Abstract：GPS RTK and CORS technology had been widely used in topographic mapping, aerial photogrammetry, cadastral surveying and other work. It was characterized by fast speed, and that three dimensional coordinates of points could be obtained without visibility between points. Its accuracy was centimeter level. In high accuracy measurement, grade D GPS measurement was still an irreplaceable choice. Based on this, combined with the example of grade D GPS control survey in Guanzhuang exploration area of Tongchuan mining area in Weibei Carboniferous Permian coalfield, Shaanxi Province, this paper focused on the requirements of field implementation steps and data processing methods, discussed the formula derivation process and analyzed the results.
