The three dimensional design theory of the grooved drum trench curved surface includes: 1)the indirect and direct design of the bottom datum curve;
槽筒沟槽曲面三维设计理论包括：1）槽底基准曲线的间接设计与直接设计；
Should regard initial data in the charts of route location and curve elements as datum that coordinates calculate will just get the datum of high accuracy, Guide constructing accurately.
应以路线固定表和曲线要素表中的原始数据为基准推算坐标才会得到更高精度的数据，精确指导施工。
Analyzing the experimental datum by regression, it draws the different influences of the modification of the weights of two kinds of control points on length of NURBS curve.
将实验数据回归分析，在此基础上得出两类控制顶点权因子的改变对NURBS曲线长度不同的影响结果。
Through datum regression analysis and comparing, the HSC strength curve of Hebei province is established, and as a reference to national HSC curve.
通过对试验数据的回归分析比较，提出了河北省高强混凝土测强曲线，并为建立全国高强混凝土测强曲线提供了参考依据。
It is important to paint the project curve and the smooth project curve meanwhile it is practical to generate the transitive datum in engineering computation.
对绘制工程曲线、光滑工程曲线以及产生工程计算中的过渡点具有实用意义。
The fitted curve is smooth and continuous. The accumulated chord length is used as virtual interpolation datum axis.
然后用累加弦长作为虚拟的插补基准轴，提出了一种基于虚拟基准轴的插补新算法。
The fitted curve is smooth and continuous. The accumulated chord length is used as virtual interpolation datum axis.
然后用累加弦长作为虚拟的插补基准轴，提出了一种基于虚拟基准轴的插补新算法。
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