An Atmospheric Correction Algorithm for Remote Sensing of Bright Coastal Waters Using MODIS Land and Ocean Channels in the Solar Spectral Region
An Atmospheric Correction Algorithm for Remote Sensing of Bright Coastal Waters Using MODIS Land and Ocean Channels in the Solar Spectral Region
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DOI：
10.1109/tgrs.2007.895949
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发表时间：
2007-05
影响因子：
8.2
通讯作者：
B. Gao;M. Montes;Rong-Rong Li-Rong;H. Dierssen;C. Davis
中科院分区：
文献类型：
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作者：
B. Gao;M. Montes;Rong-Rong Li-Rong;H. Dierssen;C. Davis
目前使用中分辨率成像光谱辐射计（MODIS）成像数据进行多通道海洋颜色遥感的大气校正算法在清澈的海洋上效果良好，但在明亮的沿海水域可能会产生不正确的结果。这是因为：1)以0.75和0.86 ma为中心的两个大气校正通道的浑浊水并不暗；2)海洋颜色通道（0.488、0.531和0.551）经常在明亮的沿海水域饱和。本文介绍了一种多通道沿海水域遥感大气校正算法。该算法是对我们先前开发的高光谱数据大气校正算法的改进，该算法使用由矢量辐射传输代码和多层大气模型生成的查找表。气溶胶模式和光学深度由光谱匹配技术确定，该技术利用波长长于0.86 μ m的通道，而海洋表面是暗的。根据导出的气溶胶模式和光学深度估计可见光谱区域的气溶胶信息。可见光光谱区域的水残留辐射是通过从卫星测量的总辐射中减去大气路径辐射得到的。介绍了该算法在两个MODIS数据集上的应用，并与现场测量结果进行了比较。在较亮的浅海水域，用该算法获得的离水反射率与现场测量结果非常接近。此外，反演的深海水域的留水反射率与MODIS运算算法得到的结果比较好
The present operational atmospheric correction algorithm for multichannel remote sensing of ocean color using imaging data acquired with the Moderate Resolution Imaging Spectroradiometer (MODIS) works well over clear ocean but can give incorrect results over brighter coastal waters. This is because: 1) the turbid waters are not dark for the two atmospheric correction channels centered near 0.75 and 0.86 mum; and 2) the ocean color channels (0.488, 0.531, and 0.551 mum) often saturate over bright coastal waters. Here, we describe an atmospheric correction algorithm for multichannel remote sensing of coastal waters. This algorithm is a modification of our previously developed atmospheric correction algorithm for hyperspectral data that uses lookup tables generated with a vector radiative transfer code and multilayered atmospheric models. Aerosol models and optical depths are determined by a spectrum-matching technique utilizing channels located at wavelengths longer than 0.86 mum, where the ocean surface is dark. The aerosol information in the visible spectral region is estimated based on the derived aerosol models and optical depths. Water-leaving radiances in the visible spectral region are obtained by subtracting out the atmospheric path radiances from the satellite-measured total radiances. Applications of the algorithm to two MODIS data sets are presented and compared to field measurements. The water-leaving reflectances retrieved with this algorithm over brighter shallow coastal waters compare closely with those from field measurements. In addition, the retrieved water-leaving reflectances over deeper ocean waters compare well with those derived with the MODIS operational algorithm