Research and Evaluation on Dynamic Maintenance of an Elevation Datum Based on CORS Network Deformation

This paper presents a method for dynamically maintaining regional elevation datum using CORS stations as core nodes. By utilizing station data and surface mass loading (including land water storage, sea level, atmospheric pressure), the normal height changes of each can be determined maintained. The validity this is verified multiple leveling survey results from five in Beijing’s subsidence area between January 2012 June 2021. Results show that it necessary to derive correct anomaly variation caused by remove-calculate-restore Green’s function integration method, with influence reaching subcentimeter level. exhibiting great observation quality achieve mean accuracy 2.7 mm determining changes. Such surpasses requirements second-class surveys covering route lengths exceeding 1.35 km, well conforming/closed loop routes distances greater than 0.46 km. strategically selecting long-term continuous observations high-quality nodes within control network, dynamic maintenance achieved based on data.