jgg     2015 35 (3):  490-494    ISSN: 0412-1961  CN: 21-1139/TG Establishment of Bathymetry Model in South China Sea Based on the  Satellite Altimetry-Derived Gravity Anomaly 1 School of Geography Spatial Information，Information Engineering University，62 Kexue Road, Zhengzhou 450001，China 2 Xi’an Research Institute of Surveying and Mapping，1 Mid-Yanta Road, Xi’an 710054，China 3 Stake Key Laboratory of Geo-information Engineering，1 Mid-Yanta Road, Xi’an 710054，China 4 Technical Division of Surveying and Mapping，36 Xiying Road, Xi’an 710054，China Received: 2014-05-12  Revised: null  Online: 2015-06-02 Supporting info