云浮市存量测绘地理信息数据转换至CGCS2000的应用研究

Study on the Application of Converting the Stock Mapping Geographic Information Data of Yunfu City to CGCS2000

集三维、地心、动态、本土、高精度等特点于一体的CGCS2000坐标基准,是我国现代化测绘基准体系建设的重要组成部分,存量数据向CGCS2000坐标基准的统一意义深远。以云浮市为例,为确保坐标转换参数求取的符合性和正确性,加密了C级GNSS大地平面测量控制点并联测已有C级GNSS点,选取了二维七参数转换模型,建立了1954年北京坐标系和1980西安坐标系与2000国家大地坐标的转换关系。实践验证了方案的可行性,实现了从地方坐标到CGCS2000坐标系的统一。

The CGCS2000 coordinate datum,which is a three-dimensional,geocentric,dynamic,local and high-precision datum,is an important part of the construction of modern mapping datum system in China,and the unification of the stock data to CGCS2000 coordinate datum is of far-reaching significance.Taking Yunfu City as an example,in order to ensure the conformity and correctness of the coordinate conversion parameters,the C-level GNSS geodetic control points were encrypted and the existing C-level GNSS points were measured jointly,the two-dimensional seven-parameter conversion model was selected,and the conversion relationship between the 1954 Beijing coordinate system and 1980 Xi'an coordinate system and the 2000 national geodetic coordinates was established.Practice has verified the feasibility of the scheme,and has realized the unification from the local coordinates to the CGCS2000 coordinate system.