What is the main job of determining the plane coordinates of a point?

The main work of measuring the plane coordinates of points is to measure the horizontal distance and angle.

Application principle in real life: define the concept of coordinate azimuth, calculate the coordinate azimuth according to the known point coordinates, and determine the plane position of the point and the coordinates of the unknown point.

Life examples:

In the process of municipal engineering construction survey, the practical problem of setting out the points to be fixed with theodolite and steel ruler according to the known traverse control points is often encountered. In order to solve this kind of problem, we often need to calculate the coordinate azimuth or point coordinates.

The method in this practical work process:

1, calculate the coordinate azimuth according to the known control points, and set out the plane position of the points (polar coordinate method).

2. Firstly, the concept of azimuth is defined. Azimuth refers to the angle from the northern end of the standard direction of the starting point of the straight line to the clockwise direction of the straight line, with the coordinate azimuth (hereinafter referred to as azimuth) as the standard direction.

3. Select the plane rectangular coordinate system for measurement, and specify the ordinate axis as the X axis and the abscissa axis as the Y axis. Quadrant names are arranged clockwise, namely 1 quadrant× >; 0y & gt0; The second quadrant × < Oy >; 0; The third quadrant ×

4. When the X-axis and Y-axis are interchanged, the order of quadrants is opposite, but the essence of measuring coordinate system is the same as that of mathematical coordinate system, so it can be directly measured and calculated by mathematical formula.