A Method for Generating Mathematical Morphological Transformation of DTM Triangle Grid
Triangular grid is an important tool for describing the terrain state of digital terrain models.In order to generate high-precision triangular grids,a method for generating DTM triangular grids based on mathematical morpho-logical transformation was put forward.Firstly,automatic scan line was used to fill and locate grid points,and the starting and ending row numbers of the scan rows were calculated.After that,the intersection points between scan rows and triangle boundaries were mined.Meanwhile,the positioning information of the triangle with regular grid points.Moreover,the density of regional discrete points,the average distance of neighboring discrete points,and the maximum length of the boundary triangle were used as constraints to divide the structural elements in mathematical morphological transformation.At the same time,corrosion and expansion operations were employed to process image signal data,thereby obtaining the similarity level of the signal waveform and structural elements.Furthermore,the outer contour lines of the DTM model image were extracted.Finally,insertion points were randomly set,and all dis-crete point data were segmented to form some grids with moderate size,thereby connecting the insertion points and tri-angle vertices.Simulation results prove that the proposed method can accurately obtain grid features in detail and out-put high-quality triangular grid models.
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