[1] Dai S S, Li T F. The development and application prospects of ground three-dimensional laser scan technology[J]. Modern Surveying and Mapping, 32, 11-12, 15(2009).

[2] Zhang L S, Cheng X J. Tunnel deformation analysis based on lidar points[J]. Chinese Journal of Lasers, 45, 0404004(2018).

[3] Zhang T, Chen X J. Bridge amplitude monitoring with three-dimensional laser scanning technology[J]. Laser & Optoelectronics Progress, 55, 051409(2018).

[4] Zhang H W, Lai B L. Characteristics and application prospect of three-dimensional laser scanning technology[J]. Bulletin of Surveying and Mapping, S1, 320-322, 337(2012).

[5] Zhang Y H. Research on feature extraction method of scattered point clouds and technology of fragments splicing of site defect Xi'an:[D]. Northwest University(2017).

[6] Xiao Y, Hu S X, Xiao S et al. A fast statistical method of tree information from 3D laser point clouds[J]. Chinese Journal of Lasers, 45, 0510007(2018).

[7] Qian J F, Chen Z Y, Zhang S Y et al. The detection of boundary point of point cloud compression[J]. Journal of Image and Graphics, 10, 164-169(2005).

[8] Daniels J I, Ha L K, Ochotta T et al. Robust smooth feature extraction from point clouds. [C]∥Proceedings of IEEE International Conference on Shape Modeling and Applications, 123-136(2007).

[9] Chen P, Tan Y W, Li L. Extraction of building's feature lines based on 3D terrestrial laser scanning[J]. Laser Journal, 37, 9-11(2016).

[10] Wang J H, Lindenbergh R, Shen Y Q, Remote Sensing, Spatial Information Scienceset al. Coarse point cloud registration by egi matching of voxel clusters[J]. III-, 5, 97-103(2016).

[11] Demarsin K, Vanderstraeten D, Volodine T et al. Detection of closed sharp edges in point clouds using normal estimation and graph theory[J]. Computer-Aided Design, 39, 276-283(2007). http://dl.acm.org/citation.cfm?id=1238145.1238372

[12] Shi H L, Wu L S, Yu Z Q et al. Algorithm for feature information extraction from scattered point cloud data[J]. Computer Engineering, 43, 279-283(2017).

[13] Wang D Y, Cheng X W, Zheng Y L et al. Mathematic morphology-based building edge detection under Matlab platform[J]. Science of Surveying and Mapping, 35, 172-173, 92(2010).

[14] Zou W H, Chen Z Y, Ye X Z et al. A new method for extracting feature skeleton from point cloud[J]. Journal of Zhejiang University (Engineering Science), 42, 2103-2107(2008).

[15] Calinski T, Harabasz J. A dendrite method for cluster analysis[J]. Communications in Statistics-Simulation and Computation, 3, 1-27(1974). http://www.tandfonline.com/doi/full/10.1080/03610927408827101

[16] Dimitriadou E. Dolni ar S, Weingessel A. An examination of indexes for determining the number of clusters in binary data sets [J]. Psychometrika, 67, 137-159(2002).

[17] Dudoit S, Fridlyand J. A prediction-based resampling method for estimating the number of clusters in a dataset[J]. Genome Biology, 3, 1-21(2002). http://link.springer.com/article/10.1186/gb-2002-3-7-research0036

[18] Zhou S B, Xu Z Y, Tang X Q. New method for determining optimal number of clusters in K-means clustering algorithm[J]. Computer Engineering and Applications, 46, 27-31(2010).