Abstract
Abstract. In the working of the existing reference coordinate system transformed into the coordinate system of the geocentric coordinate system, many experts and scholars have in-depth research on the transformation methods such as geodetic control point results (including GNSS base station coordinates, GNSS control point coordinates, triangle point coordinates), basic geographic information data results (including DLG, DOM, DEM, DRG, DSM, etc.) and other spatial information data. On the basis of these studies, many provinces and cities have completed the coordinate system transformation of surveying and mapping results in China. This paper expounds the method of transforming the existing reference coordinate system into the geocentric coordinate system, summarizes and sorts out the common quality problems in the process of different data and different methods, and analyses the causes of the problems and the impact on the transforming results. Based on the above work, The paper provides reference and suggestions for the transforming work, which is aimed to improve the transformation quality in the future.
Highlights
Before the 1950s, in order to study the shape of the local earth's surface, we reduce the ground measurement data to the minimum correction of the ellipsoid and select the reference ellipsoid and the land of the region where it is located
In the actual transformation work, a series of theoretical research and actual transformation work were carried out on the actual situation of the transformation results, some quality problems were still found in the quality inspection of the transformation results
The quality problems in the transformation results are analysed, the causes of the problems are analysed, and the methods to solve the problems are proposed. These methods are applied to the coordinate transformation work of 9 provinces and 3 cities, avoiding the corresponding quality problems
Summary
Before the 1950s, in order to study the shape of the local earth's surface, we reduce the ground measurement data to the minimum correction of the ellipsoid and select the reference ellipsoid and the land of the region where it is located. Since July 1, 2018, the competent departments of surveying and mapping geographic information no longer provide spatial information results of non-China Geodetic Coordinate System 2000s. Professor Chen, J.Y. and Ning, J.S. totally introduced the construction, refinement, maintenance, and updating of the CGCS2000, and introduced the national-level surveying and mapping production which can be used for the transformation work. Professor Cheng,Y.Y., Guo,C.X., Lü,Z.P., Wang,W.L. and Pang,S.Y. studied the transformation methods of GNSS reference stations, geodetic control points, and 4D products. Professor Cheng, P.F., explores a method to inspecting the coordinate transforming results. X.H. explores a method for quality inspection of coordinate transformation results. This paper first introduces the transformation of the Geodetic control points results and the transformation of basic geographic information results, and analyses the common quality problems of the results in the coordinate system transformation process. Based on the analysis of the causes of common quality problems in coordinate system transformation results, the corresponding solutions for various problems are given
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