What is the angle of raising your head? What's the overlooking angle?

Elevation (an? Elevation; ? Ann? Angle? Yes? Elevation): When the line of sight is above the horizontal line, the angle formed by the line of sight and the horizontal line in the vertical plane where the line of sight is located is called elevation.

angle of depression

1: the included angle between the horizontal line and the descending line segment in the vertical plane (when looking down, the included angle between the line of sight and the horizontal line is the depression angle).

2. The vertical angle under the horizon observed from the surveyor's instrument to the observation point.

3: The depression angle ranges from 0 to 180.

4. When the line of sight is below the horizontal line, the angle between the line of sight and the horizontal line is also called the depression angle on the vertical plane where the line of sight is located.