What are the characteristics of modern geodesy?

The characteristics of modern geodesy are as follows:

1, with high accuracy.

Modern geodesy adopts high-precision measuring instruments and technical means, which can reach sub-meter measurement accuracy and is more accurate and reliable than traditional geodesy methods.

2. Global coverage.

Modern geodesy can use satellite remote sensing and GPS technology to measure and monitor the global surface and achieve the goal of global coverage.

3. High efficiency.

Modern geodesy can not only collect a large number of data quickly, but also process and analyze the data through automatic tools such as computers, which improves the work efficiency.

4. comprehensive.

Modern geodesy involves many subjects, such as surveying, geophysics and remote sensing technology. , need to comprehensively use a variety of technical means and methods.

5. Real-time.

Modern geodesy can grasp the surface changes in time through real-time monitoring and data feedback, and provide strong support for emergency rescue and resource management.

Introduction to Geodesy;

Geodesy is a branch of surveying and mapping. Study and determine the shape, size and gravity field of the earth, and determine the geometric position of ground points. Determining the size of the earth in geodesy refers to determining the size of the earth ellipsoid; Studying the shape of the earth means studying the shape of the geoid.

Determining the geometric position of the ground point refers to determining the position of the ground point with reference to the ellipsoid of the earth. The ground point is projected onto the ellipsoid of the earth along the normal direction. The horizontal position of the point is expressed by the geodetic latitude and longitude of the projection point on the ellipsoid, and the geodetic elevation of the point is expressed by the normal distance from the ground point to the projection point.

The geometric position of this point can also be expressed by three-dimensional coordinates in the spatial rectangular coordinate system with the center of mass of the earth as the origin.

Geodetic work is to provide a plane position control network and an elevation control network for large-scale topographic mapping, a gravity control point for gravity exploration of underground mineral deposits, and accurate coordinates of ground stations and earth gravity field data for launching artificial earth satellites, missiles and various spacecraft.