航空高光谱反演耕地土壤重金属分布特征——以苏北灌河地区为例
Airborne hyperspectral inversion of heavy metal distribution in cultivated soil: A case study of the Guanhe area, north Jiangsu Province
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摘要: 为探索航空高光谱遥感开展大比例尺、大面积土壤重金属含量和分布特征快速调查的技术方法和工作流程,以苏北灌河地区为例,利用国产高光谱成像仪和自主集成的航空高光谱遥感测量系统获取影像光谱数据,通过数据预处理、CARS特征波段选择及BP神经网络建模反演等方法,建立了从数据获取到数据分析评价的工作流程,反演了土壤重金属元素含量,展示了其空间分布特征。与传统地球化学调查数据进行对比分析,结果显示高光谱反演成果与地球化学调查的重金属浓度空间分布特征吻合度较高,验证了航空高光谱反演耕地土壤重金属分布特征的可靠性。在区域性耕地土壤重金属污染调查评价方面,航空高光谱遥感能够快速、及时地获取土壤污染及相关信息,并具有很好的实用性和经济性。Abstract: In order to research the technical method and workflow of rapid investigation of soil heavy metal content and distribution characteristics in large-scale and large-area by airborne hyperspectral remote sensing, taking Guanhe area in northern Jiangsu Province as an example, the domestic hyperspectral sensor and the independent integrated airborne hyperspectral remote sensing system were used to obtain the image spectral data. By means of data preprocessing, CARS characteristic band selection and BP neural network modeling inversion, a workflow from data acquisition to data analysis and evaluation was established, the content of heavy metals in soil was estimated and its spatial distribution characteristics were displayed. Compared with the traditional geochemical survey data, the results show that the hyperspectral inversion results are in good agreement with the geochemical results, which verifies the reliability of the airborne hyperspectral inversion technology. In the aspect of heavy metal pollution investigation and evaluation of regional farmland soil, airborne hyperspectral remote sensing can quickly and timely obtain soil pollution and related information with good practicability and economical efficiency.