GPS高程拟合在公路断面测量中的应用

针对地形起伏较大的公路，水准测量断面效率低下的问题，本文运用RTK测量手段和分区平面拟合的方法来解决带状地形高程异常转换问题。依托CORS基站差分信号，得到平面精度为3 cm的纵断面放样和横断面采集数据。通过剔除法选择最优的转换控制点及分区平面拟合方式实现大地高转换为正常高，该方法减轻了外业作业强度，满足了公路断面测量精度，且最终高程转换中误差小于5 cm。

Application of GPS elevation fitting in highway section measurement

In view of the low efficiency of leveling section in the highway with large undulation, this paper uses the method of RTK and partition plane fitting to solve the problem of elevation anomaly transformation in the belt terrain. Based on the CORS, it is enabled to acquire the accuracy of 3 cm of plane error for determining the center line of road and collecting the GPS coordinate of road cross-section. In order to solve the problem of height anomaly, we use stepwise selection method to select the best location of control point and partition plane fitting method for changing GPS elevation into normal elevation, and the accuracy of elevation transformation is less than 5 cm.