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An Analysis of Coherence Optimization Methods in Compact Polarimetric SAR Interferometry Meng Liu,Hong Zhang,Chao Wang, Bo Zhang Vancouver, Canada July 29, 2011 IGRASS2011

Outline Introduction 1 2 3 Coherence Optimization of C-PolInSAR 4 Conclusions Experiments and Results

Introduction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Introduction ,[object Object],[object Object],[object Object],[object Object]

Introduction ,[object Object],[object Object],[object Object]

Introduction ,[object Object],[object Object],π/4 mode: Dual Circular Polarimetric mode: right circular transmit, linear (horizontal and vertical) receive (CTLR) mode: C-PolInSAR InSAR CP

Introduction ,[object Object],Simulation Reconstruction ,[object Object],[object Object],[object Object],insignificance

Coherence Optimization ,[object Object],[object Object],the highest correlation of the two images can be selected by tuning the w i polarization in each resolution element

Coherence Optimization ,[object Object],Solving this equation leads to two 2×2 eigenvalue problems [A][B] is similar to [B][A], they have the same real nonnegative eigenvalues.

Coherence Optimization ,[object Object],It assumes the same scattering mechanism in both images The optimization of the magnitude of the complex correlation leads to one 2×2 eigenvalue problems This approach take the same polarization basis transformation, which leads to a suboptimum result.

Coherence Optimization ,[object Object],It provides a new thought to solve the constrained Lagrange multipliers function. Assumption: [T 11 ] is similar to [T 22 ] The maximum coherence corresponds to the numerical radius of the matrix [A] Define

Experiments and Results ,[object Object],[object Object],[object Object],[object Object],The Pauli decomposition result 1 2 3 4 5 Areas Color Forest-1 1 Forest-2 2 Crop 3 Road 4 Bare Land 5

Experiments and Results (a) FP case (c) DCP mode (b) π/4 mode (d) CTLR mode ,[object Object],[object Object],[object Object]

Conventional Coherence VS FP Coherence Mean Coherence Values for Compact Polarimetric Modes ,[object Object],[object Object],[object Object],[object Object],ROI Conventional Coherence FP Coherence HH HV VV HH+VV HH-VV ULM NR CLM forest 1 0.770 0.734 0.780 0.793 0.721 0.913 0.876 0.861 forest 2 0.809 0.774 0.796 0.817 0.750 0.924 0.892 0.870 crop 0.813 0.748 0.797 0.819 0.724 0.931 0.900 0.893 road 0.632 0.382 0.616 0.673 0.509 0.818 0.766 0.751 bare land 0.846 0.707 0.845 0.898 0.635 0.931 0.901 0.890 ROI Lin45 DCP CTLR ULM NR CLM ULM NR CLM ULM NR CLM forest 1 0.851 0.830 0.816 0.865 0.843 0.831 0.862 0.839 0.824 forest 2 0.874 0.855 0.836 0.880 0.863 0.845 0.881 0.861 0.846 crop 0.883 0.861 0.852 0.887 0.868 0.860 0.887 0.866 0.857 road 0.729 0.702 0.681 0.732 0.701 0.683 0.719 0.681 0.656 bare land 0.895 0.881 0.872 0.893 0.878 0.868 0.900 0.881 0.870

Conclusions 1 Compared with the FP case, one can observe that there is a significant loss in coherence of 5-10% when CP modes are available. 2 The trend of the coherence histograms for CP case is closed to the corresponding FP case, no matter which method or CP mode was selected. 3 It is shown that the degree of coherence from CP case carries enough information for some polarimetric SAR interferometry applications .

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IGARSS2011_PPT_Liumeng.ppt

1. An Analysis of Coherence Optimization Methods in Compact Polarimetric SAR Interferometry Meng Liu,Hong Zhang,Chao Wang, Bo Zhang Vancouver, Canada July 29, 2011 IGRASS2011

2. Outline Introduction 1 2 3 Coherence Optimization of C-PolInSAR 4 Conclusions Experiments and Results

10.

11.

12.

13.

14.

15.

16. Conclusions 1 Compared with the FP case, one can observe that there is a significant loss in coherence of 5-10% when CP modes are available. 2 The trend of the coherence histograms for CP case is closed to the corresponding FP case, no matter which method or CP mode was selected. 3 It is shown that the degree of coherence from CP case carries enough information for some polarimetric SAR interferometry applications .

17.

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