[1] [1] WU H, LIU H Y, DING G F, et al. Automatic extraction of power lines from laser point clouds in complex environments ［J］. Laser Technology, 2020, 44(4): 509-514(in Chinese).

[2] [2] XU L G, GUO T, WU Sh H. et al. Fast extraction and reconstruction of power line based on point cloud data features［J］. Laser Technology, 2020, 44(2): 244-249(in Chinese).

[3] [3] WANG Sh Y, TAO Sh X, YANG F, et al. Laser range gated imaging target recognition based on convolutional neural network［J］. Laser & Optoelectronics Progress, 2019, 56(2): 21001 (in Chinese).

[4] [4] FENG M, YANG M L, XIA Y H, et al. 3-D modeling of high-steep cliffs combining with 3-D laser scanning and oblique photogrammetry［J］. Science of Surveying and Mapping, 2020, 45(1): 99-107 (in Chinese).

[5] [5] WU K, AO J F, FANG Q. Extraction of building’s feature lines based on 3-D laser scanning technology［J］. Laser Technology, 2012, 36(4): 553-556(in Chinese).

[6] [6] LIU Y, SUN Sh Y. Laser point cloud denoising based on principal component analysis and surface fitting［J］. Laser Technology, 2020, 44(4):497-502(in Chinese).

[7] [7] KE Y L, FAN Sh Q. Research on direct extraction of boundary from point clouds［J］. Chinese Journal of Mechanical Engineering, 2004, 40(9): 116-120(in Chinese).

[8] [8] SUN D Zh, FAN Zh X, LI Y R. Automatic extraction of boundary characteristic from scattered data［J］. Huazhong University of Science & Technology(Natural Science Edition), 2008, 36(8):82-84(in Chinese).

[9] [9] CHEN Y R, WANG Y B, PENG Zh J, et al. Improved algorithm for extraction of boundary characteristic point from scattered point cloud［J］. Computer Engineering and Applications, 2012, 48(23): 77-180 (in Chinese).

[10] [10] SU Y L, PING X L. Point cloud edge extraction algorithm based on Gauss map clustering［J］. Laser & Optoelectronics Progress, 2019, 56(11): 111506(in Chinese).

[11] [11] CHEN X, TONG X H. Research on points cloud hole filling algorithm and accuracy in triangle mesh［J］. Bulletin of Surveying and Mapping, 2013, 59(4): 1-3(in Chinese).

[12] [12] LIN S, TIAN L Y, BI J X, et al. Accurate calculation of single-tree crown volume based on 3-D laser scanning data［J］. Science of Surveying and Mapping, 2020, 45(8): 115-122(in Chinese).

[13] [13] WANG Z Y, MA H Ch, XU H G, et al. Novel algorithm for fast extracting edges from massive point clouds［J］. Computer Engineering and Applications, 2010, 46(36): 213-215(in Chinese).

[14] [14] HE H, LI Z C, LI G J, et al. Surface reconstruction for scattered point clouds with adaptive α-shape［J］. Journal of Computer Applications, 2016, 36(12): 3394-3397 (in Chinese).

[15] [15] LI W J, LI Sh N, QIU J, et al. Boundary detection of multi-density point cluster using convex hull retracted method［J］. Science of Surveying and Mapping 2014, 39(9): 126-129(in Chinese).

[16] [16] JIANG Ch Ch, LIU K, SHU M. Algorithm for fast and accurate boundary points extraction［J］. Journal of Optoelectronics · Laser, 2020, 31(5): 531-538(in Chinese).

[17] [17] HAN Y Ch, HOU H, BAI Y R, et al. A closed point cloud edge extraction algorithm using edge coefficient［J］. Laser & Optoelectronics Progress, 2018, 55(11): 111003 (in Chinese).

[18] [18] BENTLEY J L. Multidimensional binary search trees used for associative searching ［J］. Journal of Communications of the ACM, 1975, 18(9): 509-517.

[19] [19] WANG H T, ZHANG L Y, DU J, et al. Simplification and error analysis based on implicit surface for measuring point-sets［J］. Journal of Image & Graphics, 2007, 12(11): 2114-2118.

[20] [20] MARTIN R R, STROUD I A, MARSHALL A D. Data reduction for reverse engineering［J］. Reccad, Deliverable Document Copernicus Project, 1997, 10(1): 85-100.