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。
Bad coordinates are reflected in the absence of associated point geometry values, and the trigger procedures fail silently.
矢量数据指的是通过几何结构定义的数据，如线段表示街道，而点表示位置。
Vector data refers to data defined by geometric constructs, such as line segments representing a street or points representing single locations.
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。
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.
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。
The inner call, to ST_Point(), creates a point geometry with latitude-longitude coordinates (SRID = 1).
当更新源表中的坐标列时，必须构造一个新的点几何值。
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
创建和使用几何值(比如点)需要DB 2Spatial Extender。
Creating and using geometry values such as points requires the DB2 Spatial Extender.
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。
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.
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。
Creating a feature requires that you also create a geometry, such as a point or line, and associate it with the feature.
从几何上看，函数可以用这个图像表示，固定某个点。
So, geometrically, my function can be represented by this graph, and I fix some point,.
例如，图2表现了金字塔形几何形状中一个量子点的第四能级。
For example, Figure 2 represents the fourth energy level for a quantum dot in a pyramidal geometry.
空间数据可能变得非常复杂，需要很多空间来存储一个几何图形中各个点的信息。
Spatial data can become rather complex and require quite a lot of space to store the information of the points that form a geometry.
不过，现在我们需要知道多一点，它到底是什么，在物理上的意义是什么，怎样几何直观地想像等等。
But, for now we need to try to figure out a bit more about this, what it says, what it means physically, how to think of it geometrically, and so on.
如果由于稍微复杂一点儿的几何图形导致更多的数据不能以内联方式存储，那么这里演示的差异还要大大增加。
If more data could not have been stored inline due to slightly more complex geometries, the demonstrated differences could have been multiplied.
记不记得几何里所学的3点成面？
下面是方法,像点乘中一样，是个几何方法。
Now comes my method number two as we had with the dot product, is a geometrical method.
尽管三角形并不能定义一个可见的几何图形，但可使 M3G 拥有更多的控制点（要计算的数量也更多）。
Although the triangles wouldn't define a visible geometry, they would give M3G more control points (and more numbers to calculate).
曾几何时，游客们中的绝大多部可能会同意世界源起于公元前4004前，或更确切地说，最初点便是那年的10月23日星期天。
At that point, most of the visitors would probably have agreed that the world had begun in 4004 BC, to be precise at the very beginning of Sunday 23 October.
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。
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.
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。
This paper proposes a geometry image representation based progressive transmission of point cloud surface on the network.
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。
Characteristic points can be extracted by considering the geometry definition, 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。
Lastly, the characteristic points can be extracted by the geometry definition of them and the position and curvature of each point on the contours.
技术说明书有一点不同之处，还应包括有关工厂几何条件的图纸，说明工厂的外型、大小和相关细节。
Now the technical spec. is slightly different It should include the drawings defining the geometry of the plant, which show the form, dimensions and details.
建筑的凹处和点光源强调了区分室内、外的几何形态。
Alternating cove and spot lights accentuate the geometric angles used to delineate the interior and exterior Spaces.
建模应用程序通常显示几何顶点的数量，例如构建模型不同角点的数量。
Modeling applications usually display the geometric vertex count, i. e. number of points that make up a model.
本文分析表明，刘易斯二元经济增长模型实际上是一个AK模型，这一点是以几何图示给出的刘易斯模型所无法揭示的。
In fact, Lewis' economy growth model is an AK model which has not been disclosed by geometric styled Lewis' model.
自动中心转线任何揭露，部分可见的或对称的几何块一点。
Automatically center the TransPose line on any unmasked, partially visible or symmetrical piece of geometry with one click.
平面在点几何中是二维的。
建模应用程序通常显示几何顶点的数量，例如构建模型不同角点的数量。
Modeling applications usually display the geometric vertex count, ie, the number of distinct corner points that make up a model.
计算结果表明，电导图谱及其共振峰的劈裂依赖于量子点的几何尺寸、量子点的数目及量子点中势的大小。
The results indicate that the conductance and the resonant splitting are dependent on the structural dimension, the number of quantum dots and the strength of negative potential.
计算结果表明，电导图谱及其共振峰的劈裂依赖于量子点的几何尺寸、量子点的数目及量子点中势的大小。
The results indicate that the conductance and the resonant splitting are dependent on the structural dimension, the number of quantum dots and the strength of negative potential.
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