Surface Reconstruction and Multi Resolution Express from Terrestrial Laser Scanning Data Based on Stratified Contours

Abstract:

A stratified contours based surface reconstruction and multi resolution express method is proposed in this paper. First, an iterated convex hull algorithm is hired to extract the stratified contours from vertical distributed point cloud. Then, based on the stratified contours, in synchronous headway premise, the shortest circumcircle radius method is adopted to finish the triangularization processing from adjacent contours to obtain the local object’s model. After connecting the triangles in adjacent levels and unifying the normal vector for each triangle, the reconstructed surface model could be used to express the object. To convey the surface model in multi resolution, the elevation interval and horizontal resample distance is chosen as the model parameters for low resolution model generation. Furthmore, the optical parameter selection method is introduced to achieve better modeling results. At last, two case studies are chosen to verify the validity of the proposed method.

Key words:terrestrial laser scanning(TLS); surface reconstruction; point cloud; contour; multi resolution