Clearly tell everyone: arctoolbox cannot convert BEIJING 54 or Xi'an 80 coordinate system to WGS84

We often hope that the arctoolbox tool can be used for Coordinate Transformation to convert the coordinate system in beijing 54 or Xi'an 80 to WGS84. In fact, this is not accurate, the projection coordinates of beijing 54 or Xi'an 80 can be computed and converted to the corresponding geographic coordinate system. However, since the conversion parameters from the coordinate system in beijing 54 and Xi'an 80 to WGS84 are not disclosed, therefore, it is impossible to accurately calculate the coordinates from WGS84. Other coordinate systems that disclose conversion parameters can be converted in arctoolbox. You can consider using the open-source project proj. Net for conversions in a program. view the transformation between multiple Coordinate Systems: proj. net