6Sithole G, Vosselman G. Experimental Comparison of Filter Algorithms for Bare-Earth Extraction from Airborne Laser Scanning Point Clouds[J]. ISPRS Journal of Photogrammetry & Remote Sensing, 2004, 59:85-101.
7Axelsson P. Processing of Laser Scanner Data- Algorithms and Applications[J]. ISPRS Journal of Photogrammetry& Remote Sensing, 1999,54 (2/3) : 138-147.
8Lindenberger J. Laser-Profitmessungen Zur Topographischen Gelandeaufnahme [D]. Stuttgart: University Stuttgart, 1993.
9Sui Lichun. Analysis of Laser Scanner Data by Means of Digital Image Processing Techniques[M]. Munich, Germany : Publishing House, 2003.
10Petzold B, Axelsson P. Result of the OEEPE WG on Laser Data Acquisition[J]. International Archives of Photogrammetry and Remote Sensing, Amsterdam, 2000,33(B3) : 718-723.