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Abstract
An atmospheric correction algorithm (the improved ‘clear water’ atmospheric correction algorithm for broadband (ICAB) sensors, or ‘ICAB’ algorithm) was constructed and tested, and the results are presented in this article. The Rayleigh scattering contributions at three visible bands and one near-infrared (NIR) band were estimated using the look-up table method. The remote-sensing reflectance associated with aerosol scattering at the NIR band was estimated using the ‘clear water’ method. The Ångström exponential model was used to extrapolate the aerosol scattering contribution from the NIR bands into visible bands. The spectral slopes of remote-sensing reflectance between 485 and 560 nm were developed for estimating the exponential coefficient of the Ångstrom exponential model. According to the case study performed in Taihu Lake, China, the results of which are presented in this article, it has been found that the spectral characteristics in shape and magnitude estimated by the ICAB algorithm are quite similar to the typical spectral characteristics of water bodies. The uncertainties of the ICAB algorithm were 7.45%, 10.57%, 13.51%, and 17.14%, respectively, at 485, 560, 660, and 830 nm.
Acknowledgements
This study is supported by the Science Foundation for 100 Excellent Youth Geological Scholars of China Geological Survey (GZH201200036), open fund of Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology (MRE201109), High-tech Research and Development Programme of China (2007AA092102), and Dragon 3 Project (10470). We would like to just express our gratitude to three anonymous reviewers for their useful comments and suggestions.