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When there is no line of sight between the existing control point and the loft point, a new point needs to be set. There are two methods for obtaining new points in the total station lofting mode: the polar coordinate method and the rear rendezvous method.
Polar coordinates
The polar coordinate method is a method to determine the location of the desired point according to the angle between a known direction on the measuring station and the direction of the desired point and the distance from the measuring station to the desired point.
The operation steps of the polar coordinate method: select the job file - station setting - get a new point.
1. Select the job file
After the total station is turned on and aligned, press [menu] to select the lofting. You can manually enter a new file or choose to call an existing file.
Specific steps [menu]—[f3 lofting]—[f2 call]—selecting the file [f4 enter].
2. Station setting:
The polar coordinate method needs to be oriented by looking back at the known point or azimuth, and the first survey site input is selected after the lofting mode operation file is completed, and the input of the survey site can be selected by directly entering the point number, calling the point list and directly entering the coordinates of the survey site to set the measuring site. If you do not measure the elevation, you can not enter the prism height, and the post-measurement station setting is completed.
Specific steps: [F1 test site input] -- F2 call] -- select test site A [F4 enter] -- F3 is] -- F4 OK].
Backward view orientation: This time the backward view of the known point is taken as an example. Select the backsight, the input mode of the backsight point is the same as that of the test site, which is divided into three ways, select and call the backsight point B, OK, carefully review the coordinates of the backsight point, select Yes after correcting the backsight point B, and select Yes after aligning the backsight point B, and complete the orientation of the backsight point.
Specific steps: [F2 Rear View] -- F2 Call -- Test Site B [F4 Enter] -- Check the Rear View Coordinates [F3 Yes] -- Align the Rear View Point [F3 Yes].
Shine on the backsight point [F3 Yes].
3. Get the location of the new point
In lofting mode, select the polar coordinate method in the new point on the second page, select the method of creating a new file or calling an existing file, and enter a new one.
The point number of the point can not be measured without entering the prism height OK Illuminate the target NPP P toggle the prism mode and click to measure and record new.
Click Find to view the data of the new point measured.
Specific steps: [F4] to enter the second page -- [F2 New Point] -- F1 Polar Coordinate Method] -- F4 Enter] -- F1 Input] -- F4 OK] -- F1 Measurement -- [F3 Yes].
The above steps can be repeated to obtain the plane positions of the other points to be measured.
Rear rendezvous method
The rear intersection method is a method of engineering surveying, which is mainly a method of making horizontal angle observation to at least three known points on the waiting point, and calculating the coordinates of the waiting point according to the coordinates of the three known points and the two horizontal angle values.
Instruments are placed on the new station, new coordinates are calculated with the coordinates of up to 5 known points and the measurement data of these points, and the observations of the rear rendezvous are as follows:
Distance Measurement Rear Rendezvous: Determination of 2 or more known points.
Angular measurement rear rendezvous: Determination of 3 or more known points.
1) Enter the lofting menu P2 and press the number button [2] (rear rendezvous method);
2) Enter the new point roll call, code and instrument height. Press the [F4] (Confirm) key;
3) Press [F1] (Enter), enter the dot number of the known point A (it can also be called here), and press [F4] (Confirm) key;
4) If the point does not exist in the file, when you press [F4] (Confirm), it prompts: the point name does not exist, at this time, you can directly enter the coordinates of the point, press [F3] (coordinates), after entering, confirm and press the [F4] key; [Confirm] If the roll call exists in the file, press the [F4] (Confirm) button, 5) press the [F4] (Confirm) screen prompt to enter the target height, and press the [F4] (Confirm) button when the input is complete;
6) Aim at the known point A and press the [F3] (Angle) or [F4] (Distance) button. For example, press the [F4] (distance) key;
Start the measurement function;
7) Enter the known point b input display.
8) Measure the known point b according to steps 5)-8), and the residuals are calculated when two known points are measured with "distance";
9) Press [F1] to measure other known points, up to 5 known points;
10) Press the [F4] (Calculate) button to view the result of the rear rendezvous, and display the standard deviation of the coordinate value.
11) Press [F4] (coordinates) to display the coordinates of the new point. Press [F4] (Yes) to record the data.
12) The coordinates of the new point will be stored in the coordinate file and will be used as the coordinates of the survey site.