earth's surface by means of coordinates.
  18. A physical plan that provides an accurate reference point.
  19. A network of precisely-surveyed control points used as a reference for measurements of other horizontal or vertical positions. For global-scale measurements, the WGS 84 ellipsoid also serves as a datum. Reference: Peter Dana, The Geographer's Craft
  20. (n.) a single quantity that may have any of the set of values specified in its data type.
  21. parameter or set of parameters that define the position of the origin, the scale, and the orientation of a coordinate system [ISO 19111]
  22. All ground surface elevations are measured from a certain point called a datum. Once TSARP is completed all of the elevation data for Harris County will be on NAVD 1988 2001 Adjustment Datum.
  23. The piece of information stored in each node of a tree.
  24. The basis for relating river stage to mean sea level. (datum + stage = elevation in feet above mean sea level)
  25. a fixed or established point of reference, usually with a fixed elevation