Wang Menghua, Shi Wei
Opt Express. 2007 Nov 26;15(24):15722-33. doi: 10.1364/oe.15.015722.
A method of ocean color data processing using the combined near-infrared (NIR) and shortwave infrared (SWIR) bands for atmospheric correction for the Moderate Resolution Imaging Spectroradiometer (MODIS) on Aqua is proposed. MODIS-Aqua has been producing the high quality ocean color products in the open oceans, but there are still some significant errors in the derived products in the coastal regions. With the proposed NIR-SWIR combined algorithm, MODIS ocean color data can be processed using the standard (NIR) atmospheric correction algorithm for the open oceans, whereas for the turbid waters in the coastal region the SWIR atmospheric correction algorithm can be executed. The turbid water index developed by Shi and Wang (2007) (Remote Sens. Environ. 110, 149-161 (2007)) is computed prior to the atmospheric correction for the identification of the productive and/or turbid waters where the SWIR algorithm can be operated. For non-turbid ocean waters (discriminated using the turbid water index criterion), the MODIS data are still processed using the standard (NIR) algorithm. The NIR-SWIR combined algorithm has been tested and evaluated. Two examples from MODIS-Aqua measurements along the U.S. and China east coast regions show improved ocean color products with the new approach. In particular, there are no obvious data discontinuities between using the NIR and SWIR methods. Therefore, with the NIR-SWIR combined approach for the MODIS ocean color data processing, good quality ocean color products can be derived both in clear (open) oceans as well as for turbid coastal waters.
提出了一种利用近红外（NIR）和短波红外（SWIR）波段组合对Aqua卫星上的中分辨率成像光谱仪（MODIS）进行大气校正的海洋颜色数据处理方法。MODIS-Aqua在开阔海洋中生成了高质量的海洋颜色产品，但在沿海地区的派生产品中仍存在一些显著误差。采用所提出的NIR-SWIR组合算法，MODIS海洋颜色数据可以使用开阔海洋的标准（NIR）大气校正算法进行处理，而对于沿海地区的浑浊水域，可以执行SWIR大气校正算法。在进行大气校正之前，计算Shi和Wang（2007年）（《遥感环境》，第110卷，第149 - 161页（2007年））开发的浑浊水指数，以识别可运行SWIR算法的高产和/或浑浊水域。对于非浑浊海洋水域（使用浑浊水指数标准进行区分），MODIS数据仍使用标准（NIR）算法进行处理。对NIR-SWIR组合算法进行了测试和评估。来自美国和中国东海岸地区的MODIS-Aqua测量的两个例子表明，新方法改进了海洋颜色产品。特别是，使用NIR和SWIR方法之间没有明显的数据不连续性。因此，采用NIR-SWIR组合方法处理MODIS海洋颜色数据，可以在清澈（开阔）海洋以及浑浊沿海水域中获得高质量的海洋颜色产品。
