Conversion Method and Accuracy Analysis of 1980 Xi'an Coordinate System and the 2000 Coordinate System

By using different computing softwares,using three-dimensional seven-parameter coordinate transformation model and two-dimensional coordinate transformation model,the results gained by the 1980 Xi'an coordinate system can be transformed to the results of the 2000 coordinate system.Accuracy of checking points have been statisticed and analyzed.Not only the coordinate transformation methods and requirements have been introduced,but also the conditions and requirements of the application of two models have been gained as weill.