NDLI: An improved four-component decomposition with distributed double-bounce scattering model

Content Provider	IEEE Xplore Digital Library
Author	Jiehong Chen Hong Zhang Chao Wang
Copyright Year	2012
Description	Author affiliation: Key Laboratory of Digital Earth, Center for Earth Observation and Digital Earth, CAS, Beijing, China (Jiehong Chen; Hong Zhang; Chao Wang)
Abstract	This paper proposes an improved four-component scattering decomposition scheme with modified double-bounce scattering model for the analysis of polarimetric synthetic aperture radar (POLSAR) data. In the Yamaguchi decomposition, it occurs occasionally for some pixels with negative surface scattering power Ps and/or negative diplane scattering power Pd because the whole HV cross-polarized component is assigned to volume scattering due to vegetation; and it is also difficult to discriminate man-made buildings not orthogonal to the radar LOS from vegetation. In advance the conditions of the emergence of negative powers in the Yamaguchi decomposition are given out, and three corresponding processing methods adopted in many improved four-component target decompositions are reviewed in the paper. Then the expression of the coherency matrix of distributed dielectric dihedral corner reflectors is derived. The expression demonstrates that distributed dielectric dihedral corner reflectors also will generate HV cross-polarized component. The new target decomposition utilizes the new double bounce model of distributed dielectric dihedral corner reflectors instead of the original one adopted by the Freeman and Yamaguchi decompositions. In order to solve the new decomposition, we introduce normalize circular-pol correlation coefficients to characterize the percentage of HV scattering component generated by distributed dielectric dihedral corner reflectors. An airborne L band quad-pol data acquired by DLR ESAR sensor over Oberpfaffenhoffen in German are applied to the improved decomposition scheme. Experimental results demonstrate that the new decomposition method can reduce the pixels with negative powers and obtain correct scattering mechanisms of non-reflection structures not paralleled to the flight path.
Starting Page	344
Ending Page	349
File Size	1816492
Page Count	6
File Format	PDF
ISBN	9781467312721
e-ISBN	9781467312745
DOI	10.1109/CVRS.2012.6421287
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-12-16
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Analytical models Atmospheric modeling Distributed databases Scattering Nomalized circular-pol correlation coefficients POLSAR decomposition Cities and towns Distributed dielectric dihedral corner reflectors
Content Type	Text
Resource Type	Article

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