Performs warping operations on the spatial coordinates of features. It is used to adjust a set of observed input features according to a spatial transform defined by a set of control vectors.该变压器基于的仿射器（比例，旋转和偏移）变换控制vector features and applies this transformation to theObserved生成输出的功能，并在整个集合时产生良好的校正Observed数据需要单个转换。
每一个控制feature represents a control vector (a 2-point line feature) whose start point is at some location in the originalObserved数据空间，其终点位于所需输出数据空间中的相应位置。每个控制矢量表示从观察到的顶点到所需顶点所需的校正，就方向和距离。只有一个点的控制向量被解释为要求该位置从观察到的数据集更改为参考数据集。这通常被称为扎带。
控制矢量可以存储在任何格式的数据集中，并读入FME，或者直接生成FME工作区，这通常是当向量预先知道的并且必须从传入数据生成时的情况。
输入端口
必须将两组功能路由到此变压器中。
控制
Features that enter the控制port represent the control features used to compute the corrections.
Observed
Features that enter theObserved端口是将纠正的功能。
Output Ports
Corrected
修改了Observed通过输出功能Correctedport.
Parameters
变压器
通过...分组
The default behavior is to use the entire set of input features as the group. This option allows you to select attributes that define which groups to form. Each set of features that have the same value for all of these attributes will be processed as an independent group.
通过...分组Mode
Process At End (Blocking): This is the default behavior. Processing will only occur in this transformer once all input is present.
Process When Group Changes (Advanced): This transformer will process input groups in order. Changes of the value of the Group By parameter on the input stream will trigger processing on the currently accumulating group. This may improve overall speed (particularly with multiple, equally-sized groups), but could cause undesired behavior if input groups are not truly ordered.
Considerations for Using通过...分组
使用两种典型的原因Process When Group Changes (Advanced). The first is incoming data that is intended to be processed in groups (and is already so ordered). In this case, the structure dictates Group By usage - not performance considerations.
The second possible reason is potential performance gains.
最有可能在已经对数据进行排序的（或使用A读取SQL ORDER BY声明）由于FME需要更少的工作。如果数据需求排序，则可以在工作区中排序（尽管添加的处理开销可能会否定任何增益）。
Sorting becomes more difficult according to the number of data streams. Multiple streams of data could be almost impossible to sort into the correct order, since all features matching a通过...分组value need to arrive before any features (of any feature type or dataset) belonging to the next group. In this case, using通过...分组和Process At End (Blocking)可能是等同和更简单的方法。
Note: ">Note:Multiple feature types and features from multiple datasets will not generally naturally occur in the correct order.
As with many scenarios, testing different approaches in your workspace with your data is the only definitive way to identify performance gains.
Usage Notes
- The橡胶鹰transformer provides similar functionality but applies a different transformation to eachObservedvertex, depending on its distance to nearby控制vectors。这使得这使得橡胶鹰more appropriate for cases when the distortions in the data are not constant.
- 还请看看Affiner, which performs an affine transformation on the coordinates of the feature.
编辑变换器参数
使用一组菜单选项，可以通过引用工作区中的其他元素来分配变压器参数。一些变压器也可提供更高级的功能，例如高级编辑器和算术编辑器。要访问这些选项的菜单，请单击
除适用的参数旁边。有关更多信息，请参阅变压器参数菜单选择ions.
定义值
有几种方法可以在变压器中定义使用的值。最简单的是简单地输入值或字符串，其可以包括各种类型的函数，例如属性引用，数学和字符串函数和工作区参数。有许多工具和快捷方式可以帮助构造值的值，通常可以从与值字段相邻的下拉上下文菜单中提供。
How to Set Parameter Values
使用文本编辑器
The Text Editor provides a convenient way to construct text strings (including regular expressions) from various data sources, such as attributes, parameters, and constants, where the result is used directly inside a parameter.
Using the Arithmetic Editor
The Arithmetic Editor provides a convenient way to construct math expressions from various data sources, such as attributes, parameters, and feature functions, where the result is used directly inside a parameter.
Conditional Values
根据通过或失败的一个或多个测试条件设置值。
内容
Expressions and strings can include a number of functions, characters, parameters, and more.
设置值 - 无论是否直接在参数中输入或使用其中一个编辑器和包含字符串的表达式都是构造的，都会评估这些函数的字符串和表达式。因此，这些函数的名称（以@ <function_name.>) should not be used as literal string values.
内容类型
| These functions manipulate and format strings. | |
Special Characters |
A set of control characters is available in the Text Editor. |
| 两个编辑器都有数学函数。 | |
| 日期/时间函数 | Date and time functions are available in the Text Editor. |
| These operators are available in the Arithmetic Editor. | |
| These return primarily feature-specific values. | |
| 可以使用FME和工作区的参数。 | |
| 创建和修改用户参数 | 创建自己的可编辑参数。 |
对话框选项 - 表格
具有桌面参数的变压器具有填充和操作值的其他工具。
表工具
Row Reordering
|
Enabled once you have clicked on a row item. Choices include:
|
Cut, Copy, and Paste
|
Enabled once you have clicked on a row item. Choices include:
Cut, copy, and paste may be used within a transformer, or between transformers. |
筛选
|
开始键入字符串，矩阵仅显示匹配这些字符的行。搜索所有列。这仅影响变换器内的属性的显示 - 它不会更改输出哪个属性。 |
进口
|
进口populates the table with a set of new attributes read from a dataset. Specific application varies between transformers. |
重置/刷新
|
Generally resets the table to its initial state, and may provide additional options to remove invalid entries. Behavior varies between transformers. |
Note:Not all tools are available in all transformers.
FME许可级别
FME专业版及以上
FME社亚搏国际在线官网区
The FME Community is the place for demos, how-tos, articles, FAQs, and more. Get answers to your questions, learn from other users, and suggest, vote, and comment on new features.
搜索有关此变压器的样本和信息FME社亚搏国际在线官网区.
关键词：POINTCLOUD.