jgg     2008 28 (5):  125-128    ISSN: 0412-1961  CN: 21-1139/TG TRANSFORMATION FROM 1980 XI’AN COORDINATESYSTEM TO 2000 CHINESE COORDINATE SYSTEM BASED ON COLLOCATION Zeng Anmin 1,2) 1) School of Geology Engineering and Geomatics，Chang’an University，Xi’an 7100542) Xi’an Information Division of Surveying and Mapping, Xi’ an 710054 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null