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TitleMultibaseline PolInSAR using Radarsat-2 quad-pol data: monitoring deformation in the San Francisco Bay area
AuthorAlipour, S; Tiampo, K F; Samsonov, SORCID logo; González, P J
Source33rd Canadian Symposium on Remote Sensing, abstracts; by Canadian Symposium on Remote Sensing; 2012 p. 31 Open Access logo Open Access
LinksOnline - En ligne
LinksAbstracts (PDF, 1.22 MB)
Alt SeriesEarth Sciences Sector, Contribution Series 20140080
Meeting33rd Canadian Symposium on Remote Sensing; Ottawa; CA; June 11-14, 2012
Mediaon-line; digital
File formatpdf
AreaSan Francisco; California; United States of America
Lat/Long WENS-123.0000 -122.0000 38.0000 37.5000
Subjectsgeophysics; remote sensing; satellite imagery; deformation; analytical methods; Hayward fault
Released2012 01 01
AbstractDifferential Interferometric SAR (DInSAR) techniques are developed in order to measure ground deformation. However, DInSAR effectiveness dramatically reduces in natural terrains due to the low density of suitable pixels. An alternative to address this problem is through the increase of pixel coherence, which results in a higher phase stability. Polarimetric coherence optimization enhances the pixel coherence based on analysis of the scattered signal. In recent years, fully polarimetric SAR images have been available as a result of the launch of satellites such as Radarsat-2. Here, we apply an Equal Scattering Mechanism Multibaseline (ESM-MB) coherence optimization technique on 28 C-band Radarsat-2 images in both ascending and descending mode to increase the interferometric coherence. We then use statistical analysis to separate the image pixels into two categories; pixels with enhanced noise induced by optimization problem and pixels with a solution based on a physical reality. The latter is of interest for DInSAR processing of ground deformation estimation. Statistical analysis to mark the latter group is a mandatory step in PolInSAR processing, especially in natural terrains where the depolarization effect of the scattered wave is more dominant. Finally, the optimized channels are used for interferometric analysis and generation of deformation maps in the San Francisco region, where the Hayward fault presents a high risk of seismic hazard. The results confirm that using a full polarization of SAR images favors a better estimation of deformation phenomena both in terms of coverage and phase stability.

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