摘要
1.Main technical progressinestablishing spatiotemporal datum in China.1.1 Spatial datum.Spatial datum includes three-dimensional coordinate datum(including deep-space datum),height datum(vertical datum),depth datum,and gravity datum.Three generations of geodetic coordinate systems have been built since the establishment of the People's Republic of China,namely,the Beijing coordinate system 1954(BS-54),the Xi'an coordinate system 1980(XS-80),as well as the China Geodetic Coordinate System 2000(CGCS2000)and its reference frame(CTRF2000)(Chen et al.,2007;Yang et al.,2007;Yang,2009).
基金
supported by the National Natural Science Foundation of China(Grant No.41931076)
the Scientific and Technology Innovation Program of Laoshan Laboratory(Grant No.LSKJ202205101).
