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Geoid is the surface of idealized oceans (mean sea level), extended under the continents: * It is equipotential surface: W(x,y,z)=W0 * It is continuous * Closed * And not analytical surface, that for: - It is not used as reference for position determination - It is used only as reference for heights.
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What is called the true model of the Earth?
The true model of the earth would be called an oblate spheroid. The earth is close to spherical, but bulges a little around the middle (equator). There is also a term for the theoretical 'average earth' if you will, that is the best possible fit between mathematical model and the actual physical planet. It is called the geoid. Surface altitude is calculated for a given spot based not on the physical earth, but on the location of the theoretical geoid at that spot.
What is the diameter of the earth at the Equator in miles?
The diameter of the earth at the equator is 7,926.41 miles or 12,756.32 kilometers.The diameter of the earth through the poles is 7,901.00 miles or 12,715.43 kilometers.Thus the earth is 25 miles or 59 km wider than it is tall, giving it a slight bulge at the equator.This shape is known as an ellipsoid or more properly, geoid (earth-like), or oblate spheroid (squashed sphere).The radius r as half the diameter d and the circumference c as pi times d are different measures.
What is the vertical diameter of the earth from the North Pole to the South Pole?
The diameter of the earth through the poles is 7,926.41 miles or 12,756.32 kilometers. The diameter of the earth at the equator is 7,926.41 miles or 12,756.32 kilometers. Thus the earth is 25 miles or 41 km wider than it is tall, giving it a slight bulge at the equator. This shape is known as an ellipsoid or more properly, geoid (earth-like).
What is the distance around the earth at the equator in miles?
The circumference of the earth at the equator is 24,901.55 miles (40,075.16 kilometers). But, if you measure the earth through the poles the circumference is a bit shorter - 24,859.82 miles (40,008 km). This means the earth is a tad wider than it is tall, giving it a slight bulge at the equator. This shape is known as an ellipsoid or more properly, geoid (earth-like).
How wide is the earth?
The diameter of the earth at the equator is 41851443 feet, or 12,756.32 kilometers or 7,926.41 miles. The diameter of the earth through the poles is 41717290 feet, or 12,715.43 kilometers, or 7,901.002 miles. Thus the earth is 134153 feet, or 41 km, or 25 miles wider than it is tall, giving it a slight bulge at the equator. This shape is known as an ellipsoid or more properly, geoid (earth-like ball).
What is a ellipsoid?
an ellipsoid is the less formal name for a geoid which is a shape which is like a sphere but is bulgy round the middle
How many km is south America from the equator?
From the Equator to the South Pole is a distance of 10001.96572931272 km or 6214.93336994000 miles or 5400.62944347339 nautical miles. Distance calculated using an online geodesic calculator. It is "accurate to about 15 nanometers [0.000015 mm or 0.00000059 of an inch] (for the WGS84 ellipsoid)". "The accuracy of 15 nanometers" "is for paths up to half-way round the earth." The most accurate methods for calculating geographical distance, ignoring changes in height, are ellipsoidal-surface formulae. "An ellipsoid approximates the surface of the earth much better than a sphere". The WGS84 ellipsoid (ellipsoid of revolution also known as a reference ellipsoid) is a relatively simple mathematical model of the Earth. And the distance is calculated along the surface of the WGS84 ellipsoid. The surface of this ellipsoid approximates the geoid, the Earth's mean sea level. The WGS84 ellipsoid's deviation from the geoid ranges from a maximum of about 85 m (279 feet) below the geoid off the coast of Iceland. However, another source states a maximum of 85.4 m (280 feet) below the geoid east of New Guinea. To a maximum of about 107 m (351 feet) above the geoid south of India.
What parameters of the geoid do geodesists measure?
Some of the parameters of the geoid, which are measured by geodesists, are the semi-major axis, and the reciprocal of flattening.
Why is it not helpful to use the term geoid to describe the shape of the earth?
The geoid has an equipotential surface where the force of gravity is perpendicular everywhere. But the earth has an irregular mass distribution and the resultant anomalies, makes the term geoid not a suitable reference.
Why is the shape of the earth geoid?
The shape of the Earth is closer to a geoid rather than a perfect sphere due to variations in the density and composition of its interior. These irregularities have caused the planet to bulge at the equator and flatten at the poles, resulting in a shape that more closely resembles a geoid.
How large is the world?
The circumference of the earth at the equator is 24,901.55 miles (40,075.16 kilometers).But, if you measure the earth through the poles the circumference is a bit shorter - 24,859.82 miles (40,008 km). This the earth is a tad wider than it is tall, giving it a slight bulge at the equator. This shape is known as an ellipsoid or more properly, geoid (earth-like).
Shape of earth geoid or spherical?
The Earth is best modeled as an oblate spheroid, meaning it is mostly spherical but slightly flattened at the poles and bulging at the equator. The geoid, on the other hand, represents the Earth's gravitational field and is irregular due to variations in density and topography.
Is the earth 13000 kilometers in diameter?
The diameter of the earth at the equator is 12,756.32 kilometers or 7,926.41 miles. The diameter of the earth through the poles is 12,715.43 kilometers or 7,901.00 miles. Thus the earth is 41 km or 25 miles wider than it is tall, giving it a slight bulge at the equator. This shape is known as an ellipsoid or more properly, geoid (earth-like).
How many miles at the equator is the earth?
The circumference of the earth at the equator is 24,901.55 miles (40,075.16 kilometers). But, if you measure the earth through the poles the circumference is a bit shorter - 24,859.82 miles (40,008 km). This means the earth is a tad wider than it is tall, giving it a slight bulge at the equator. This shape is known as an ellipsoid or more properly, geoid (earth-like).
What is the geoid of the earth?
The geoid is an equipotential surface that represents mean sea level around the Earth, taking into account the planet's gravitational field and rotation. It serves as a reference for measuring elevation and is used in creating precise global height models for applications like GPS systems and geodesy.
Is the earth's diameter at the equator 7926.68 milesthrough the poles is it 7899.98?
The diameter of the earth at the equator is 7,926.41 miles or 12,756.32 kilometers. The diameter of the earth through the poles is 7,926.41 miles or 12,756.32 kilometers. Thus the earth is 25 miles or 41 km wider than it is tall, giving it a slight bulge at the equator. This shape is known as an ellipsoid or more properly, geoid (earth-like).
What are the different types of heights in geodesy?
Some common types of heights in geodesy include ellipsoidal height (measured above or below the reference ellipsoid), orthometric height (measured above or below a geoid model), and dynamic height (used in oceanography to account for variations in sea surface height). Each type of height serves a different purpose based on the specific application in geodesy.
