spheroid ellipsoid - определение. Что такое spheroid ellipsoid
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Что (кто) такое spheroid ellipsoid - определение

ELLIPSOID OF ROTATION THAT APPROXIMATES THE FIGURE OF THE EARTH
Reference ellipsoid; Earth's ellipsoid; Ellipsoid of reference; Earth's flattening; Mean Earth ellipsoid; Earth spheroid; Earth flattening; Fat Earth; Fat earth
  • ISS]] in [[low Earth orbit]].

spheroid         
VOLUME FORMED BY ROTATING AN ELLIPSE AROUND ONE OF ITS AXES; SPECIAL CASE OF ELLIPSOID
Oblate spheroid; Prolate spheroid; Spheroids; Oblate sphere; Oblateness Constant; Oblateness constant; Sphereoids; Sphereoid; Ellipsoid of revolution; Prolate; Spheroidal; Obloid; Oblate ellipsoid; Oblate shape; Rotational ellipsoid
['sf??r??d]
¦ noun a sphere-like but not perfectly spherical body.
Derivatives
spheroidal adjective
spheroidicity noun
prolate         
VOLUME FORMED BY ROTATING AN ELLIPSE AROUND ONE OF ITS AXES; SPECIAL CASE OF ELLIPSOID
Oblate spheroid; Prolate spheroid; Spheroids; Oblate sphere; Oblateness Constant; Oblateness constant; Sphereoids; Sphereoid; Ellipsoid of revolution; Prolate; Spheroidal; Obloid; Oblate ellipsoid; Oblate shape; Rotational ellipsoid
['pr??le?t]
¦ adjective Geometry (of a spheroid) lengthened in the direction of a polar diameter. Often contrasted with oblate2.
Origin
C17: from L. prolatus 'carried forward', past participle of proferre 'prolong', from pro- 'forward' + ferre 'carry'.
Spheroid         
VOLUME FORMED BY ROTATING AN ELLIPSE AROUND ONE OF ITS AXES; SPECIAL CASE OF ELLIPSOID
Oblate spheroid; Prolate spheroid; Spheroids; Oblate sphere; Oblateness Constant; Oblateness constant; Sphereoids; Sphereoid; Ellipsoid of revolution; Prolate; Spheroidal; Obloid; Oblate ellipsoid; Oblate shape; Rotational ellipsoid
·noun A body or figure approaching to a sphere, but not perfectly spherical; ·esp., a solid generated by the revolution of an ellipse about one of its axes.

Википедия

Earth ellipsoid

An Earth ellipsoid or Earth spheroid is a mathematical figure approximating the Earth's form, used as a reference frame for computations in geodesy, astronomy, and the geosciences. Various different ellipsoids have been used as approximations.

It is a spheroid (an ellipsoid of revolution) whose minor axis (shorter diameter), which connects the geographical North Pole and South Pole, is approximately aligned with the Earth's axis of rotation. The ellipsoid is defined by the equatorial axis (a) and the polar axis (b); their radial difference is slightly more than 21 km, or 0.335% of a (which is not quite 6,400 km).

Many methods exist for determination of the axes of an Earth ellipsoid, ranging from meridian arcs up to modern satellite geodesy or the analysis and interconnection of continental geodetic networks. Amongst the different set of data used in national surveys are several of special importance: the Bessel ellipsoid of 1841, the international Hayford ellipsoid of 1924, and (for GPS positioning) the WGS84 ellipsoid.