基于资源一号02D高光谱卫星影像的青海湖悬浮物浓度反演研究

Retrieval Sudy of Total Suspended Matter Concentration in Qinghai Lake based on ZY102D Hyperspectral Satellite Images

水体悬浮物浓度是描述水体光学特性的一个重要参数。卫星遥感具有大范围、快速、高频次动态监测的优势,有助于加强对青海湖水环境质量的监测,降低监测成本。而资源一号02D(ZY1-02D)卫星高光谱影像作为新的数据源,具有高空间分辨率、高光谱分辨率的优点,为湖泊的水质高精度监测提供了可能性。为了验证ZY1-02D高光谱相机在水质遥感监测应用中的适用性,以ZY1-02D高光谱影像为遥感数据源,同时辅助实测数据,构建青海湖悬浮物浓度反演模型,并进行精度验证,评价模型的准确性,最后将模型应用于青海湖悬浮物浓度反演。研究结果表明:青海湖悬浮浓度反演模型平均相对误差为21.1%,均方根误差为0.296 mg/L,精度较好,青海湖悬浮物浓度反演结果呈现湖心低岸边高的特征,与同期Sentinl-2和同期Landsat 8数据反演结果进行对比,反演结果保持一致,说明ZY1-02D高光谱影像能够作为悬浮物浓度遥感反演的数据源之一。

The concentration of suspended matter in water body is an important parameter to describe the optical characteristics of water body.Satellite remote sensing has the advantages of a large range,fast and high-frequency word dynamic monitoring,which helps to strengthen the monitoring of water environment quality of Qinghai Lake and reduce the monitoring cost.And ZY1-02D satellite hyperspectral camera with high spatial resolution and high spectral resolution provides the possibility of high-precision monitoring of water quality in Qinghai Lake.In order to verify the applicability of the ZY1-02D hyperspectral camera in the application of remote sensing monitoring of water quality,this paper uses the ZY1-02D hyperspectral camera as the remote sensing data source,and also assists the actual measurement data to construct an inversion model of the suspended matter concentration in Qinghai Lake,and conducts accuracy verification to evaluate the accuracy of the inversion results.The results show that the average relative error of the Qinghai Lake suspended concentration inversion model is 21.1%,and the root mean square error is 0.296 mg/L.The accuracy is good,and the inversion results of Qinghai Lake suspended concentration show the characteristics of low in the center of the lake and high on the shore,compared with the retrieval results of Sentinel-2 and Landsat-8 in the same period,the retrieval results of Sentinel-2 and Landsat-8 in the same period,the inversion results remain consistent,results remain consistent,which indicates that the ZY1-02D hyperspectral image can retrieve the water quality parameters.