Detecção de zonas de alteração hidrotermal no greenstone belt Rio Itapicuru, BA, atraves de tecnicas de processamento digital Geoscan AMSS MK-II

AUTOR(ES)
DATA DE PUBLICAÇÃO

1997

RESUMO

In this work it is presented an inexact Newton method by a new choice for the forcing term. A globalization of the new method is done by introducing a robust line search strategy. Convergence properties are proved. The inexact Newton step is obtained through the restarted GMRES, GMRES (m), applied for solving the linear systems. Numerical experiments showed a stagnation of the GMRES (m) and also an occurrence of a great increase in the norm of the function at the initial iterations. Some strategies were proposed to avoid these drawbacks. These strategies are characterized by their simplicity of implementation and also by the fact that they do not need internal modifications of the GMRES algorithm. So, the interaction with available softwares are trivial. A bunch of numerical experiments were performed. With them it can be concluded that the new choice for the forcing term and the strategies incorporated in the algorithm were successfull. The resulting algorithm is then robust and has global convergence property with supelinear convergence rate.

ASSUNTO(S)

sensoriamento remoto espectrometria processamento de imagens - tecnicas digitais

ACESSO AO ARTIGO

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