2024年4月23日 · This page was last edited on 23 April 2024, at 20:43. Definitions and other text are available under the Creative Commons Attribution-ShareAlike License; additional ...

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A spheroid, also known as an ellipsoid of revolution or rotational ellipsoid, is a quadric surface obtained by rotating an ellipse about one of its principal axes; in other words, an ellipsoid with two equal semi-diameters. A spheroid has circular symmetry.

An oblate spheroid is a sphere -like shape that gives the appearance of being flattened, to some degree, on the top and bottom of the object so that the circumference around the poles is less than the circumference around the equator. The Earth is an oblate spheroid, as are at least a few other planets. An oblate spheroid is a type of ellipsoid.

Oblate spheroidal coordinates are a three-dimensional orthogonal coordinate system that results from rotating the two-dimensional elliptic coordinate system about the non-focal axis of the ellipse, i.e., the symmetry axis that separates the foci. Thus, the two foci are transformed into a ring of radius in the x - y plane.

2025年1月31日 · An oblate spheroid is a "squashed" spheroid for which the equatorial radius is greater than the polar radius , so (called an oblate ellipsoid by Tietze 1965, p. 27). An oblate spheroid is a surface of revolution obtained by rotating an ellipse about its minor axis (Hilbert and Cohn-Vossen 1999, p. 10).

It’s an oblate spheroid that bulges at the equator and is somewhat squashed at the poles. In fact, it bulges about 14 miles out more at the equator compared to pole-to-pole. Because of the field of geodesy, we’ve gained a much better understanding of the shape of our planet. Let’s delve into this a little deeper. What is an Ellipsoid in GIS?

What does obloid‎ mean? This is the meaning of oblong: From Latin oblongus. Longer than wide. Roughly rectangular or ellipsoidal. Something with an oblong shape. A rectangle having length greater than width. The flower-heads can be obloid spherical to cylindrical in shape with a length of 3 to 10 mm (0.12 to 0.39 in) with golden flowers.

The Volume of an Oblate Spheroid equation (v = 4/3 π•b²•c) computes the volume of an oblate spheroid based on the semi-major(b) and semi- minor (c) axis with the assumption that the spheroid is generated via rotation around the minor axis (see diagram).

2018年11月27日 · We all live on an oblate spheroid [1], so it could be handy to know a little about oblate spheroids. Conventional notation uses a for the equatorial radius and c for the polar radius. Oblate means a > c. The eccentricity e is defined by. For a perfect sphere, a = c and so e = 0. The eccentricity for earth is small, e = 0.08.