SUNGLINT CORRECTION IN AIRBORNE HYPERSPECTRAL IMAGES OVER INLAND WATERS

  • Annia Susin Streher Instituto Nacional de Pesquisas Espaciais (INPE) Divisão de Processamento de Imagens, Caixa Postal 515, 12245-970, São José dos Campos, SP, Brazil
  • Cláudio Clemente Faria Barbosa Instituto Nacional de Pesquisas Espaciais (INPE) Divisão de Processamento de Imagens, Caixa Postal 515, 12245-970, São José dos Campos, SP, Brazil
  • Lênio Soares Galvão Instituto Nacional de Pesquisas Espaciais (INPE) Divisão de Sensoriamento Remoto, Caixa Postal 515, 12245-970, São José dos Campos, SP, Brazil
  • James A. Goodman HySpeed Computing PO Box 431824, Miami, FL 33243, USA
  • Evlyn Marcia Leão de Moraes Novo Instituto Nacional de Pesquisas Espaciais (INPE) Divisão de Sensoriamento Remoto, Caixa Postal 515, 12245-970, São José dos Campos, SP, Brazil
  • Thiago Sanna Freire Silva Universidade Estadual Paulista Júlio de Mesquita Filho, Instituto de Geociências e Ciências Exatas de Rio Claro, Departamento de Geografia

Resumo

This study assessed sunglint effects in airborne high spatial and high spectral resolution images acquired by the SpecTIR sensor under different view-illumination geometries over the Brazilian Ibitinga reservoir (Case II waters). These effects were corrected using the Goodman et al. (2008) and the Kutser et al. (2009) methods, and a variant that used the continuum removal technique to calculate the oxygen absorption band depth. The performance of each method to removing sunglint effects was evaluated by a quantitative analysis of pre- and post-sunglint correction reflectance values (residual reflectance images). Furthermore, the analysis was supported by inspection of the reflectance differences along transects placed over homogeneous masses of waters or over specific portions of the scenes affected and non-affected by sunglint. Results showed that the algorithm of Goodman et al. (2008) produced better results than the other two methods, as it approached to zero the amplitude of the reflectance values between homogenous water masses free and contaminated by sunglint. The Kutser et al. (2009) method had also good performance, except for the most contaminated sunglint portions of the scenes. When the continuum removal technique was incorporated to the Kutser et al. (2009) method, results varied with the scene and were more sensitive to atmospheric correction artifacts and instrumental signal-to-noise ratio.

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Publicado
2015-05-05
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SUSIN STREHER, A.; CLEMENTE FARIA BARBOSA, C.; SOARES GALVÃO, L.; A. GOODMAN, J.; MARCIA LEÃO DE MORAES NOVO, E.; SANNA FREIRE SILVA, T. SUNGLINT CORRECTION IN AIRBORNE HYPERSPECTRAL IMAGES OVER INLAND WATERS. Revista Brasileira de Cartografia, v. 66, 5 maio 2015.