Abstract
The main aim of the article was to analyse the actual accuracy of determining the vertical movements of the Earth’s crust (VMEC) based on time series made of four measurement techniques: satellite altimetry (SA), tide gauges (TG), fixed GNSS stations and radar interferometry. A relatively new issue is the use of the persistent scatterer InSAR (PSInSAR) time series to determine VMEC. To compare the PSInSAR results with GNSS, an innovative procedure was developed: the workflow of determining the value of VMEC velocities in GNSS stations based on InSAR data. In our article, we have compiled 110 interferograms for ascending satellites and 111 interferograms for descending satellites along the European coast for each of the selected 27 GNSS stations, which is over 5000 interferograms. This allowed us to create time series of unprecedented time, very similar to the time resolution of time series from GNSS stations. As a result, we found that the obtained accuracies of the VMEC determined from the PSInSAR are similar to those obtained from the GNSS time series. We have shown that the VMEC around GNSS stations determined by other techniques are not the same.
Highlights
The main aim of the article was to analyse the actual accuracy of determining the vertical movements of the Earth’s crust (VMEC) based on time series made of four measurement techniques: satellite altimetry (SA), tide gauges (TG), fixed global navigation satellite systems (GNSS) stations and radar interferometry
persistent scatterer (PS) point targets from ascending or descending tracks are located in the proximity of a GNSS station, ~10 m
The height of the PS points should be estimated to check whether the PS comes from the same technical infrastructure object and not from the surface level; Points should be selected from the area with the same slope
Summary
The main aim of the article was to analyse the actual accuracy of determining the vertical movements of the Earth’s crust (VMEC) based on time series made of four measurement techniques: satellite altimetry (SA), tide gauges (TG), fixed GNSS stations and radar interferometry. Earth’s crust are significantly related to the maintenance and updating of coordinate systems, human activity, monitoring of flood hazards and changes in the mean sea level [1,2,3,4,5,6] These movements are manifested by the horizontal and vertical displacement of tectonic plates [7]. Vertical movements of the earth’s crust are classified as relative or absolute (geocentric) movements, direct or indirect movements and point or surface movements They can be determined based on measurements involving various techniques, including geometric levelling, global navigation satellite systems (GNSS), Doppler orbitography and radiopositioning integrated by satellite (DORIS), satellite laser ranging (SLR), synthetic aperture radar (SAR) and very long baseline interferometry (VLBI). These differences can be attributed to environmental and anthropogenic factors, the types of applied data [10] and the data compilation method
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