jgg     2012 32 (6):  86-89    ISSN: 0412-1961  CN: 21-1139/TG FITTING METHOD FOR SPACE PLANE CIRCLE PARAMETERS WITH CONSTRAINT CONDITIONS Ma Xiaping College of Surveying and Geo-Informatics, Tongji University, Shanghai 200092 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null