Fig. 1. Airborne laser scanning point cloud with missing due to blocking and its reconstructed DSM. (a) Original laser point cloud; (b) reconstructed TIN model; (c) reconstructed DSM

Fig. 2. Extraction of edge points and vertexes for top surface of building. (a) Rectangular top surface; (b) round top surface

Fig. 3. Laser scanning point cloud of simulative terrain and reconstructed DSM with point cloud before and after supplementation. (a) Original laser point cloud of simulative terrain; (b) reconstructed TIN model with original point cloud; (c) reconstructed DSM with original point cloud

Fig. 4. Elevations of points using different interpolation methods and reconstructed DSMs with point clouds before and after supplementation. (a) Interpolation elevations using cubic method; (b) interpolation elevations using linear method; (c) interpolation elevations using nearest method; (d) reconstructed DSM from original point cloud using cubic method; (e) reconstructed DSM from original point cloud using linear method; (f) reconstructed DSM from original point cloud using nearest method; (g) recon

Table 1. Precision of DSM at different interpolation methods

Table 2. Proportional reduction of error of e_m, d_s and e_rms at different interpolation methods