jgg     2012 32 (2):  100-104    ISSN: 0412-1961  CN: 21-1139/TG STUDY ON ACCURACY OF ZTD AND ZWD CALCULATED FROM ERA-INTERIM DATA OVER CHINA Ma Zhiquan 1) ; Chen Qinming 2,3) ;and Gao Dezheng 1) 1)Southwest University of Science and Technology, School of Environment and Resource, Mianyang 621010;2)Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030; 3)Graduate School of the Chinese Academy of Sciences, Beijing 100039 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null