The effect of instrumental precision on optimisation of displacement monitoring networks
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In order to detect the geo-hazards, different deformation monitoring networks are usually established. It is of importance to design an optimal monitoring network to fulfil the requested precision and reliability of the network. Generally, the same observation plan is considered during different time intervals (epochs of observation). Here, we investigate the case that instrumental improvements in sense of precision are used in two successive epochs. As a case study, we perform the optimisation procedure on a GPS monitoring network around the Lilla Edet village in the southwest of Sweden. The network was designed for studying possible displacements caused by landslides. The numerical results show that the optimisation procedure yields an observation plan with significantly fewer baselines in the latter epoch, which leads to saving time and cost in the project. The precision improvement in the second epoch is tested in several steps for the Lilla Edet network. For instance, assuming two times better observation precision in the second epoch decreases the number of baselines from 215 in the first epoch to 143 in the second one.
KeywordsOptimal design GPS network Landslide Observation plan
The authors would like to thank Formas for its financial support to the project Dnr-245-2012-356. The contribution and cooperation of Maud Wik and Ann Marie Wallin in the Lilla Edet municipality in organising the required data are also very much appreciated.
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