jgg     2011 31 (6):  132-135    ISSN: 0412-1961  CN: 21-1139/TG APPLICATION OF 2D VONDRAK FILTERING IN HEIGHT ANOMALY FITTING Wu Yunyun 1,2) ;Zhu Jianjun 1,2) ; and Zuo Tingying 1,2) 1)Department of Survey Engineering and Geomatics,Central South University,Changsha 410083;2)Key Laboratory of Precise Engineering Surveying and Deformation Hazard Monitoring, Universities of Hunan Province, Changsha 410083 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null