jgg     2009 29 (3):  91-94    ISSN: 0412-1961  CN: 21-1139/TG APPLICATION OF GREY MODEL BASED ON BUFFER OPERATOR TO CRUSTAL DEFORMATION FORECASTING Xu Junyi 1,2) ; and Zeng Anmin 3) 1)Institute of Surveying and Mapping, Information Engineering University,Zhengzhou 4500522)Xi’an Information Technique Institute of Surveying and Mapping, Xi’an 7100543)Xi’an Research Institute of Surveying and Mapping, Xi’an 710054 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null