Fusion of LiDAR data and orthoimage for automatic building reconstruction

Recent years LiDAR data is widely used for constructing 3D terrain models which provide realistic impressions of the urban environment. This paper presents an automatic method for extracting 3D building model by the fusion of LiDAR data, 2D building outlines and orthoimage. 2D building outlines is generated by classifying the LiDAR data to terrain and off-terrain points, then detecting building edges points through step-structure detector and generalization. 2D building boundaries are added on the DSM (Digital Surface Model) from LiDAR data to generate complex buildings by using CSG with the Boolean operations of union, intersection and differences.