基于Sentinel-1 双极化的鄱阳湖地形提取方法

数字高程模型可以提供丰富的地形信息，是研究生态环境、地质地貌、地表形变监测等问题的重要基础资料。本文以SRTM DEM 作为参考DEM，利用四景Sentinel-1 双极化雷达影像对鄱阳湖的数字高程模型进行了反演，更新重建了该区域的地形结果，从可视化和精度两个方面，根据山体阴影图、等高线图、相干系数图和数学拟合模型等对比分析了VV极化和VH 极化这两种极化方式反演DEM 结果。结果表明：利用雷达影像提取鄱阳湖地形是行之有效的，数字高程模型的分辨率为13.90m，与参考DEM 相比，提高了53.67%；根据线性数学模型和二次数学模型对VV 极化方式和VH 极化方式反演结果进行拟合分析，决定系数分别为0.93 和0.94，说明这两种极化方式反演出的DEM 结果相似性很高，均可以准确反演出研究区域的地形结果，反演出的湖底地形可为水利部门展开河湖管理提供数据支撑。

英文摘要:

Digital elevation model can provide abundant topographic information, which is an important basic data for studying ecological environment, geology and geomorphology, surface deformation monitoring and so on.In this paper,SRTM DEM is used as reference DEM, and the digital elevation model of Poyang lake is retrieved by using the dualpolarization radar image of four -view Sentinel -1, and the topographic results of this region are updated and reconstructed.From the aspects of visualization and accuracy, the DEM inversion results of VV polarization and VH polarization are compared and analyzed based on mountain shadow map, contour map, coherence coefficient map and mathematical fitting model.The results show that it is effective to extract the topography of Poyang lake by radar image,and the elevation information of the lake bottom area can be extracted well.The resolution of the digital elevation model is 13.90 m, which is 53.67% higher than that of the reference DEM.Based on the linear mathematical model and the quadratic mathematical model, the fitting analysis of the inversion results of VV polarization mode and VH polarization mode is carried out.The coefficients of determination are 0.93 and 0.94 respectively, indicating that the DEM results of inverse performance of the two polarization modes are highly similar, and could both exactly reverse the topographic results of the study area.The reversed results of lake bottom’s topography can provide data support for water conservancy departments to carry out river and lake management.

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