Explanation of the terms GEOID 30

Interpretation of the geoid in the military term] The average value of the global ocean scale and the static sea surface topography.

The horizontal plane of the zero plane overlap and extending to the interior of the continent is an isotope in the Earth's gravitational field and the starting plane of the orthometric system in elevation measurement. Due to the undulating topography of the earth's surface and the uneven distribution of internal mass, the geoid becomes the shape of the earth with slightly undulating curved surfaces.

It mainly refers to the shape of the geoid surface.

Chinese Dictionary:

Geoid in the Chinese dictionary.

refers to the water level that rejoins with the mean sea level and extends into the interior of the continent. It is a high datum. In the surveying work, the geoid is used as the basis.

Due to the undulating surface of the earth and the uneven distribution of mass in the earth's interior, the geoid is an irregular surface with slight undulations. The shape enclosed by this surface resembles a spinning ellipsoid, called a "terrestrial body", and is often used to represent the physical shape of the Earth.

The geoid is an imaginary closed surface formed by the expansion of the Earth's freely stationary sea level. It is usually considered to be the true contour of the Earth. The form it encloses becomes the earth body.

Because the shape and size of the earth mass are very close to the shape and size of the natural earth, and the position is relatively stable, the geoid is generally selected as the common datum of field surveys in a large area. The concept of geoid was first proposed by the German mathematician Johann Benedict Listing in 1873.

The starting point of the altitude is the sea level at 45° north latitude (near Qingdao).

Geoid noun explained.

The geoid is the level that passes through the average sea level.

The geoid refers to the water level that rejoins with the mean sea level and extends into the interior of the continent, and is the datum of the correct height. In the surveying work, the geoid is used as the basis. Due to the uneven surface of the earth and the uneven distribution of mass in the earth's interior, the geoid is a slightly undulating irregular surface.

The shape enclosed by this surface resembles a pin in a spiked ellipsoid, called the "earth mass".

Introduction to geoid significance and formation1. The geoid is one of the geodetic datums, and determining the geoid is an important project in the national basic surveying and mapping. It scientifically combines geometric geodesy with physical geodesy, so that people can obtain important information such as altitude and the relationship between the earth's gravitational field while determining the geometric position of space. The shape of the geoid reflects the structure, density and distribution of materials in the earth's interior, and plays an important role in the research and application of oceanography, geological exploration, petroleum exploration and other fields.

2. The geoid is an irregular closed surface formed by the extension of the still sea surface to the mainland. It is an isotope of gravity, i.e., gravity does not do work when an object moves along that plane (e.g., water does not flow on this plane). The geoid is an important physical reference plane to describe the shape of the earth, and it is also the starting surface of the elevation system.

The determination of the geoid is achieved by determining its distance from the reference ellipsoid - the gap between the geoid and the geoid gap.

The geoidoid of mainland China was determined by using the earth level model and GPS level data.

The approach taken:

For each GPS leveling point, the earth level model is used to calculate its elevation anomaly, and the correction number of the calculated value is obtained by comparing it with the measured elevation anomaly of the GPS level, so as to correct the elevation anomaly calculated by the earth level model on the nearby grid points. The essence of the method is to fit the quasi-geoid calculated by the earth level model to the quasi-geoid measured by the GPS level. More than 950 GPS levels were used across the continent, with a distance of about 100 kilometers.

The datum of the coordinates of the geodetic spine is the geoid plane.

The datum of geodetic coordinates is the geoid level. Beam seepage.

The geoid is the water level that rejoins with the mean sea level and extends into the interior of the continent. It is a high datum. In the surveying work, the geoid is used as the basis.

Due to the undulating surface of the earth and the uneven distribution of the earth's internal mass, the geoid is a slightly undulating irregular surface of the acacia species.

The shape enclosed by this surface resembles a spinning ellipsoid, called a "terrestrial body", and is often used to represent the physical shape of the Earth.