Reconstruction of vertical profiles of inherent optical properties from upwelling water radiances / Recuperação de perfis verticais de propriedades óticas inerentes a partir da radiação emergente da água

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

The current work proposes a metodology for the reconstruction of inherent optical properties of natural waters, vertical profiles of the absorption and scattering coefficients, from multispectral radiometric data of the radiation emerging from water. The radiative transfer direct model is solved by the LTSN method and bio-optical models are employed to correlate the absorption and scattering coefficients to the chlorophyll concentration in the water. The corresponding inverse problem is formulated as an optimization problem and iteratively solved by a metaheuristics inspired on the behavior of ants, the Ant Colony Optimization method. It was included a new intrinsic regularization scheme that pre-selects candidate solutions at every iteration based on their smoothness. Several reconstructions of the chlorophyll concentration profile were performed using noiseless and noisy synthetic data related to (i) in situ radiances with and without azimuthal symmetry, and (ii) emerging multispectral radiances. These reconstructions yielded good quality solutions. Furthermore, parallel versions of the LTSN method and of the optimizer were implemented.

ASSUNTO(S)

computer science problemas inversos computaÇÃo aplicada inverse problems ant colony optimization otimização por colônia de formigas Ótica hidrológica hydrologic optics processamento paralelo parallel computing

ACESSO AO ARTIGO

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