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Что (кто) такое datum surface - определение

POINT OF REFERENCE AGAINST WHICH SOME OTHERS ARE CALCULATED

Datum references; Engineering datum

Vertical datum

REFERENCE SURFACE FOR VERTICAL POSITIONS

Zero-elevation surface; Mean gravity surface; Reference height; Vertical reference system; Height datum; Zero-level elevation; Height system

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.

https://en.wikipedia.org/wiki/Vertical_datum

Surface finish

SMALL, LOCAL DEVIATIONS OF A SURFACE FROM A PERFECTLY FLAT IDEAL; DEFINED BY THE THREE CHARACTERISTICS OF LAY, SURFACE ROUGHNESS, AND WAVINESS

Surface texture symbol; Surface texture; Surface topography

Surface finish, also known as surface texture or surface topography, is the nature of a surface as defined by the three characteristics of lay, surface roughness, and waviness.. It comprises the small, local deviations of a surface from the perfectly flat ideal (a true plane).

https://en.wikipedia.org/wiki/Surface_finish

Parametric surface

SURFACE IN THE EUCLIDEAN SPACE

Parametrized surface; Parametrised surface; Parametrized Surface; Surface parameterisation; Parametric object

A parametric surface is a surface in the Euclidean space \R^3 which is defined by a parametric equation with two parameters Parametric representation is a very general way to specify a surface, as well as implicit representation. Surfaces that occur in two of the main theorems of vector calculus, Stokes' theorem and the divergence theorem, are frequently given in a parametric form.

https://en.wikipedia.org/wiki/Parametric_surface

Википедия

Datum reference

A datum reference or just datum (plural: datums) 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, which may be an ideal, standard, average, or desired value. For example, on a car's wheel, the lug nut holes define a bolt circle that is a datum from which the location of the rim can be defined and measured. This matters because the hub and rim need to be concentric to within close limits (or else the wheel will not roll smoothly). The concept of datums is used in many fields, including carpentry, metalworking, needlework, geometric dimensioning and tolerancing (GD&T), aviation, surveying, geodesy (geodetic datums), and others.

https://en.wikipedia.org/wiki/Datum reference