jgg     2012 32 (5):  128-132    ISSN: 0412-1961  CN: 21-1139/TG SLOPE IMPROVED MORPHOLOGICAL FILTERING ALGORITHM FOR LIDAR POINT CLOUDS Li Feng1,2) ; Cui Ximin1,2); Yuan Debao1,2); Wang Guo1,2);and Zhang Ling1,2) 1)State Key Laboratory of Coal Resources and Safe Mining, CUMTB, Beijing 100083;2)College of Geoscience and Surveying Engineering, CUMTB, Beijing 100083 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null