The form of electronic total station and the basic principle of determining and setting up root control points were related briefly. The accuracy of setting up root control points was analysed.
简述全站仪的构成及测设图根控制点的基本原理，分析布设图根控制点的测量精度并得出结论。
The results show that the root mean square error(RMSE) of the control points obtained by the workflow is lower than 0.5 pixels.
结果表明，使用该方法选取的控制点均方根误差（RMSE）可以控制在0.5个像素以内。
But, in the control and treatment of environment polluting, we often lose the root points of problem, so as to make the pollution problem more and more serious.
但是在治理方面，往往因抓不住根源问题，致使污染现象越来越严重。
But, in the control and treatment of environment polluting, we often lose the root points of problem, so as to make the pollution problem more and more serious.
但是在治理方面，往往因抓不住根源问题，致使污染现象越来越严重。
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