Reconstruction of Terrain based on corrected Digital Elevation Models

Abstract

Abstract The paper describes the method of reducing the errors, primarily caused by vegetation, in open digital models like Aster and SRTM. These models do not usually meet the requirements of hydrological correctness due to the errors of different origin. The main errors of DEM are the distortion of the tilt angles and the absolute altitude component in the areas occupied by forest vegetation. We propose the method for eliminating vegetation cover by a local interpolation function and Lagrange polynomial interpolation. The paper also considers the comparison of the proposed method with other methods such as Triangulation Irregular Network (TIN), Inverse Distance Weighting (IDW), Natural Neighbor, Kriging, Radial Basis Functions.