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在三峡工程大江截流进程中，随着深水围堰戗堤进占，裹头水位观测的平面位置是一个平行于围堰轴线的动态轨迹。采用无人立尺测量技术代替常规设尺法接测水位，可消除堤头坍塌和施工车辆振动等因素对水位精度的影响，并且目标位置可根据需要随时变动。通过接测水位精度验证３０组试验结果表明，利用该方法所测水位成果满足规范要求，且解决了水位观测员的安全问题。最后分析了影响水位接测精度的因素，包括测距误差、天顶距测量误差、垂直角等，并给出了控制范围。
In the process of the closure of the Three Gorges Project, as the embankment of the deepwater cofferdam is dug up, the plane position of the water level at the head of the wrap is a dynamic trajectory parallel to the axis of the cofferdam. The use of unmanned vertical measuring technology instead of the conventional measuring method to measure the water level can eliminate the influence of slump of embankment head and construction vehicle vibration on the water level accuracy and the target position can be changed at any time according to the need. The results of 30 groups of tests verified by the water level accuracy test showed that the results of the water level measured by this method met the specifications and solved the safety problems of water level observers. Finally, the factors influencing the accuracy of water level measurement are analyzed, including ranging error, azimuth measurement error, vertical angle and so on, and the control range is given.