The differences between them are as follows:

Mathematically, the plane rectangular coordinate takes the longitudinal axis as the Y axis, which is positive upward from the origin and negative downward; Taking the horizontal axis as the X axis, it is positive to the right and negative to the left from the origin; Quadrants are numbered counterclockwise.

The plane rectangular coordinate system in the measurement takes the longitudinal axis in the north-south direction as the X axis, which is positive from the origin to the north and negative from the south; Taking the horizontal axis of the east-west direction as the Y axis, it is positive from the origin to the east and negative from the west; Quadrants are numbered clockwise.

When a point is expressed in polar coordinates in measurement, its angle value is calculated clockwise based on the north direction, while in mathematics it is calculated counterclockwise based on the horizontal axis. After the X-axis and Y-axis are interchanged vertically and horizontally, all trigonometric formulas in mathematics can also be directly applied to measurement without any changes.

Extended data

CAD has a good user interface, and various operations can be performed through interactive menus or command lines.

The software functions are as follows

(1) has perfect graphic drawing function.

(2) It has powerful graphic editing function.

(3) Secondary development or user customization can be carried out in various ways.

(4) It can convert various graphic formats and has strong data exchange ability.

(5) Support various hardware devices.

(6) Support multiple operating platforms.

(7) strong universality and convenient use.

Baidu encyclopedia -cad