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随着光电测距仪测距精度不断提高,在施工控制测量中已出现了较多的测边网。例如大地四边形测边网、多边中心形测边网和对角线较多的复杂测边网。这些网的精度估算或计算,在一些刊物上已有论述。水工隧洞施工控制网的布设与精度估算,都与一般的施工控制网有所不同。水工隧洞施工控制网均为狭长带状,短则几百米,几公里,长达十几公里。控制网的布设一般多采用由三角形组成
With the continuous improvement of the optical range finder ranging accuracy, in the construction control measurement has appeared more than measuring edge net. For example, the geodesic edge net, polygon center edge net and diagonal more complex edge net. The estimation or calculation of the accuracy of these networks has been discussed in several publications. Hydraulic tunnel construction control network layout and accuracy estimates, with the general construction control network is different. Hydraulic tunnel construction control network are long strip, a few hundred meters short, a few kilometers, up to ten kilometers. Control network layout generally use more by the triangle