jgg     2010 30 (2):  129-132    ISSN: 0412-1961  CN: 21-1139/TG AN NONLINEAR LEAST SQUARES ALGORITHM FOR SPATIAL COORDINATE TRANSFORMATION Chen Yu and Bai Zhengdong Department of Civil Engineering, Tsinghua University, Beijing 100084 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null