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为了分析土壤含水量对双向反射的影响以及反演土壤含水量,研究了基于野外实测多角度高光谱数据,获取了双向反射模型的参数,并且通过模型计算值反演土壤含水量。通过分析在3个波段以及不同角度反演的模型参数与含水量之间的关系,发现在不同角度利用模型反演土壤含水量的结果具有差异性;并且在865 nm处反演精度最稳定。这表明利用双向反射分布特性能够以较高的精度反演土壤含水量,同时也应该考虑方向反射对反演精度的影响。
In order to analyze the influence of soil water content on bi-directional reflection and to retrieve soil water content, the parameters of bi-directional reflection model were obtained based on the multi-angle hyperspectral data measured in the field and the soil water content was calculated by the model calculation. By analyzing the relationship between model parameters and water content retrieved in three bands and different angles, it is found that there is difference in using different models to retrieve soil water content. The inversion accuracy is the most stable at 865 nm. This indicates that the use of bi-directional reflection distribution can be used to reverse the soil moisture content with high accuracy, and the influence of directional reflection on the inversion accuracy should also be considered.