Oct 26, 2020   5:21 p.m. Demeter
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Final theses


Basic information

Basic information about a final thesis

Type of thesis:
Diploma thesis
Thesis title:
Satellite radar interferometry utilization for ground stability monitoring of geological active area
Written by (author):
Ing. Richard Czikhardt
Department:
Thesis supervisor:
Opponent:Ing. Milan Lazecký, PhD.
Final thesis progress:
Final thesis was successfully defended.


Additional information

Additional information about the final thesis follows. Click on the language link to display the information in the desired language.

Language of final thesis:
English

Slovak        English

Title of the thesis:
Satellite radar interferometry utilization for ground stability monitoring of geological active area
Summary:Multi-temporal synthetic aperture radar (SAR) interferometry techniques (MT-InSAR) are nowadays a well-developed tool for ground stability monitoring. They aim to overcome the major limitations of differential InSAR, employing the long series of SAR images to identify radar targets, which do not change their backscattering characteristic over time (persistent scatterers - PS). For such points, temporal evolution of deformation can be retrieved, thus forming a natural, opportunistic geodetic network to monitor seismic activity, landslides, cities, or even individual structures. This application capability is currently emphasized by operational programme of Sentinel-1 satellite mission, providing freely available SAR images of whole Earth’s surface within 6 days repeat cycle. We perform MT-InSAR stability analysis over wider region of Poprad basin and eastern part of the High Tatras Mts., utilizing over 60 Sentinel-1 images per both of its ascending and descending orbits, which cover time period of years 2015 and 2016. This site is notable for its diverse geological structure along with several recognized neotectonic faults. At the same time, it presents a technology’s feasibility challenge in sparsely urbanized and mountainous region, affected by severe atmospheric perturbations. Hence, in addition to standard methodology implemented in SARPROZ, we incorporate the processing chain based on an open-source tools, combining the SNAP application platform and StaMPS methodology with regard to specifics of natural terrain and Sentinel-1 images. Individual approaches show a good match, StaMPS however provides denser PS coverage and managed to identify PSs even in mountains, while SARPROZ excels at PS geocoding. The study’s results are deformation maps providing a global outlook on the relative movements in the area of interest. Several, millimetre level ground motion processes have been identified for the first time: the long-wavelength uplift of Štrbský horst – a possible indicator of recent tectonic activity, as well as small-area subsidence in Gánovce village and creeping landslides on the slopes of Ostrva and Skalnatá valley. A complex evolution of its deformation scenarios is contained in the PS kinematic time series. Moreover, those confirm the millimetre accuracy comparable to conventional geodetic techniques, yet maintaining the vast spatial coverage at the low-cost merit. Results are validated via GNSS permanent observations and landslide susceptibility information. Finally, in order to better interpret the results, we decompose the deformation signal into local datum, taking the advantage of both available acquisition geometries. Remarks concerning the future perspectives of MT-InSAR applicability within regional stability monitoring of Slovakia territory enclose our study.
Key words:
radar interferometry, Sentinel-1, MT-InSAR, SARPROZ, StaMPS, deformation monitoring

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