Applying this method on the result of ST_Envelope, which always returns a polygon for any non-empty geometry, gives us the single point we need.
将这个方法应用到ST_Envelope(对于任何非空的几何图形，它总是返回一个多边形)的结果上将得到我们需要的那个点。
The paper was emphasized to demonstrate and present influencing factors sifting method, principles to divide polygon mesh units and to check predicted exactitude evaluation.
文章重点论证和提出了影响因素筛选、多边形网格单元划分的原则及预测精度评价的原理方法。
The 0.618 method and the convex polygon method for minimum condition evaluation of straightness error are introduced, and their high-level language programs are given in this paper.
本文介绍了直线度误差最小评定的0.618法和凸多边形法，并给出了这两种方法的高级语言程序。
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