Journal of Geodesy and Geoinformation Science ›› 2019, Vol. 2 ›› Issue (1): 17-25.doi: 10.11947/j.JGGS.2019.0103

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Grid Model for High-accuracy Coordinate Transformation of China Geodetic Coordinate System 2000

Zhiping LU1,Ziqing WEI2,Jun LI3,Chong GUO1   

  1. 1. Information Engineering University, Zhengzhou 450052, China
    2. Xi’an Institute of Surveying and Mapping, Xi’an 710054, China
    3. Xi’an Technical Division of Surveying and Mapping, Xi’an 710054, China
  • Received:2018-07-04 Accepted:2019-01-10 Online:2019-03-20 Published:2020-03-20
  • About author:Zhiping LU (1960—), male, PhD, professor, PhD supervisor, majors in the research and teaching of geodetic reference system and GNSS surveying data processing. E-mail: ssscenter@126.com
  • Supported by:
    The National Natural Science Foundation Program(41674019);The National Plan on Key Basic Research and Development of China(2016YFB0501701)

Abstract:

After implementing CGCS2000, establishing grid models for high-accuracy coordinate transformation which are mainly used to transform border lines and coordinate grids of topographic maps becomes an important issue in mapping applications. Consequently, a grid model for high-accuracy coordinate transformation of CGCS2000 is proposed. Specifically, we firstly analyze a minimum curvature equation of coordinate transformation, which possesses the characteristics of both the global and local smoothness, achieving better consistency with the consecutive smoothness for the coordinate transformation of map’s linear feature. Then an iterative calculation method of grid nodes and an approach for establishing regional grid models based on collocation by two-step minimization are proposed. Meanwhile, a data structure of grid model is constructed. Finally we give the optimized grid interval and transformation accuracy in China corresponding to the proposed grid model. Using 48433 points of 2000 National Geodetic Control Network of China, we take the proposed model into practice by constructing grid models for coordinate transformation from BJS54 and XAS80 to CGCS2000, and the external positional accuracies for both models are 0.26m and 0.03m respectively.

Key words: CGCS2000; coordinate transformation; minimum curvature method; grid model; data structure; collocation