5[2]Axelsson P.Processing of laser scanner data-algorithms and applications[J].ISPRS Journal of Photogrammetry and Remote Sensing,1999,54(2/3):138-147.
6[3]Kraus K, Pfeifer N.Determination of terrain models in wooded areas with airborne laser scanner data[J].ISPRS Journal of photogrammetry and remote sensing, 1998, 53(4):193-203.
7[4]Fritsch D, Kilian J.Filtering and calibration of laser scanner measurements[J].Arch.Of Phtotogrammetry and Remote Sensing, 1994,30(3):227-234.
8[5]Huising E J,Gomes Pereira L M. Errors and accuracy estimates of laser data acquired by various laser scanning systems for topographic applications [J].ISPRS Journal of photogrammetry and remote sensing, 1998,53(4):245-261.
9[6]Hug Ch, Wehr A. Detecting and identifying topographic objects in imaging laser altimetry data [J].International Archives of Photogrammetry and Remote Sensing, 1997, 32(3-4W2):19-26.
10[7]Vosselman G.Slope based filtering of laser altimetry data [J].International Archives of Photogrammetry and Remote Sensing,Amsterdam. 2000,33(B3):935-942.
