GNSS-PPK技术在城市地形图高程测量中的应用

Application of GNSSPPK technology in urban topographic map elevation measurement

本文以某市1∶2 000地形图生产与更新项目为例,详细介绍了全球导航卫星系统动态测量数据后处理(GNSS-PPK)技术在地形图高程注记点测量中的应用,包括数据处理方法和步骤等,并采用常规实时动态测量(RTK)对成果精度进行了检测和验证,从而为大比例尺城市地形图高程注记点测量提供了一种解决方法。结果表明,基于GNSS-PPK技术的车载高程测量,可以快速施测硬化路面的高程注记点。经精度评定,该技术施测的硬化路面上高程注记点的高程中误差优于10 cm,满足《城市测量规范》中“城市建筑区的高程注记点相对于邻近图根点的高程中误差不应大于0.15 m”的要求,且该方法能够提高工作效率,可为广大测绘工作者提供参考。

Taking the 1∶2,000 topographic map production and update project in a city as an example,this paper describes in details the application of GNSSPPK technology in field operations of topographic map elevation annotation point measurement,including data processing methods and steps.The conventional RTK technology is used to detect and verify the accuracy of the results,so as to provide a solution for the measurement of elevation annotation points in largescale urban topographic maps.The results indicate that vehicleborne elevation measurement based on GNSSPPK technology can quickly measure the elevation annotation points of hardened road surfaces.According to the accuracy evaluation,the vertical mean square error of the elevation annotation points on the hardened road surface measured by this technology is better than 10 cm,which meets the requirement of“the vertical mean square error of the elevation annotation points in urban building areas relative to adjacent map root points should not exceed 0.15 m”specified in the Urban Survey Specification.Moreover,this method is helpful for saving manpower and time,and improve work efficiency,which can provide reference for surveying and mapping professional.