Comparison of Simulated Backscattering Signal and ALOS PALSAR Backscattering over Arid Environment Using Experimental Measurement

Josaphat Tetuko Sri  Sumantyo; Ryutaro  Tateishi; Saeid  Gharechelou

doi:10.4236/ars.2015.43018

Saeid Gharechelou, Ryutaro Tateishi, Josaphat Tetuko Sri Sumantyo

Abstract: The purpose of this paper is to simulate the backscattered signal by experimental data and field working then, comparing with the backscattered signal from actual L-band SAR data over arid to semi-arid environments. The experimental data included the laboratory-measured dielectric constant of soil samples and the roughness parameter. A backscattering model used to simulate the backscattering coefficient in sparse vegetation land cover. The backscattering coefficient (σ0) simulated using the AIEM (advanced integral equation model) based on the experimental data. The roughness data were considered by the field observation, chain method measuring and photogrammetry simulation technique by stereo image of ground real photography. The simulated backscattering coefficients were compared with the real extracted backscattering coefficient (σ0) from the ALOS PALSAR single and dual polarization mode data. The most problem in backscattering simulation was the vegetation water content. Therefore, the water-cloud model using the water index result of optical data applied on the simulated backscatter model for enhancement the backscattering heterogeneity from vegetation water contents due to the mix pixel of vegetation in spars vegetation. At the results the AIEM model overestimated the backscattering simulation, it might be cause of high sensitivity of this model to roughness. The ALOS PALSAR HV polarization mode is more sensitive than the HH mode to vegetation water content. The water-cloud model could improve the result and the correlation function of the samples was increased but, the difficulties were the input the A and B parameters to model.

Keywords: AIEM, SAR Backscattering, ALOS PALSAR, Sparse Vegetation, Backscattering Simulation, Arid Environment, Dielectric Measurement

Cite this paper: Gharechelou, S. , Tateishi, R. and Sumantyo, J. (2015) Comparison of Simulated Backscattering Signal and ALOS PALSAR Backscattering over Arid Environment Using Experimental Measurement. Advances in Remote Sensing, 4, 224-233. doi: 10.4236/ars.2015.43018.

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