jgg     2012 32 (1):  68-71    ISSN: 0412-1961  CN: 21-1139/TG STUDY ON NON-UNIFORM B-SPLINE LEAST SQUARES APPROXIMATION OF REGIONAL GEOMAGNETIC ANOMALY FIELD Wang Xianglei 1) ;Liu Peigen 2) ; and Yang Hong 2) 1)Institute of Surveying and Mapping, Information Engineering University, Zhengzhou 450052;2)61081Troops, Beijing 100094 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null