absolute electromagnetic system的意思|示意

'

Absolute electromagnetic systems refer to reference systems with a defined three-dimensional origin and a global orientation (usually defined by the earth's magnetic field). Absolute electromagnetic systems are used in surveying, surveying engineering and geodetic engineering.

In surveying, absolute electromagnetic systems can be used to measure the coordinates of points in terms of azimuth, elevation and distance. Azimuth defines the direction along which a point lies and can be expressed in terms of degrees clockwise relative to North. Elevation defines the vertical distance from a point relative to sea level and can be expressed in terms of meters. Distance is the horizontal distance from a point to another and can be expressed in terms of meters.

In geodetic engineering, absolute electromagnetic systems are used to determine the exact positions of points on the earth by using triangulation and trilateration techniques. Triangulation is a process of determining the exact positions of points on the earth by measuring their distances from three known points. Trilateration is a process of determining the exact position of a point on the earth by measuring its distances from three known points.

In surveying engineering, absolute electromagnetic systems are also used to measure angles, distances and directions between two or more points. Angles are measured with the help of a theodolite, while distances and directions are measured with the help of an EDM (Electronic Distance Measurement) instrument.

To sum up, absolute electromagnetic systems are used to measure the coordinates of points in terms of azimuth, elevation, and distance in surveying, to determine the exact positions of points on the earth by using triangulation and trilateration techniques in geodetic engineering, and to measure angles, distances and directions between two or more points in surveying engineering.