jgg     2010 30 (4):  122-127    ISSN: 0412-1961  CN: 21-1139/TG DATA PROCCESSING AND ACCURACY ANALYSIS IN SHIELD POSTURE MEASUREMENT Chen Suzhen 1) ;Sun Hao 1) ; and Yao Lianbi 1,2) 1)Department of Surveying and GeoInformatics，Tongji University，Shanghai 2000922)Key Laboratory of Advanced Engineering Surveying of SBSM，Shanghai 200092 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null