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Introduction

 

Improvement of Vegetation Parameter Retrieval from Polarimetric SAR Interferometry using a Simple Polarimetric Scattering Model

Maxim Neumann(1), Laurent Ferro-Famil(1) and Andreas Reigber(2)

(1) University of Rennes 1, 263 Avenue General Leclerc, 35042 Rennes, France
(2) German Aerospace Center (DLR), Microwave and Radar Institute, Oberpfaffenhofen, Germany

Abstract

In this paper, we propose to utilize a simple polarimetric model for polarimetric SAR interferometry (PolInSAR) vegetation parameter retrieval. The combination of polarimetric decompositions with PolInSAR parameter inversion approaches enables us to overcome some of the limitations of the individual techniques and to resolve severe ambiguities. On the one hand, it will be shown how the addition of interferometry (especially in single--transmit acquisition mode) helps to separate surface from the double--bounce and the volume scattering components. On the other hand, when using a polarimetric decomposition for PolInSAR applications and having separated the volume component from the other components enables us to reliably estimate the ground--to--volume power ratio. It is a key parameter in the developed PolInSAR parameter inversion approach which will be presented. After obtaining the ground--to--volume ratio one is able to reliably estimate the extinction in the vegetation medium, as well as the vegetation height, ground topography phase, vegetation characteristics such as the particle anisotropy, the degree of orientation randomness, and the main orientation direction. This approach has been validated on simulated and real SAR data and initial results will be presented. In particular, next to the vegetation height and other parameters, we were able to obtain robust estimates for the extinction coefficients and the ground--to--volume power ratios for different forest types. The applications for the presented model and the parameter inversion approach are manifold: vegetation and surface parameter estimation, classification, monitoring, etc.

 

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  Higher level                 Last modified: 07.05.06