Adjust Level Runs

Use the Adjust Runs command to adjust one or more level runs displayed in the Level Editor dialog by spreading any misclosure proportionately throughout all of the measurements.

There are two methods TBC can use to adjust level data in the Level Editor. The method used is based on the values you enter in the Default Standard Errors > Leveling section in Project Settings (select Project Settings in the Quick Access Toolbar).

An adjustment based on distance of the level run -
This method is used if a value greater than 0 (zero) is entered in the Default standard error on 1 km of double leveling field in Project Settings > Default Standard Errors > Leveling. To determine the correction to apply to each turn, TBC divides the total setup (B+F) distance for turn 1 by the total run distance. That value is then multiplied by the correction value being applied to the entire run. The result is the correction to be applied to turn 1. For turn 2, the total setup (B+F) distance for turn 1 AND turn 2 combined is divided by the total run distance, and that value is multiplied by the correction value being applied to the entire run. For turn 3, the total setup (B+F) distance for turn 1 AND turn 2 AND turn 3 combined is divided by the total run distance, and that value is multiplied by the correction value being applied to the entire run. And so on.
For example, say a level run between benchmarks A and B is 300m, has five turns and the correction between benchmarks A and B is 0.015m. Turn 1 has a B+F distance of 45m, so the correction value for turn 1 is 45m/300m * 0.15. = 0.0023m. Turn 2 has a B+F distance of 35m, so the correction value for turn 2 is (45m + 35m)/300m * 0.015 = 0.0040m. And so on until turn 5.
An adjustment based on the number of turns in the level run -
This method is used if a value greater than 0 (zero) is entered in the Default standard error for each station setup field in Project Settings > Default Standard Errors > Leveling. It is typically used when horizontal distances are not known. To determine the correction to apply to the first turn, TBC divides the correction to be applied between the two benchmarks by the number of turns in the run. Then, for each subsequent turn, it multiplies that value by the number of the turn.
For example, say a level run between benchmarks A and B has five turns and the correction between benchmarks A and B is 0.015m. Turn 1 will have a correction of (0.015m/5 turns) = 0.003m. Turn 2 will have a correction of (2 * 0.003m) = 0.006m. Turn 3 will have a correction of (3 * 0.003m) = 0.009m. And so on until turn 5.

Note: It is recommended that typically only one of the two Project Settings > Default Standard Errors > Leveling settings contain a value greater than 0 (zero). If both settings contain a value greater than 0 (zero), the corrections per KM and per station are combined.

When multiple side shot observations exist for the same point name in a level run, the software will include the side shot readings in the level adjustment (the Side Shot boxes will be checked in the Level Editor dialog). If you do not want these side shot readings to be included in the level adjustment, either uncheck the Side Shot boxes or rename the associated point IDs so they are not the same.

Prerequisites:

See the Subscription Plans page. For a license matrix by command, see the License page in the TBC Community. Also see View and manage licensed features.

To adjust level runs:

Do one of the following:
- Right-click an imported level data file node or the Keyed-In File node in the Project Explorer and select Level Editor from the context menu.
- Select Level Editor in Survey > Optical and select the imported level data file in the Select Leveling Files dialog.
The Level Editor dialog displays a tab for each run in the data file, allowing you to view and/or edit each run individually.
Click Adjust Runs. The Adjust Runs dialog displays.
In the Adjust Runs dialog, select the runs you want to adjust.
These runs will all be adjusted simultaneously as one network. When runs have points in common, the recommended procedure is to adjust them together.
Click OK.
Note: Performing an adjustment replaces any previously adjusted elevations, such as those from the instrument.
You can view the adjusted results in the Level Editor dialog by selecting the Use Adjusted Elevations option in the upper left area of the tab.
When you are done working in the Level Editor dialog, click OK.