测边后方交会精度研究及其应用

结合苏通大桥加密点测量，就两点测边后方交会的坐标计算和精度等进行了分析，并对2点的构形情况进行了探讨．此外，用严密平差程序对3点及以上测边后方交会进行了多组合计算．结果表明，3点及以上测边后方交会平差后的点位中误差和坐标比两点测边后方交会精度高．研究成果已应用于苏通大桥加密点测量，其正确性得到了证明．

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 llnear-resection 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 linearresection 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.