该方法合理利用多期测量资料，且计算简单、方便，能有效提高长大隧道洞内控制测量成果的精度。
The method utilize survey data rationally, and calculation is simple and easy. It can effectively increase the accuracy of the control survey result in long straight tunnels.
能有效提高洞内控制测量成果的精度，为长大隧道的控制测量提供了可借鉴的经验。
The accuracy of control measuring inside the tunnel is improved. As a result an experience is gained for control measuring of long large tunnel.
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