结合测量经验，探讨了用GPS与EDM导线建立小水电工程地面控制网的方法，并以实例加以介绍。
Combined with survey experience, the author probed into the methods of setting up ground control net with GPS and EDM lead for small hydropower projects based on the introduction of practice examples.
分析了地面控制网、井下导线测量、立井定向和加测陀螺定向边对贯通大型巷道精度的影响；讨论了提高测量精度的可行性方法。
It discusses the influence of ground control network, underground traverse survey, shaft orientation and gyroscopic orientation edge append-survey on breakthrough precision.
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