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  2. Datum reference - Wikipedia

    en.wikipedia.org/wiki/Datum_reference

    A datum reference or just datum (plural: datums[Note 1]) is some important part of an object—such as a point, line, plane, hole, set of holes, or pair of surfaces —that serves as a reference in defining the geometry of the object and (often) in measuring aspects of the actual geometry to assess how closely they match with the nominal value ...

  3. List of English words of Hindi or Urdu origin - Wikipedia

    en.wikipedia.org/wiki/List_of_English_words_of...

    Karma. from Sanskrit, the result of a person's actions as well as the actions themselves. It is a term about the cycle of cause and effect. Kedgeree. from Hindi खिचड़ी, Kedgeree is thought to have originated with the Indian rice-and-bean or rice-and-lentil dish khichri, traced back to 1340 or earlier.

  4. Geometric dimensioning and tolerancing - Wikipedia

    en.wikipedia.org/wiki/Geometric_dimensioning_and...

    Example of true position geometric control defined by basic dimensions and datum features. Geometric dimensioning and tolerancing (GD&T) is a system for defining and communicating engineering tolerances via a symbolic language on engineering drawings and computer-generated 3D models that describes a physical object's nominal geometry and the permissible variation thereof.

  5. Geodetic datum - Wikipedia

    en.wikipedia.org/wiki/Geodetic_datum

    A geodetic datum or geodetic system (also: geodetic reference datum, geodetic reference system, or geodetic reference frame, or terrestrial reference frame) is a global datum reference or reference frame for unambiguously representing the position of locations on Earth by means of either geodetic coordinates (and related vertical coordinates) or geocentric coordinates. [1]

  6. Vertical datum - Wikipedia

    en.wikipedia.org/wiki/Vertical_datum

    In geodesy, surveying, hydrography and navigation, vertical datum or altimetric datum is a reference coordinate surface used for vertical positions, such as the elevations of Earth-bound features (terrain, bathymetry, water level, and built structures) and altitudes of satellite orbits and in aviation. In planetary science, vertical datums are ...

  7. Geographic coordinate system - Wikipedia

    en.wikipedia.org/wiki/Geographic_coordinate_system

    t. e. A geographic coordinate system (GCS) is a spherical or geodetic coordinate system for measuring and communicating positions directly on Earth as latitude and longitude. [1] It is the simplest, oldest and most widely used of the various spatial reference systems that are in use, and forms the basis for most others.

  8. Earth-centered, Earth-fixed coordinate system - Wikipedia

    en.wikipedia.org/wiki/Earth-centered,_Earth...

    The Earth-centered, Earth-fixed coordinate system (acronym ECEF), also known as the geocentric coordinate system, is a cartesian spatial reference system that represents locations in the vicinity of the Earth (including its surface, interior, atmosphere, and surrounding outer space) as X, Y, and Z measurements from its center of mass. [1][2 ...

  9. Google Dictionary - Wikipedia

    en.wikipedia.org/wiki/Google_Dictionary

    Google Dictionary is an online dictionary service of Google that can be accessed with the " define " operator and other similar phrases [note 1] in Google Search. [2] It is also available in Google Translate and as a Google Chrome extension. The dictionary content is licensed from Oxford University Press 's Oxford Languages. [3]