This paper introduces the necessity and importance of final survey of underground water supply line, expounds the contents of and methods for the surveying, and advances some suggestions.
介绍了城市地下给水管线竣工测量工作的必要性和重要性，阐述了测量的内容及施测方法，提出了一些建议。
2
Application to a conduit project shows that the system can be applied to the construction and safety monitoring of underground projects surveying.
通过在顶管工程中的实际应用，表明系统在地下工程施工、安全监测中均有较好的应用价值。
3
Ground penetrating radar (GPR) has been used widely in the underground metal mines, and the results of surveying are often influenced by the complicated subsurface environment.