Abstract
The cross-polarized scattering (HV) of polarimetric synthetic aperture radar (PolSAR) data is caused not only by forest but also by urban buildings with azimuth orientation angles. Since the general double scattering in model-based decomposition does not support their dominant scattering mechanism, it’s still a challenge for modeling the scattering mechanism of oriented buildings. In this paper, the HV induced by oriented buildings is modeled by a rotated dihedral corner reflector. The cross scattering matrix of oriented building is obtained by averaging a cosine squared distribution with its peak at the dominant polarimetric orientation angle (DPOA) of an area and an adaptive width. The relation between DPOA and distribution width is acquired. Then an optimization strategy which eliminates the negative power and balances time and efficiency is proposed to estimate the scattering contributions. The proposed algorithm is tested on AIRSAR data of San Francisco and UAVSAR of San Diego and the results confirm the effectiveness.
Highlights
Due to high resolution and all time and weather condition, polarimetric synthetic aperture radar (PolSAR) images are widely used in remote sensing applications such as urban area classification, disaster assessment and forest estimation [1]–[5]
It is still a challenge to analyze urban area based on the decomposition results due to the PolSAR images sensitivity to the building azimuth orientation angle (AOA)
For model-based decomposition of PolSAR data, urban buildings are often modeled by double scattering
Summary
Due to high resolution and all time and weather condition, PolSAR images are widely used in remote sensing applications such as urban area classification, disaster assessment and forest estimation [1]–[5]. Model-based decomposition method is an efficient approach for PolSAR data analysis [6]–[21]. The basic idea of model-based decomposition is that PolSAR data is the combination of the different scattering mechanisms. In most of the decomposition methods, cross polarized scattering is assumed to be caused by vegetation. It is still a challenge to analyze urban area based on the decomposition results due to the PolSAR images sensitivity to the building azimuth orientation angle (AOA). It has been proved that cross polarized scattering is caused by vegetation and by oriented buildings.
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