jgg     2015 35 (3):  420-423    ISSN: 0412-1961  CN: 21-1139/TG The Research about the Point-Cloud-Plane Fitting Based on  Penalized Least Squares 1 School of Earth Science and Engineering, Hohai University, 1 Xikang Road, Nanjing 210098,China Received: 2014-05-20  Revised: null  Online: 2015-06-02 Supporting info