A method of deriving DEM from airborne LiDAR points cloud data

LiDAR data is the new source of obtaining DEM. In this paper, an acquiring DEM method using this data source is promoted, which firstly screens the last and single return waves, then builds TIN to acquire the nearby points' information of each point which helps filtering, lastly removes the isolated points and generates DEM. The experimental results show that this method is available and effective.