jgg     2012 32 (5):  99-102    ISSN: 0412-1961  CN: 21-1139/TG OPTIMAL METHOD FOR GM(1,1) MODELING FOR PREDICTION OF DEFORMATION TAKING COMPENSATION FOR MODEL ERRORS INTO ACOUNT Gao Ning 1,2) ;Cui Ximin 1) ; and Gao Caiyun 2) 1)College of Geoscience and Surveying Engineering, China University of Mining and Technology, Beijing 100083;2)Faculty of Survey & Spatial Information Engineering, Henan University of Urban Construction, Pingdingshan 467036 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null