Μελέτη Εδαφικής Παραμόρφωσης Στην Εκτίμηση Ηφαιστειακής Επικινδυνότητας Τη Χρήσει Διαστημικών Και Γεωφυσικών Τεχνικών

Παπαγεωργίου, Ελένη; Papageorgiou, Eleni

doi:10.12681/eadd/26334

Cited by 1 publication

(1 citation statement)

References 169 publications

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“…The geological setting of Santorini as well as complex relief offers a unique setting for such analysis. In addition, the deformation field of the volcano, as derived from InSAR [16,17] and other geodetic techniques [18,19,20,21], indicate the lack of significant displacements in the period 1992-2010 that would potentially contribute to decorrelation over large temporal spans. Furthermore, the availability of geodetic networks (GPS and levelling) in the island for monitoring its volcanic activity highlight the necessity for evaluation of the capacity of repeat-pass SAR interferometry for deformation mapping in a more quantitative manner.…”

Section: Pilot Site Selection and Data Usedmentioning

confidence: 99%

Moving from Temporal Coherence to Decorrelation Time of Interferometric Measurements Exploiting ESA?s SAR Archive

Foumelis

Mitraka

Cuccu

et al. 2015

Proceedings of Fringe 2015: Advances in the Science and Applications of SAR Interferometry and Sentinel-1 InSAR Workshop

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Interferometric coherence can be considered as an expression of temporal decorrelation. It is understood that interferometric coherence decreases with time between SAR acquisitions because of changes in surface reflectivity, reducing the quality of SAR phase measurements. This is an intrinsic characteristic of the design of SAR systems that has a significant contribution at longer time scales. Although in the past there was not sufficient amount of SAR data to extract robust statistical metrics for decorrelation, in the present study it is demonstrated that tailored analysis of interferometric coherence exploiting the large SAR archive available by the European Space Agency (ESA), enables the accurate quantification of temporal decorrelation. A methodology to translate the observed rate of coherence loss into decorrelation times over a volcanic landscape, namely the Santorini volcanic complex is the subject treated in this study. Specifically, a sensitivity analysis was performed on a large data stack of interferometric pairs to quantify at a pixel level the time beyond which the interferometric phase becomes practically unusable due to the effect of decorrelation. Though the dependence of decorrelation on various land cover/use types is already documented the provision of additional information regarding the expected time of decorrelation is of practical use especially when EO data are utilized in operational activities. The performed analysis is viewed within the improved capacity of current and future SAR systems, while underlining the necessity for exploitation of archive data.

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