[1] Zhang K Q, Chen S C, Whitman D et al. A progressive morphological filter for removing nonground measurements from airborne LIDAR data[J]. IEEE Transactions on Geoscience and Remote Sensing, 41, 872-882(2003).
[3] He P P, Wan Y C, Huang G P et al. Adaptive slope filtering algorithm for LiDAR point clouds in urban areas[J]. Remote Sensing Information, 32, 62-68(2017).
[4] Xu Y, Yue D J. Integrative clustering filtering of airborne LiDAR data for digital terrain model generation[J]. Journal of Geodesy and Geodynamics, 37, 93-96(2017).
[5] Sithole G, Vosselman G. ISPRS test on extracting DEMs from point clouds: a comparison of existing automatic filters[R]. Delft: ISPRS(2003).
[6] Zhang X H. Airborne laser scanning altimetry data filtering and features extraction[D]. Wuhan: Wuhan University, 28-67(2002).
[7] Diao X P, Wu K. Improved moving window surface fitting method of point cloud data[J]. Modern Mining, 27, 59-61(2011).
[9] Li Y, Yong B, Wu H Y et al. An improved top-hat filter with sloped brim for extracting ground points from airborne lidar point clouds[J]. Remote Sensing, 6, 12885-12908(2014).
[10] Cai F N. Digital filter threshold algorithm based on clustering analysis[J]. Journal of Data Acquisition & Processing, 21, 234-238(2006).
[11] Su W, Sun Z P, Zhong R F et al. A new hierarchical moving curve-fitting algorithm for filtering lidar data for automatic DTM generation[J]. International Journal of Remote Sensing, 36, 3616-3635(2015).
[12] Axelsson P. DEM generation from laser scanner data using adaptive TIN models[J]. International Archives of Photogrammetry and Remote Sensing, 33, 110-117(2000).
[13] Sithole G, Vosselman G. Experimental comparison of filter algorithms for bare-Earth extraction from airborne laser scanning point clouds[J]. ISPRS Journal of Photogrammetry and Remote Sensing, 59, 85-101(2004).
[14] Zhu X X, Wang C, Xi X H et al. Hierarchical threshold adaptive for point cloud filter algorithm of moving surface fitting[J]. Acta Geodaetica et Cartographica Sinica, 47, 153-160(2018).