[1] Hui Z Y. Research on some key techniques of extracting city road networks from airborne LiDAR point cloud[D]. Wuhan: China University of Geosciences, 4-8(2017).
[2] Lindenberger J. Laser-profilmessungen zur topographischen geländeaufnahme[D]. Stuttgart: Stuttgart University, 131-134(1993).
[3] Sui L C, Zhang Y B, Liu Y et al. Filtering of airborn LiDAR point cloud data based on the adaptive mathematical morphology[J]. Acta Geodaetica et Cartographica Sinica, 39, 390-396(2010).
[7] Li Y, Wu H Y, Xu H W et al. A gradient-constrained morphological filtering algorithm for airborne LiDAR[J]. Optics & Laser Technology, 54, 288-296(2013).
[8] 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).
[9] Zhou X M. Research and application of airborne LiDAR point cloud filters[D]. Zhengzhou: PLA Information Engineering University, 43-51(2014).
[10] 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).
[11] Zhao J H. The research in the drawing of contour lines and filling which is based on the rectangular grid method in irregular areas[D]. Beijing: China University of Geosciences, 9-48(2013).
[12] Xu X. Research of contour line generation and color fill based on triangulation[D]. Changsha:Central South University, 16-45(2011).
[13] Sithole G, Vosselman G. Automatic structure detection in a point-cloud of an urban landscape. [C]∥2003 2nd GRSS/ISPRS Joint Workshop on Remote Sensing and Data Fusion over Urban Areas, May 22-23, 2003, Berlin, Germany. New York: IEEE, 67-71(2003).
[14] Sui L C, Zhang Y B, Zhang S et al. Filtering of airborne LiDAR point cloud data based on progressive TIN[J]. Geomatics and Information Science of Wuhan University, 36, 1159-1163(2011).