1[1]SHEN Yun-zhong,LIU Da-jie.GPS Normal Height Calculation Model of Railway Aerial Picture Control Points[J].Journal of Tongji University,1996,24(4):450-455.(in Chinese)
2[2]GUAN Zhe-lin,GUAN Zheng,QU Guo-jun.Sea Surface Topography and the Datum of Height Difference.Beijing:Publishing House of Surveying and Mapping.1996.(in Chinese)
