其他摘要：Digital Elevation Model (DEM) construction from satellite imagery allows high resolution topographic mapping. Nevertheless, errors can significantly affect topographic data acquired at an altitude of 800 kIn. Here, a correction method based on ground control points (OCP) is proposed. The method comprises: 1)the application of a rigid shift which minimizes misfit to the data in a least squares sense, and 2)the application of an elastic deformation so that every OCP is moved to a position of zero error. Between the measured points, the displacement is calculated using interpolation techniques. The proposed method is applied to real data from a stereoscopic DEM corrected using 28 ground control points.
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