[1] Liu Zhiqing, Li Pengcheng, Chen Xiaowei, et al. Classification of airborne LiDAR point cloud data based on information vector machine[J]. Optics and Precision Engineering, 24, 210-219(2016).

[2] Wang Yanan, Wang Tingfeng, Tian Yuzhen, et al. Improved local convexity algorithm of segmentation for 3D point cloud[J]. Chinese Optics, 10, 348-354(2017).

[3] Liu Zhiqing, Li Pengcheng, Guo Haitao, et al. Airborne LiDAR point cloud data classification based on relevance vector machine[J]. Infrared and Laser Engineering, 45, S130006(2016).

[4] Feng Fajie, Ding Yazhou, Li Junping, et al. Airborne LiDAR point cloud filtering using saliency division[J]. Infrared and Laser Engineering, 49, 20190439(2020).

[5] Sun Meiling, Li Yongshu, Chen Qiang, et al. Iterative multi-scale filter based on morphological opening by reconstruction for LiDAR urban data[J]. Infrared and Laser Engineering, 44, 363-369(2015).

[6] Chen C, Li Y, Li W, et al. A multiresolution hierarchical classification algorithm for filtering airborne LiDAR data[J]. ISPRS Journal of Photogrammetry and Remote Sensing, 82, 1-9(2013).

[7] Zhao Chuan, Zhang Baoming, Yu Donghang, et al. Airborne LiDAR point cloud classification using transfer learning[J]. Optics and Precision Engineering, 27, 1601-1612(2019).

[8] Zhang J, Lin X. Filtering airborne LiDAR data by embedding smoothness-constrained segmentation in progressive TIN densification[J]. ISPRS Journal of Photogrammetry and Remote Sensing, 81, 44-59(2013).

[9] Zhao X, Guo Q, Su Y, et al. Improved progressive TIN densification filtering algorithm for airborne LiDAR data in forested areas[J]. ISPRS Journal of Photogrammetry and Remote Sensing, 117, 79-91(2016).

[10] Chen C, Li Y, Yan C, et al. An improved multi-resolution hierarchical classification method based on robust segmentation for filtering ALS point clouds[J]. International Journal of Remote Sensing, 37, 950-968(2016).

[11] Yang B, Huang R, Dong Z, et al. Two-step adaptive extraction method for ground points and breaklines from lidar point clouds[J]. ISPRS Journal of Photogrammetry and Remote Sensing, 119, 373-389(2016).

[12] Bigdeli B, Amini Amirkolaee H, Pahlavani P. DTM extraction under forest canopy using LiDAR data and a modified invasive weed optimization algorithm[J]. Remote Sensing of Environment, 216, 289-300(2018).

[13] Meng X, Lin Y, Yan L, et al. Airborne LiDAR point cloud filtering by a multilevel adaptive filter based on morphological reconstruction and thin plate spline interpolation[J]. Electronics, 8, 1153(2019).

[14] Chen C, Wang M, Chang B, et al. Multi-level interpolation-based filter for airborne LiDAR point clouds in forested areas[J]. IEEE Access, 8, 41000-41012(2020).

[15] Zhang W, Qi J, Wan P, et al. An easy-to-use airborne LiDAR data filtering method based on cloth simulation[J]. Remote Sensing, 8, 501(2016).

[16] Axelsson P. DEM generation from laser scanner data using adaptive TIN models[J]. International Archives of Photogrammetry and Remote Sensing, 33, 110-117(2000).

[17] Pingel T J, Clarke K C, Mcbride W A. An improved simple morphological filter for the terrain classification of airborne LIDAR data[J]. ISPRS Journal of Photogrammetry and Remote Sensing, 77, 21-30(2013).