| Titre | Multibaseline PolInSAR using Radarsat-2 quad-pol data: monitoring deformation in the San Francisco Bay area |
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| Auteur | Alipour, S; Tiampo, K F; Samsonov, S ; González, P J |
| Source | 33rd Canadian Symposium on Remote Sensing, abstracts; par Canadian Symposium on Remote Sensing; 2012 p. 31  Accès ouvert |
| Liens | Online - En ligne
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| Liens | Abstracts (PDF, 1.22 MB)
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| Année | 2012 |
| Séries alt. | Secteur des sciences de la Terre, Contribution externe 20140080 |
| Réunion | 33rd Canadian Symposium on Remote Sensing; Ottawa; CA; juin 11-14, 2012 |
| Document | livre |
| Lang. | anglais |
| Media | en ligne; numérique |
| Formats | pdf |
| Région | San Francisco; California |
| Lat/Long OENS | -123.0000 -122.0000 38.0000 37.5000 |
| Sujets | télédétection; imagerie par satellite; déformation; méthodes analytiques; géophysique |
| Résumé | (disponible en anglais seulement)
Differential 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. |
| GEOSCAN ID | 294591 |
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