基于近地面高光谱影像的冬小麦日光诱导叶绿素荧光提取与分析

摘要

结合FluorMOD模型模拟数据与利用光谱分辨率3.3nm、光谱采样间隔为0.71～0.74 nm近地面成像高光谱系统获取的抽穗期小麦高光谱影像比较3种基于夫琅和费线暗线的提取方法(FLD,3FLD和iFLD)的精确性和稳定性.结果表明当光谱分辨率为3.3nm时,在760 m附近的O2-A波段可以有效提取日光诱导叶绿素荧光,而在687 nm附近的O2-B波段不适合.当存在噪声时,FLD和3FLD的稳定性高于iFLD,FLD倾向于高估荧光值.%Dataset simulated with FluorMOD and images of wheat in heading stage taken by a ground-based hyperspectral imaging system with 3.3 nm spectral resolution and 0.71～0.74 nm spectral sampling interval were used test the feasibility and accuracy of three FLD methods (named FLD,3FLD and iFLD).The results show that when spectral resolution is 3.3 nm,solarinduced chlorophyll fluorescence could be extracted effectively in O2-A band (around 760 nm) instead of O2-B band (around 687nm).As to the extraction results of data with noises,both FLD and 3FLD are stabler than iFLD method.The results of FLD tend to be higher than true value.