Run a GNSS Loop Closure Results Report

After all the baselines in your project have been processed and saved, run GNSS Loop Closure to generate a GNSS Loop Closure Results report to identify any bad vectors. To ensure that the loop closure results are useful, structure your network so that the baselines create small closed figures. If all the baselines in a loop are from the same session, station setup errors that are common to all the baselines in that session cannot be detected.

The settings used for computing loop closure are set in Report Options.

To run a Loop Closure Results report:

Select GNSS Loop Closure in Survey > GNSS.
The GNSS Loop Closure Results report displays in your default Web browser.
Caution: Be sure no objects are selected before running loop closure; otherwise, you may get erroneous results.
Review the failed loop results to determine if there are any bad vectors. Bad lines can be disabled to ensure the quality of your project. If possible, replace a disabled line with a redundant line.
To disable a bad vector:
- In the vector spreadsheet, hover over the status column for the vector you are going to disable. On the drop-down menu, select Disabled. You can also disable a vector using the Properties pane. The status updates immediately.
- To disable several vectors at once, multi-select them, and use the Disable Vectors command.
If necessary, disable vectors using different solutions until you are satisfied with the loop closure results. At this point, you are ready to move on to network adjustment.

To set the loop closure computation parameters:

Select Reports > Report Options in the Quick Access Toolbar.
Select GNSS Loop Closure Results in the Reports list.
Expand the Report Setting section in the Settings group.
Edit the report settings as needed.
Note: When you set the number of legs to use in each loop, if you select a number greater that 3, all loops with 3 or more legs (up to the number specified) are used in the loop closure computation.


GNSS Loop Closure Results Report
Summary On the left are links that will take you directly to specific sections in the report.	This shows the number of loops, loops that passed, failed, and the pass/fail criteria. Worst - Click this to select the worst loop in the project (of all those that failed). Note: The number of legs to use per loop and the pass/fail criteria are set in Report Settings in the Report Options command pane.
Failed Loops	This provides details for each loop that failed the criteria. Note: Click a vector name or point ID in any of the report sections to select it in the Project Explorer and graphic views.
Observations in Failed Loops	This lists the observations in failed loops and the number of occurrences in each loop.
Occupations in Failed Loops	This shows details about occupations in failed loops and the number of occurrences (the number of lines with bad occupations). This information can assist you in determining if you have a problem with an occupation, perhaps due to an incorrect antenna height. Click a link in the Point column to select the point and all of the lines in failed loops derived from this point's occupation. Click a link in the Observations column to select vector that was in a failed loop from this point's occupation.

To change report settings:

Select Reports > Report Options in the Quick Access Toolbar.