Polarimetric differential SAR interferometry in an arid natural environment

Adugna Mullissa, Valentyn Tolpekin, Alfred Stein, Daniele Perissin

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Abstract

Ground deformation measurements have contributed to a better understanding of the processes and mechanisms involved in natural hazards. Those include landslides, subsidence, earthquakes and volcanic eruptions. Spaceborne Differential Interferometric Synthetic Aperture RADAR (DInSAR) is a well studied technique for measuring ground deformation. Quality of deformation measurements, however, is often degraded by decorrelation. With the advent of fully polarimetric SAR satellite sensors, polarimetric optimization techniques exploiting polarimetric diversity improve the phase quality of interferograms. In this paper, we analyzed three polarimetric optimization methods to determine the optimal one for application in an arid natural environment. We considered coherence decomposition in single and double phase center scenarios. Coherence estimation bias associated with each optimization method has been analyzed. We compared the derived displacement values with terrestrial GPS measurements. The study shows that polarimetric optimization increases the number of coherent pixels by upto 6.89% as compared with a single polarization channel. The study concludes that polarimetric optimization coupled with DInSAR analysis yields more reliable deformation results in a low coherence region.
Original languageEnglish
Pages (from-to)9-18
JournalInternational Journal of Applied Earth Observation and Geoinformation (JAG)
Volume59
DOIs
Publication statusPublished - 2017

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Keywords

  • ITC-ISI-JOURNAL-ARTICLE

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