Accuracy Analysis of Linear-Resection and Its Application in Control Measurement of Sutong Bridge

The calculation of coordinates and the accuracy analysis for two-point linearresection were conducted by taking the Sutong bridge as the research object,and the formation of two points were discussed.Furthermore,the coordinates and positional accuracy of three-or more-point linear-resection were calculated by a rigorous adjustment program.The research result indicates that three-or more-point linear-resection has a higher accuracy of mean square error of point positions and coordinates after they are adjusted than two-point linear-resection.The research results have been applied to the pass point measurement of the Sutong bridge and proven to be correct.