jgg     2007 27 (1):  1-6    ISSN: 0412-1961  CN: 21-1139/TG PROGRESS IN THEORY AND PRACTICE FOR GEODETIC REFERENCE COORDINATE FRAME Chen Junyong National Bureau of Surveying & Mapping, Beijing 100830 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null