Gram-Schmidt orthogonalization technique for atmospheric and sun glint correction of Landsat imagery

Charles L. Walker; Maria T. Kalcic

doi:10.1117/12.196778

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30 December 1994 Gram-Schmidt orthogonalization technique for atmospheric and sun glint correction of Landsat imagery

Charles L. Walker, Maria T. Kalcic

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Proceedings Volume 2315, Image and Signal Processing for Remote Sensing; (1994) https://doi.org/10.1117/12.196778
Event: Satellite Remote Sensing, 1994, Rome, Italy

Abstract

A technique for correcting for haze and sunglint in Landsat Thematic Mapper imagery in coastal regions has been developed and demonstrated using Gram-Schmidt orthogonalization of the band covariance matrix. This procedure is an adaptation of Wiener filtering and noise cancellation stochastic signal processing. Using a covariance matrix constructed from an over water portion of the image containing haze and sunglint pixels, a transfer function between infrared (IR) bands (e.g. TM 5) and visible bands (e.g. TM 2) is derived. This transfer function is then applied to the entire image and the visible band contribution predicted by the IR is subtracted from the measured visible signal, pixel by pixel. A comparison between images with and without haze of the same scene indicates that the procedure allows the observation of underwater features not previously visible.

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Charles L. Walker and Maria T. Kalcic "Gram-Schmidt orthogonalization technique for atmospheric and sun glint correction of Landsat imagery", Proc. SPIE 2315, Image and Signal Processing for Remote Sensing, (30 December 1994); https://doi.org/10.1117/12.196778

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