jgg     2015 35 (3):  424-427    ISSN: 0412-1961  CN: 21-1139/TG Point Cloud Simplification Algorithm for Terrain Data 1 Foshan Urban Planning Design and Surveying Research Institute, 62 North-Lingnan Road, Foshan 528000,China 2 School of Geodesy and Geomatics, Wuhan University, 129 Luoyu Road, Wuhan 430079,China Received: 2014-06-04  Revised: null  Online: 2015-06-02 Supporting info