Abstract
Abstract. The main purpose of this study is to investigate the possibilities of monitoring crustal movement, during collective evaluation of first- and second-order GPS densification networks. The new criteria, which are independent from the network datum, are widely used for the evaluation and quality processing of geodetic networks. In this study, the values of detectable minimum displacement for a real GPS network are investigated as well as how sensitivity levels are affected by additional datum conditions, which are added to the adjustment model.
Highlights
In a comparison of different periods or campaigns related to a geodetic network, the magnitude of the undetectable systematic errors in the coordinate differences gives us important information about the sensitivity level of the geodetic network
Even–Tzur (2010) suggested that the sensitivity levels of geodetic networks could be able to improve by using an extended Helmert transformation model representing the strain model
Sensitivity and reliability levels are a good indicator for network quality
Summary
In a comparison of different periods or campaigns related to a geodetic network, the magnitude of the undetectable systematic errors in the coordinate differences gives us important information about the sensitivity level of the geodetic network. The reliability analysis of the geodetic networks was firstly introduced by Baarda (1968) with his famous study about data snooping. Nowadays, this approach, which is quite popular in the field of geodesy science, has been discussed together with robustness and sensitivity analysis. Even–Tzur (2010) suggested that the sensitivity levels of geodetic networks could be able to improve by using an extended Helmert transformation model representing the strain model. A mixed approach is proposed for the analysis of sensitivity This approach is a synthesis of three different analysis techniques, which are called a priori sensitivity analysis, external reliability analysis and the effects of extended datum condition on the sensitivity levels. According to the extended datum condition, behaviours of sensitivity levels are examined comparatively
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