2、数字化后的得到的坐标其实不是WGS84的经纬度坐标，因为54和80的转换参数至今没有公布，一般的软件中...
You can try converting some of the Northing, Easting coordinates to Latitude and Longitude, and viewing the plot of land onGoogle Mapsto verify their accuracy. Like all floating-point computations, converting back and forth between Lat/Lon and SVY21 will cause the loss of precision. ...