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嫦娥二号卫星搭载了一台两线阵CCD立体相机,以线阵推扫成像方式获取了覆盖全月球的7m分辨率影像。与嫦娥一号影像相比,影像分辨率大大提高,月表地貌细节更加丰富,制作高分辨率月表DEM更加复杂而困难,现有的基于嫦娥影像制作方法难以满足应用需求。针对嫦娥二号影像特点,在基于RPC模型生成近似核线影像基础上,进行金字塔影像匹配,实现了原始影像的逐像素匹配;计算匹配点的月面坐标后,采用基于反距离插值方法生成月表三维地形;对于图像阴影等地形漏洞,采用基于径向基函数进行插值填补。试验结果表明,该方法生成的月表三维地形DEM数据,能准确真实地表达高分辨率的月表地形地貌细节,并较好地应用于嫦娥二号全月球三维地形DEM数据产品的生产任务中。
Chang’e II satellite equipped with a two-line array CCD stereo camera, linear array scan imaging obtained coverage of the entire moon 7m resolution images. Compared with Chang’e-1 images, the image resolution is greatly increased, the lunar surface topography details are more abundant, making the high-resolution lunar surface DEM is more complicated and difficult. The existing Chang’e-based image production methods can not meet the application requirements. According to the image characteristics of Chang’e II, based on the RPC model to generate the approximate nuclear line image based on the pyramid image matching, the original image pixel by pixel matching; calculation of the matching point lunar coordinates, based on inverse distance interpolation method to generate the month Table three-dimensional terrain; for image shading and other topographic loopholes, using interpolation based on radial basis function interpolation. The experimental results show that the DEM data of lunar surface 3D terrain generated by this method can accurately and truly express the high resolution lunar surface topography and geomorphology details and is well applied to the production tasks of Chang’e II lunar 3D terrain DEM data product .