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Atmospheric correction for HY-1A CCD in Case 1 waters

机译:案例1水域中HY-1A CCD的大气校正

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摘要

In this paper, 2 kinds of atmospheric correction (AC) algorithms are presented for HY-1A CCD in Case 1 waters based on radiative transfer (RT) simulation: algorithms using lookup tables (LUTs) and algorithms using neutral network (NN), and are evaluated and compared. The LUTs AC algorithms consist of 4 aerosol correction algorithms based on 2 kinds of aerosol lookup tables: τ_a reversible γ LUTs and ρ_(as) reversible ρ_A LUTs. When applied to simulated data, the algorithm based on the τ_a reversible γ LUTs performs the best. The NN AC algorithms are also successfully applied to simulated data, and not sensitive to randomly added noise of ±5%. Compared with LUTs algorithms, the NN algorithms have the highest R~2 and lowest RMSE, and have better interpolating ability among different aerosol models. Because of its high speed of data processing, the NN algorithm is another good choice for atmospheric correction in Case 1 waters.
机译:本文基于辐射传输(RT)模拟,提出了案例1水域中HY-1A CCD的两种大气校正(AC)算法:使用查找表(LUT)的算法和使用中性网络(NN)的算法,以及进行评估和比较。 LUTs AC算法由基于两种气溶胶查找表的4种气溶胶校正算法组成:τ_a可逆γLUT和ρ_(as)可逆ρ_ALUT。当应用于模拟数据时,基于τ_a可逆γLUT的算法表现最佳。 NN AC算法也已成功应用于模拟数据,并且对±5%的随机添加噪声不敏感。与LUTs算法相比,NN算法具有最高的R〜2和最低的RMSE,并且在不同的气溶胶模型之间具有更好的内插能力。由于其高速的数据处理,NN算法是案例1水域中大气校正的另一个不错的选择。

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