[1] [1] YUN T, JIANG K, LI G C, et al. Individual tree crown segmentation from airborne LiDAR data using a novel Gaussian filter and energy function minimization-based approach［J］. Remote Sensing of Environment, 2021, 256: 112307.

[2] [2] TAO S L, WU F F, GUO Q H, et al. Segmenting tree crowns from terrestrial and mobile LiDAR data by exploring ecological theories［J］. ISPRS Journal of Photogrammetry and Remote Sensing, 2015, 110: 66-76.

[3] [3] LIU J P, SHEN J, ZHAO R, et al. Extraction of individual tree crowns from airborne LiDAR data in human settlements［J］. Mathematical and Computer Modelling, 2013, 58(3/4): 524-535.

[4] [4] YAN M, XIA Y H, YANG X Y, et al. Biomass estimation of subtropical arboreal forest at single tree scale based on feature fusion of airborne LiDAR data and aerial images［J］. Sustainability, 2023, 15(2): 1676.

[5] [5] MU Y, ZHOU G, WANG H. Canopy LiDAR point cloud data K-means clustering watershed segmentation method［J］. ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences, 2020, 6: 67-73.

[9] [9] CHEN Q, BALDOCCHI D, GONG P, et al. Isolating individual trees in a savanna woodland using small footprint lidar data［J］. Photogrammetric Engineering & Remote Sensing, 2006, 72(8): 923-932.

[10] [10] KHOSRAVIPOUR A, SKIDMORE A K, ISENBURG M, et al. Generating pit-free canopy height models from airborne lidar［J］. Photogrammetric Engineering & Remote Sensing, 2014, 80(9): 863-872.

[12] [12] MORSDORF F, MEIER E, KTZ B, et al. LiDAR-based geometric reconstruction of boreal type forest stands at single tree level for forest and wildland fire management［J］. Remote Sensing of Environment, 2004, 92(3): 353-362.

[14] [14] VEGA C, HAMROUNI A, EL MOKHTARI S, et al. PTrees: A point-based approach to forest tree extraction from lidar data［J］. International Journal of Applied Earth Observation and Geoinformation, 2014, 33: 98-108.

[16] [16] HUI Z, LI N, XIA Y, et al. Individual tree extraction from uav LiDAR point clouds based on self-adaptive mean shift segmentation［J］. ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences, 2021, 51: 25-30.

[19] [19] ZHANG W M, QI J B, WAN P, et al. An easy-to-use airborne LiDAR data filtering method based on cloth simulation［J］. Remote Sensing, 2016, 8(6): 501.

[22] [22] REYNOLDS D. Gaussian mixture models［M］.Encyclopedia of Biometrics. Boston, MA: Springer US, 2009: 659-663.

[24] [24] MOON T K. The expectation-maximization algorithm［J］. IEEE Signal Processing Magazine, 1996, 13(6): 47-60.

[25] [25] CAO Y, WANG Y C, XUE Y F, et al. FEC: Fast euclidean clustering for point cloud segmentation［J］. Drones, 2022, 6(11): 325.

[26] [26] AYREY E, FRAVER S, KERSHAW J A, et al. Layer stacking: A novel algorithm for individual forest tree segmentation from LiDAR point clouds［J］. Canadian Journal of Remote Sensing, 2017, 43(1): 16-27.