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Monitoring ground deformations with interferometry of Radar satellite images

Chardaloupas Dionysios

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Summary

The purpose of this Master's thesis is monitoring and identification of areas that exhibit deformations using SAR satellite images from the Sentinel-1 mission of the European Space Agency in the region of Chania, Crete, Greece. The intense topography of the terrain in Crete, in combination with the seismic activity of the region and the deformations caused by extreme weather phenomena, makes continuous monitoring of ground deformations necessary. The rugged topography of Crete, combined with the seismic activity in the area and the deformations caused by extreme weather phenomena, makes continuous monitoring of soil deformations necessary.For the implementation of the above project in the prefecture of Chania, a ground deformation map was created from 129 SAR images of the Sentinel-1A satellite through the long-term technique of Distributed Scatterers (DS) and Small Baseline Subset (SBAS).A total of 630 interferograms were produced and the main sources of noise in the interferometric phase, such as Solid Earth Tides and tropospheric effects, were removed. The resulting ground velocity map was compared with GPS measurements from permanent stations, with a mean square error of 1.54 mm/year. Seven areas with surface displacements, mainly in mountainous regions, were identified, with velocities ranging from 7 to 20 mm/year.

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