Process Baselines

Process baselines to determine and promote the highest quality coordinates for each point in your project. Vectors are created from baselines using these points. You can process all of your project's baselines at once or select a subset to process.

Depending on your software license, you can process L1 data, or multi-frequency data.

To process baselines:

Before processing baselines, review and edit the baseline processing settings in the Project Settings dialog.
Pick the baselines that you want to process in a graphic view or in the Project Explorer. To select unprocessed sessions, select Select Unprocessed Sessions. To process all of the baselines in your project, do not select anything. Selected baselines are highlighted in graphic views and the Project Explorer.
Do one of the following:
- Select Process Baselines in Survey > GNSS.
- With baselines or a session selected, right-click, and select Process Baselines from the context menu.
The Process Baselines dialog displays, and processing begins. During processing, data for each baseline appears in the dialog.
Note: The columns in the table can be sorted in ascending or descending order by clicking the column heading. You can also rearrange the table by clicking and dragging the column headings to new locations. When processing completes, the Save button appears.
To halt processing any time, click Stop. To resume, click Process. You can also set baseline processing not to automatically start in Project Settings.
To view the optimal processing order used by the software, click the Order button.
Click Report to view the Baseline Processing Report. If the processing results are unsatisfactory, edit the sessions and reprocess the baselines.
Note on baseline processing modes...
TBC automatically selects the appropriate mode to use to process baselines for static GNSS data. The selected mode is displayed in the Baseline Processing Report after you perform processing. TBC dynamically selects the best mode to use based on baseline length, occupation time, available signals, and other criteria. Displayed modes include:
- Uncombined Mode - This processing mode, generally used for short baselines, uses uncombined multi-frequency processing either with or without ionsospheric modeling.
- Wide Lane Mode - This processing mode, generally used for long baselines, uses a combination of ionosphere-free processing and wide lane (IF/WL) processing, or a mix of IF/WL processing and Melbourne-Wubbena processing.
- Melbourne-Wubbena Mode - This processing mode, generally used for very long baselines, uses Melbourne-Wubbena processing exclusively. (Due to code biases, this mode is used only for baselines between devices from the same manufacturer.)
This should provide you a better understanding of how baseline processing was performed on your static GNSS data when you are viewing the resulting baseline and the Baseline Processing Report. For more information on the various baseline processing modes used in TBC, visit the Trimble Business Center: Bulletins and Updates page at https://geospatial.trimble.com/trimble-business-center-bulletins-and-updates and select to view Modernized Approaches for GNSS Baseline Processing White Paper.
Click Save to compute the project and display the processed vectors. The points update with the new coordinate values. When you are done processing baselines, you are ready to proceed to loop closure and network adjustment.

To view processed vectors:

In graphic views, unprocessed baselines are blue-green, and processed baselines/vectors are blue. Vectors appear in the Project Explorer underneath their associated sessions. You can also select Baselines or Processed Vectors in the View Filter to see your results more clearly.

For a detailed list of all the processed and saved vectors, use the Vector Spreadsheet. This is helpful if you need to process vectors in groups instead of all at once. To view a list of all the processed vectors in the project, you can also run a Vector List report.

To clear previously saved processing results:

Select Clear Processing Results in Survey > GNSS. The saved results for the last group of vectors processed are deleted, and the vectors are removed from graphic views and the Project Explorer.