Practical method of atmospheric correction of SeaWiFS imagery for turbid coastal and inland waters
Practical method of atmospheric correction of SeaWiFS imagery for turbid coastal and inland waters
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DOI：
10.1117/12.466084
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发表时间：
2003-05
期刊：
影响因子：
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通讯作者：
Xianqiang He;D. Pan
中科院分区：
文献类型：
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作者：
Xianqiang He;D. Pan
本工作为出现负离水辐射的浑浊沿海和内陆水域提供了一种实用的大气校正方法。本方法利用了在412 nm处归一化留水亮度随浊度的增加而增加很少的特性。因此，在非常浑浊的沿海和内陆水域，我们可以使用412 nm的瑞利校正反射率来估计865 nm的气溶胶散射反射率。通过几个实例的仿真验证了新算法的性能。结果表明，SeaWiFS前6个波段遥感反射率的反演误差通常小于10%。该算法还在长江口和杭州湾等含沙量非常大的大气条件下进行了试验，而标准的SeaWiFS大气校正算法由于大气校正失败而产生了掩膜。结果表明，这种简单的方法可以有效地减小离水辐射的误差。
This work provides a practical method of atmospheric correction for turbid coastal and inland waters where the negative water-leaving radiance occurs. The present method use the property that normalized water-leaving radiance at 412 nm is increase very little with the increasing of turbidity. Thus, in very turbid coastal and inland water, we can use Rayleigh-corrected reflectance at 412 nm to estimate the aerosol scattering reflectance at 865 nm. The performance of the new algorithm is tested with simulation for several cases. It is found that the retrieved remote sensing reflectance is usually in error by <10% for the first six bands of SeaWiFS. This new algorithm is also tested under various atmospheric conditions over the mouth of Changjiang river and Hangzhou bay where the sediment concentration is very high and the standard SeaWiFS atmospheric correction algorithm creates a mask due to atmospheric correction failure. The result proved the efficiency of this simple method in reducing the errors of the water-leaving radiance.