Abstract
A modified volume scattering model for Freeman-Durden three-component decomposition is proposed in this study. Due to the inconsistency between uniform oriented dipole mode and the actual volume scattering mechanism for terrain types, the power of surface scattering and double-bounce scattering are occasionally negative. We established the volume scattering model using dipoles with two dominant orientations and proved it can decrease the probability of negative power occurrence in mathematics. The new volume scattering model is better to mimic the building with sloped roofs. We carried out three-component decomposition with proposed volume scattering model and other three models respectively using the L-band AIRSAR polarimetric SAR data. The results show that the pixels with negative powers are significantly decreased by our model and thus the effectiveness of the new model are demonstrated. In particular, the proposed volume scattering model work well in the forest and oriented building areas.
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