What are the general steps of traverse coordinate calculation

1. Sort out the order and list the measured data in order.

2. Calculate the observation angle and look at the azimuth angle.

What is the closure error, if it is within the specification, you can adjust the difference, otherwise find the problem and re-observe.

3. After the angle draw is assigned, recalculate the coordinate increment, 4. Calculate the coordinate increment of x and y respectively, calculate whether the closure difference is within the specification, and the adjustment is not allowed if it exceeds the specification.

5. Incremental allocation, reverse distribution according to distance.

Calculate the azimuth.

Poor closure, when the reverse sign is evenly distributed;

Calculate the azimuth angle of the traverse edge, calculate the coordinate increment of the traverse edge, and calculate the closure error of the coordinate increment.

Calculate the relative closure difference of the full length, where is the sum of the lengths of each side of the wire, if it is <, it is distributed according to the proportion of the side length.

Calculate the coordinate increment of the corrected traverse edge, and calculate the plane coordinates of unknown points.

Wire length) d Sum of measured side lengths.

Sum of angles) The sum of the measured left angles and bai.

Angular closure error) f The number of second digits of the sum of the measured left angles.

Coordinate closure difference) is the sum of the coordinate increments calculated by fx x.

Coordinate calculation: x=x+scosa, y=y+ssina (a, is the coordinate azimuth, s is the distance between two points, skew).

Coordinate backcount: s= x 2+y 2 a=arctan|y2-y1/x2-x1|, the calculated azimuth a is an acute angle, and then according to the plus and minus signs of y2-y1 and x2-x1.

Determine the quadrant where a is located, and then use the azimuth angle and quadrant angle.

The relationship determines the value of a.

The purpose of internal calculation is to eliminate the contradiction between the observations through calculation, and finally obtain the coordinates of each point. The steps and methods for hand calculation with the help of a calculator are as follows.

1. Calculate the preparation before shouting.

Check the field observation handbook (including horizontal angle observation, edge length observation, magnetic azimuth observation, etc.) to confirm that the observation, recording and calculation are successful and correct.

Draw a traverse sketch. A sketch is a schematic, drawing scale.

There is no strict requirement for the thickness of the line, but it should be noted that it is beautiful, generous, appropriate in size, similar to the actual figure, and generally consistent with the actual location. All known data (known azimuth, known point coordinates) and observational data (horizontal angle value, side length) should be correctly transcribed in the diagram, with neat handwriting and correct position.

Plot calculations. Transcribe known and observed data in the corresponding list, and ensure that the transcription is correct. In the column of roll call or point number, the roll call name or point number should be filled in the order in which the coordinates are calculated.

2. Calculation of closed wires.

1) Preparation: Fill in the verified field observation data and starting data into the closed traverse coordinate calculation table.

2) Calculation and adjustment of angle closure error.

3) Use the corrected turning angle to calculate the coordinate azimuth angle of each side.

4) Calculation and adjustment of coordinate increment closure error.

3. Calculation of attached wires.

The calculation steps of the attached traverse are basically the same as those of the closed traverse, except that the calculation formulas of the angular closure error and the coordinate increment closure error are different.

1) Calculation of angular closure error.

2) Calculation of the coordinate increment closure error.

4. Calculation of branch wires.

Because the branch traverse neither returns to the original starting point, nor is it attached to another known point, there is no check restriction on the branch traverse, and there is no need to calculate the angle closure error and the coordinate increment closure difference, as long as the azimuth angle of the known side and the coordinates of the known point, the turning angle and the length of the traverse side determined by the field, directly calculate the azimuth angle of each side and the coordinate increment of each side, and finally calculate the coordinates of the target traverse point.

1. Sort out the order, list the measured data in order 2, calculate the observation angle, see what the azimuth angle closure difference is, within the specification, you can adjust, otherwise check the fault and re-observe 3, after the angle draw is distributed, recalculate the coordinate increment, 4, calculate the coordinate increment of x and y respectively, calculate whether the closure difference is within the specification rubber range, and do not allow the adjustment if it exceeds the specification 5, the distribution of the increment is sold and the distribution is reversed according to the distance.

1. Sort out the order and list the measured data in order.

2. Calculate the observation angle, see what the azimuth closure difference is, if it is within the specification, it can be adjusted, otherwise find the problem and re-observe.

3. After the angle draw is assigned, recalculate the coordinate increment, 4. Calculate the coordinates of x and y respectively, calculate whether the closure difference is within the specification, and the adjustment is not allowed if it exceeds the specification.

5. Incremental allocation, reverse distribution according to distance.

The basic coarse elimination method for traverse coordinate calculation is ().

a.The coordinates are calculated.

b.Coordinate backcounting.

c.Azimuth calculation is known.

d.Height difference closure adjustment.

e.Calculation of the full bench closure difference of the wire.

Correct answer: ABC