The inner call, to ST_Point(), creates a point geometry with latitude-longitude coordinates (SRID = 1).
内部调用（对 ST_Point()）创建一个具有纬度-经度坐标（SRID = 1）的点几何值。
Bad coordinates are reflected in the absence of associated point geometry values, and the trigger procedures fail silently.
错误的坐标表现为缺少相关联的点几何值，触发器过程会悄悄地终止。
When either of the coordinate columns in the source table is updated, a new point geometry must be constructed. The update trigger looks like this
当更新源表中的坐标列时，必须构造一个新的点几何值。
Then a new method is proposed to measure indirectly cutting angles of drills with arbitrary point geometry by measuring the curve of the main edge projected.
以此为基础，提出一种通过测量主刃投影曲线间接测量主刃各点切削角度的新方法，较好地解决了任意刃形钻头切削角度的测量问题。
We take a point on the geometry — the centroid — compute the value for that point on the space filling curve, and store the result in an additional column.
我们在几何图形上取一个点，即形心点，计算那个点在空间填充曲线上的值，并将结果存储在一个附加的列中。
Creating a feature requires that you also create a geometry, such as a point or line, and associate it with the feature.
创建一个特性还需要创建一个几何形状，比如一个点或线，并将它与此特性相关联。
The spatial table has a simple structure: a unique, integer column (objectid), one or more columns making up the primary key (copied from the source table), plus a single point-geometry column.
空间表的结构很简单：一个惟一的整数列(objectid)，组成主键的一个或多个列(从源表复制的)，以及一个点几何列。
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。
By choosing the suitable "referenced point" and defining "space Grade", this article gives geometry meaning to multi - dimension space.
本文通过选择合适的“参考点”和提出“空间级”概念，给出了多维空间的几何意义。
This paper proposes a geometry image representation based progressive transmission of point cloud surface on the network.
文章提出了基于几何图像表示的点云曲面网络渐进传输方法。
Characteristic points can be extracted by considering the geometry definition, the position and curvature of each point on the contours.
然后根据特征点的几何定义，利用轮廓线的位置、曲率等信息自动提取特征点。
Lastly, the characteristic points can be extracted by the geometry definition of them and the position and curvature of each point on the contours.
根据特征点的几何定义，利用轮廓线的位置信息、曲率等属性来提取特征点。
The problem of attaining the tangent equation of a certain point on a quadratic curve is basically solved in plane analytical geometry.
平面解析几何对“求过二次曲线外的点所引曲线切线的方程”的问题，未给出一般的方法和公式。
This paper probes into the number of straight lines which intersects hyperbola only in one point from algebra and geometry perspectives, and provides the general conclusion.
从代数及几何角度探索了与双曲线仅交于一点的直线的条数，并给出了一般结论。
With the differential geometry and engagement theories, induced curvature formulas of point engagement were deduced, and the formula of the local contact areas was given.
利用微分几何和啮合原理推导出该机构的点啮合的诱导曲率方程，给出了接触域大小的计算公式。
The axis skeleton, the information of geometry and topology of skeleton point were got after preprocessing of model.
首先，对经过预处理的模型进行骨架提取，并记录每个骨架点相应的几何和拓扑结构信息；
The scattering light of bubble is analysed from the point of view of geometry optics, from which it is concluded that the fluctuation of light intensity has some relation with the diameter of bubbles.
从几何光学的角度出发分析了气泡对光的散射，得出散射光强的波动特性与气泡的直径存在一定的关系。
The coordinate of a certain point, the distances between points and distances from point to line are directly calculated with the analytic geometry formula.
用解析几何的公式直接计算某个点的坐标、点与点之间的距离、点到直线的距离等。
The design of the bridge is based on a structural logic that takes, as its starting point, the principle that the geometry is determined by the forces at work.
这座桥的设计以结构力学作为其出发点，由力的的作用决定它的几何形体，而不是根据自身喜好选择桥梁的形体。
Another demonstrating method on the conclusion of the system with three virtual hinges at infinite point being variable in geometry is brought out.
对三虚铰在无穷远处体系为非几何不变的结论提出了另一种论证方法；
From the point of view of geometry, the new method is proposed by using the concept of relational grade in grey system theory.
本文利用灰色系统理论中的关联度概念，从几何处理的角度，提出一种新方法。
This paper discusses the problem of covering an ordered point set by a sequence of rectangles with minimum width in the area of computational geometry.
讨论了计算几何学中的矩形条覆盖问题，提出解决该问题的一个有效算法，并对提出的算法进行了分析。
Firstly, the Green function's source point and field point symmetry and geometry symmetry are discussed, and based on these, symmetry properties used in the matrix solving are discussed.
首先分析了格林函数的场点源点对称性和几何对称性，并由此入手，对对称性在速度势求解矩阵中的应用进行了分析。
The geometric continuity of two regular curves at the connection point can be discussed from differential geometry and Algebra.
关于两段正则曲线在公共节点处的几何连续性的问题可以从微分几何和代数的角度考虑。
Hit testing: Determining whether a specified coordinate (point) or geometry is contained within the bounds of a visual.
命中测试：确定指定的坐标(点)或几何图形是否包含在可视对象的边界内。
However, the spatial data model of main GIS systems only reflect knowledge of management and manipulation objects in field of cartography, such as point, line and poly geometry objects.
当今的GIS系统的空间数据模型，主要反映地图制图领域的点、线、面对象管理与操作的几何知识。
Editing in 3d environment by a digital control plane, the method can deal with some geometry efficiently, such as point, line, and polygon, etc.
由数字控制平面的3d环境中的编辑，该方法可以处理一些几何效率，如点，线，多边形等。
This algorithm takes a height field and also converts it into geometry, but it splits the terrain up in smaller chunks, so when the focal point changes, not all chunks have to be regenerated.
这个算法使用高度图，也使用几何变换，但是它将高度图和小块地形分开，所以当焦点变化时，不需要重新生成所有的小块地图。
This algorithm takes a height field and also converts it into geometry, but it splits the terrain up in smaller chunks, so when the focal point changes, not all chunks have to be regenerated.
这个算法使用高度图，也使用几何变换，但是它将高度图和小块地形分开，所以当焦点变化时，不需要重新生成所有的小块地图。
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