12. Network Adjustments

After completion of session processing, all sessions can be solved together in a Network Adjustment (available only from the Managers Page), thus creating the final results from your project. Regardless of the final result intended, OP suggests the user begin with a minimally constrained adjustment, also called the “Preliminary Adjustment” which uses the GPSCOM program. This is an important Quality Assurance step for subsequent adjustments.

If the intent is to determine the best set of coordinates in alignment with the latest realization of the NSRS reference frame, including the option to submit to NGS, then a NGS Project Tracking ID must be entered. With a tracking ID, OP steps you through a series of sequential network adjustments using a combination of GPSCOM and ADJUST. A conceptual workflow is illustrated in Fig. 12.1.

If the projects objectives do not include submission to NGS and there are no GVX vectors in the project, then a project tracking ID is not required and the user can run the final adjustment desired. However, the coordinates will be tied to the ITRF. But if GVX vectors are present either an actual or default tracking ID (0000) must be used.

Fig. 12.1 Conceptual work flow for running adjustments in OP