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Remote Sens. 2015, 7(11), 15424-15442; doi:10.3390/rs71115424

Polarimetric Scattering Properties of Landslides in Forested Areas and the Dependence on the Local Incidence Angle

1
Graduate School of Science and Technology, Niigata University, 8050 Ikarashi 2-no-cho, Nishi-ku, Niigata 950-2108, Japan
2
Faculty of Engineering, Niigata University, 8050 Ikarashi 2-no-cho, Nishi-ku, Niigata 950-2108, Japan
*
Author to whom correspondence should be addressed.
Academic Editors: James Jin-King Liu, Yu-Chang Chan, Zhong Lu and Prasad S. Thenkabail
Received: 27 August 2015 / Revised: 2 November 2015 / Accepted: 10 November 2015 / Published: 18 November 2015
(This article belongs to the Special Issue Remote Sensing in Geology)
View Full-Text   |   Download PDF [1619 KB, uploaded 18 November 2015]   |  

Abstract

This paper addresses the local incidence angle dependence of several polarimetric indices corresponding to landslides in forested areas. Landslide is deeply related to the loss of human lives and their property. Various kinds of remote sensing techniques, including aerial photography, high-resolution optical satellite imagery, LiDAR and SAR interferometry (InSAR), have been available for landslide investigations. SAR polarimetry is potentially an effective measure to investigate landslides because fully-polarimetric SAR (PolSAR) data contain more information compared to conventional single- or dual-polarization SAR data. However, research on landslide recognition utilizing polarimetric SAR (PolSAR) is quite limited. Polarimetric properties of landslides have not been examined quantitatively so far. Accordingly, we examined the polarimetric scattering properties of landslides by an assessment of how the decomposed scattering power components and the polarimetric correlation coefficient change with the local incidence angle. In the assessment, PolSAR data acquired from different directions with both spaceborne and airborne SARs were utilized. It was found that the surface scattering power and the polarimetric correlation coefficient of landslides significantly decrease with the local incidence angle, while these indices of surrounding forest do not. This fact leads to establishing a method of effective detection of landslide area by polarimetric information. View Full-Text
Keywords: synthetic aperture radar (SAR); polarimetry; power decomposition; co-polarization correlation coefficient; local incidence angle; landslide synthetic aperture radar (SAR); polarimetry; power decomposition; co-polarization correlation coefficient; local incidence angle; landslide
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Shibayama, T.; Yamaguchi, Y.; Yamada, H. Polarimetric Scattering Properties of Landslides in Forested Areas and the Dependence on the Local Incidence Angle. Remote Sens. 2015, 7, 15424-15442.

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