Modification of Ruddick's method for case 2 water atmospheric correction

Yan Li

doi:10.1117/12.466158

8 May 2003 Modification of Ruddick's method for case 2 water atmospheric correction

Yan Li

Proceedings Volume 4892, Ocean Remote Sensing and Applications; (2003) https://doi.org/10.1117/12.466158
Event: Third International Asia-Pacific Environmental Remote Sensing Remote Sensing of the Atmosphere, Ocean, Environment, and Space, 2002, Hangzhou, China

Abstract

Ruddick et al. Applied Optics, 39, 897-912 (2000), have extended the standard SeaWiFS atmospheric correction algorithm for use over turbid coastal and inland waters; however, their assumption of a spatially homogeneous constant ratio for the water-leaving reflectances normalized by the sun-sea atmospheric transmittance at 765 and 865 nm, under the simple b_b/α model, can result in a significant inaccuracy for highly turbid water. Using the more accurate b_b/(α+b_b) model, which, more realistically, does not assume spatial homogeneity ratio, the calculated corresponding perturbation for this assumption is several times larger than what Ruddick et al. evaluated under b_b/α model. Such perturbation-related error could exceed 10% in highly turbid water with R⁽⁸⁾ > 0.05. We suggest using the modified assumption, 1/R⁽⁸⁾=α₀/R⁽⁷⁾ +(1-α₀)/f; instead of Ruddick's assumption, in SeaWiFS atmospheric correction algorithms for turbid waters. The Maclaurin seriers expansion of such modified assumption is expressed as, R⁽⁸⁾=α₀)^-1[R⁽⁷⁾+(α₀-1)α₀^-1f¹R⁽⁷⁾²+(α₀-1)²α₀^-2f²R⁽⁷⁾³+.....]; -1<(α₀-1)α₀^-1f¹R^(7)<1 Calibration of α₀, an IOPs related regional parameters, is determined on an image-by-image basis from regressive empirical relationship of scatterplot of the-Rayleigh-corrected reflectances for these two bands. The calculated corresponding perturbation for Ruddick's second assumption is several times larger than what Ruddick et al. evaluated under simple b_b/α model. Such perturbation-related error could reach 20% for the highly turbid water over the Pearl River estuary.

Citation Download Citation

Yan Li "Modification of Ruddick's method for case 2 water atmospheric correction", Proc. SPIE 4892, Ocean Remote Sensing and Applications, (8 May 2003); https://doi.org/10.1117/12.466158

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