Airborne LiDAR Data Filtering by Morphological Reconstruction Method

A method is proposed for filtering.KD-tree is employed to eliminate the blunders,only last returns and singular echoes are retained for filtering after making multi-returns analysis,and morphological reconstruction is used to achieve the DEM from the DSM.Compared to the existing methods,it only needs one human input,and the input has a very simple indication.The experimental results show that our method can retain the ground points and eliminate the non-ground point as much as possible.That is the type I error,type II error,total error are kept within 9.93%,7.27% and 9.76%.