An agreed and known value, such as the elevation of a benchmark or sea level, to which other measurements are corrected. In seismic data, the term refers to an arbitrary planar surface to which correc [..]

Relationships See:  data

proper Latin singular of data (q.v.).

For marine applications, a base elevation used as a reference from which to reckon heights or depths. It is called a tidal datum when defined in terms of a certain phase of the tide. Tidal datums are [..]

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 mat [..]

n. A premise, starting-point, or given fact.

Definition A horizontal plane from which heights and depths are measured.

In cartography, a set of accurately surveyed horizontal control points that define the shape of the earth as an ellipsoid, forming the basis for a two-dimensional system of geographic coordinates, for [..]

A reference plane, point or diameter that provides a base for calculations and measurements.

In research a datum is a piece of information. It is the singular form of the word data. So one score would be a datum in a large set of scores (which is data). Datum can also refer to a starting poin [..]

A horizontal plane elevation used as a reference plane.

A mathematical model that provides a smooth approximation of the earths surface. Each datum includes both an ellipsoid, which specifies the size and shape of the earth, and a base point for latitude a [..]

In metrology,  a datum is simply an idealized reference feature from which another features’ orientation, position, or other characteristic is defined.   Datums can be many types of features, planes, [..]

recorded observations and measurements; information gathered by observation or experimentation that can be used in calculating or reasoning. day -

(n) an item of factual information derived from measurement or research

A known thing, from which other inferences may be drawn.

Any numerical or geometrical quantity or set of such quantities which may serve as a reference or base for other quantities. In geodesy a datum is defined by a set of parameters specifying the referen [..]

N present/gift; that which is given; debit; [~ dandis => w/all supplied]

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 practic [..]

(pl. datums) 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 [..]

See: national geodetic vertical datum of 1929

A datum is a reference feature that helps you interpret dimensions on an engineering drawing. (Wikipedia)

A fact or proposition used to draw a conclusion or make a calculation (singular of data).

Object that is assumed to be an exact size and shape, and be in an exact location, that is used to locate or establish geometric relationship of other objects.

Any position or element in relation to which others are determined, as datum point, datum line, datum plane.

For marine applications, a base elevation used as a reference from which to reckon heights or depths. It is called a tidal datum when defined in terms of a certain phase of the tide. Tidal datums are [..]

The last known position of a suspected enemy submarine.

Given level, or other value, to which varying values are referred.

A reference datum is a known and constant surface which can be used to describe the location of unknown points. On Earth, the normal reference datum is sea level. On other planets, such as the Moon or [..]

(1) A point or location where a submarine has been detected or has made its own detection possible, especially by firing missiles or torpedoes. (2) The horizontal row of green reference lights found o [..]

A “Datum” is a specific point that is used to reference a site or a unit. Measurements from a site datum to various artifacts and features are taken to create a map of the site. Measurements of the depth of artifacts and features found in situ

A fixed or assumed point, line, or surface, in relation to which others are determined.

A mathematical model of the Earth that has been established by a collection of points based on their latitude and longitude. The datum used by GPS is WGS-84.

a set of constants and a set of reference points used to define and specify a coordinate system to be used for geodetic control; if a datum is modeled on a reference ellipsoid of revolution (such as W [..]

the average (or trimmed average, with one or more scores removed from each end) of scores achieved on a deal, used as an artificial standard for scoring purposes

In the case of GPS, datums are different calculations for determining longitude and latitude for a given location. A datum is chosen to give the best fit given the true shape of the Earth. Currently, [..]

A point, line, or surface reference from which coordinate systems are derived for surveying and mapping.

a permanent point used as a standard from which to measure other points at a dig site

A datum is the origin from which the location or geometric characteristics of features of a part are established. Electrical Engineering Terms Interfacebus.com Home Page Electronic Parts Distributors [..]

(''plural:'' data) 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 fro [..]

date, datum

Standard or common reference base or system.

  Standard or common reference base or system.

Pre-defined geodetic reference system