jgg     2011 31 (1):  63-67    ISSN: 0412-1961  CN: 21-1139/TG RESEARCH ON COORDINATE TRANSFORMATION BETWEEN GCRS AND ITRS Zhang Hanwei 1) ;Zheng Yong 2) ; and Ma Gaofeng 2) 1)School of Surveying and Land Information Engineering, Henan Polytechnic University, Jiaozuo 4540032)Institute of Surveying and Mapping, Information Engineering University of PLA, Zhengzhou 450052 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null