Appraisal of dual polarimetric radar vegetation index in first order microwave scattering algorithm using sentinel – 1A (C - band) and ALOS - 2 (L - band) SAR data
2022
Yadav, Vijay Pratap | Prasad, Rajendra | Bala, Ruchi | Srivastava, Prashant K. | Vanama, V. S. K.
The dual polarimetric study including degree of polarization () and energy span (λ₁+ λ₂) for vegetation targets infer the accuracy of vegetation algorithms. The Sentinel − 1 A and ALOS − 2 satellite data were utilized for dual polarimetric radar vegetation index (DPRVI), polarimetric radar vegetation index (PRVI) and radar vegetation index (RVI) computation and simulation of backscattering coefficient (σ⁰ (dB)) at VV polarization. The DPRVI, PRVI and RVI were computed at VV + VH and HH + HV polarizations, respectively. The simulation of σ⁰ (dB) at HH + HV can be show better results than VV + VH polarization using derived radar vegetation descriptors (V). The DPRVI, PRVI and RVI showed higher R² and lower RMSE values at L – band than C - band. The DPRVI at L – band (HH + HV polarization) was indicated highest R² = 0.91 and lower RMSE = 0.31 (dB) among all proposed V in the algorithm.
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