jgg     2015 35 (4):  689-692    ISSN: 0412-1961  CN: 21-1139/TG Comparisons of Total Least Squares and Least Squares for Fitting Spatial Lines 1 College of Surveying and Geo-informatics, Tongji University, 1239 Siping Road, Shanghai 200092,China 2 Key Laboratory of Modern Engineering Surveying, NASMG, 1239 Siping Road, Shanghai 200092,China 3 College of Marine Sciences, Shanghai Ocean University, 999 Huchenghuan Road, Shanghai, 200120,China Received: 2014-06-12  Revised: null  Online: 2015-07-29 Supporting info