关键词: DSM, DEM, 形态学滤波, 网格采样

Abstract: In order to find a new production method for DEM and improve the updating efficiency of city DEM, this paper proposes a new method to filter non-ground elevation points from ground elevation points in DSM by progressive morphological filter. The ground elevation points are then triangulated to Delaunay triangulation and the DEM is generated by intersecting rays with the Delaunay triangulation. The experiment shows that the proposed method not only generates DEM effectively, but also generates DEM with great precision, proving that it has important practical value. In conclusion, the proposed algorithm is technically feasible and it can improve the utilization rate of drone DSM to promote the renewal of city DSM.

Key words: DSM, DEM, progressive morphological filter, grid sampling