Calculating the electromagnetic scattering of vegetation by Monte Carlo and CUDA

Zhensen Wu; Xiang Su; Jiaji Wu; Bormin Huang

doi:10.1117/12.903181

12 October 2011 Calculating the electromagnetic scattering of vegetation by Monte Carlo and CUDA

Zhensen Wu, Xiang Su, Jiaji Wu, Bormin Huang

Proceedings Volume 8183, High-Performance Computing in Remote Sensing; 81830W (2011) https://doi.org/10.1117/12.903181
Event: SPIE Remote Sensing, 2011, Prague, Czech Republic

Abstract

Electromagnetic scattering of vegetation is represented by a double-layer model comprising of vegetation layer and ground layer. The vegetation layer is composed of discrete leaves which are approximated as ellipsoids. The ground layer is modeled as a random rough surface. Investigation of the scattering field of a single leaf is carried out first. Then the leaves are divided into different groups depending on their orientation. Considering the incoherent addition property of Stokes parameters, the Stokes matrix and the phase matrix of every group are calculated, adding them eventually to get the total scattering coefficient. In the original CPU-based sequential code, the Monte Carlo simulation to calculate the electromagnetic scattering of vegetation takes 97.2% of the total execution time. In this paper we take advantage of the large-scale parallelism of Compute Unified Device Architecture (CUDA) to create and compute all the groups simultaneously. As a result, a speedup of up to 213x is achieved on a single Fermi-generation NVIDIA GPU GTX 480.

Citation Download Citation

Zhensen Wu, Xiang Su, Jiaji Wu, and Bormin Huang "Calculating the electromagnetic scattering of vegetation by Monte Carlo and CUDA", Proc. SPIE 8183, High-Performance Computing in Remote Sensing, 81830W (12 October 2011); https://doi.org/10.1117/12.903181

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