近岸浑浊水体大气校正算法研究进展

Research Progress on the Atmospheric Correction Algorithms of Ocean Color Remote Sensing for Turbid Coastal Waters

大气校正问题是海洋光学遥感的关键技术问题之一。精确的大气校正是实现高精度水色信息反演的前提。I类水体的大气校正算法发展相对成熟,其假设近红外(NIR)波段离水辐亮度为零,从而将NIR波段的大气程辐射外推至可见光(VIS)波段求出离水辐亮度实现大气校正。但是,II类水体由于受到悬浮物(TSM)和黄色物质(CDOM)的影响,其大气校正相对复杂。文中概述了国内外近岸浑浊水体大气校正算法的研究现状及应用效果,总结了各种算法的特点、优势和局限性。文中还提出了浑浊水体大气校正研究需要解决的关键问题,并展望了该领域未来的发展趋势和方向。

Atmospheric correction is one of key techniquesin ocean color remote sensing.The accurate atmospheric correction is the premise of ocean color parameters extraction with high accuracy.For case I waters,the algorithms have already developed into a rather mature stage,it estimates the aerosol scattering radiances from two nearinfrared bands(NIR)based on the assumption that the water-leaving radiances at these twoNIR bands are negligible,and then extrapolate NIR atmospheric path radiance into the visible spectrum(VIS)in the atmosphericcorrection of the imagery.However,in case II waters,due to the total suspended matter(TSM)and colored dissolved organic matter(CDOM),the algorithms are more complex than case I waters.In this paper,the detailed review on domestic and foreign atmospheric correction algorithms for case II waters and application effects are introduced,summarizing a variety of algorithms'features,advantages and limitations,discussing some key issues and benefical suggestions of atmospheric correction of ocean color remote sensing,finally prospecting the future development trends and research directions of this field.