jgg     2015 35 (5):  811-815    ISSN: 0412-1961  CN: 21-1139/TG 〗Filtering of Airborne LiDAR Point Cloud Data Based on Mathematical  Morphology and Region Growing 1 Faculty of Geosciences and Environment Engineering, Southwest Jiaotong University, West High-Tec Zone, Chengdu 611756, China〖JP〗 2 State-Province Joint Engineering Laboratory of Spatial Information Technology of High-Speed Rail Safety,  West High-Tec Zone, Chengdu 611756, China 3 The Third Surveying and Mapping Engineering Institute of Sichuan, 2 Xinjun Street, Chengdu 610500, China Received: 2014-08-12  Revised: null  Online: 2015-10-10 Supporting info