School of Geodesy and Geomatics Wuhan University Wuhan 430079 China;
School of Geodesy and Geomatics Wuhan University Wuhan 430079 ChinaKey Laboratory of Geospace Environment and Geodesy Ministry of Education Wuhan University Wuhan 430079 China;
School of Geodesy and Geomatics Wuhan University Wuhan 430079 ChinaKey Laboratory of Geospace Environment and Geodesy Ministry of Education Wuhan University Wuhan 430079 China;
School of Resources and Civil Engineering Northeastern University Shenyang 110004 China;
School of Geodesy and Geomatics Wuhan University Wuhan 430079 China;
Gravity field model; GOCE; GRACE; Satellite altimetry; Block-diagonal least-squares;