Print Email Facebook Twitter Comparison of GNSS Processing Methodologies for Subsidence Monitoring Title Comparison of GNSS Processing Methodologies for Subsidence Monitoring: NAM GNSS Alternative Processing Method Project Author van der Marel, H. (TU Delft Mathematical Geodesy and Positioning) Date 2020 Abstract Gas production and the resulting reduction of reservoir pressure cause compaction of the reservoir formation. This is expressed as subsidence at surface, which e.g. requires measures to maintain the ground water level in the area above the Groningen gas field. Subsidence measurements are also used to determine the compaction of the gas reservoir, which drives seismicity in the Groningen area. Monitoring of subsidence is therefore an important activity for NAM. Different techniques are used to monitor subsidence: levelling surveys, GNNS-measurements and InSAR satellite observations. The Study and Data Acquisition Plan for Winningsplan 2016 (Ref. 1 and 2) included a research program into the monitoring of subsidence aiming to improve the processing and interpretation of the GNSS (Ref. 3 and 4) and In-SAR technologies (Ref. 5 and 6). The goal of the NAM GNSS Alternative Processing Methodologies project is to compare existing GNSS processing methodologies, to investigate potential biases in the solutions and to obtain transparent time series estimates (decomposition of signals) for NAM monitoring stations, with the final aim to detect deformation trend changes with predefined confidence levels.In the current report three GNSS processing methods have been investigated: State Space modeling (SSR, currently used by NAM), regional network processing with the Bernese GNSS Software (BSW), and Precise Point Positioning (PPP). To reference this document use: http://resolver.tudelft.nl/uuid:d7a427a2-9db4-4468-9a83-5bc18e64bf47 Publisher Nederlandse Aardolie Maatschappij Part of collection Institutional Repository Document type report Rights © 2020 H. van der Marel Files PDF Comparison_of_GNSS_Proces ... ing_1_.pdf 24.27 MB Close viewer /islandora/object/uuid:d7a427a2-9db4-4468-9a83-5bc18e64bf47/datastream/OBJ/view