邻居aggregator.

如果你没有选择通过...分组属性，然后所有功能都属于同一组。

当你选择通过...分组attributes, this transformer will aggregate the geometries of the input features, based on the selection in the通过...分组参数。每个具有相同值的特征组通过...分组属性将独立于其他组进行处理。

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...分组借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.

这些参数在接地单元中测量，将输入空间划分为单元格。结果是细胞网格，其围绕起点（0,0）的所有方向扩展。每个输入功能的边界框的中心用于确定要素的单元格。一旦读取所有输入功能，从每个单元格中的所有功能都会创建聚合功能。如果输入线性特征，则它们将在其单元格中删除伪节点，以进一步减少单独的实体的数量。没有这样的减少对进入的任何多边形或甜瓜进行。

Note: ">Note:To view the grid of cells that is created from these parameters, use the2DGridCreator。指定0,5对于Starting X Coordinate和Starting Y Coordinate, respectively, and the same values forColumn Width和Row HeightasNeighborhood Width和邻里高度, respectively.

When you set this parameter, neighborhoods with fewer than the specified number of features are merged with a vertical neighbor area in order to increase the number of members. You can prevent this from happening by setting the parameter to 0 (zero).

如果删除传入的属性选择，输出功能将不会保留任何输入属性。如果Merge Incoming Attributesis chosen, the output feature will merge all input attributes. IfUse Attributes From One Featureis chosen, the output feature will get attributes from only one input feature.

如果aList Name指定了，然后输入功能的所有属性将作为输出特征中列表属性条目的一部分存储。

Note: ">Note:列表属性are not accessible from the output schema in Workbench unless they are first processed using a transformer that operates on them, such aslist exploder.要么ListConcatenator。Alternatively,AttributeExposercan be used.

All Attributes：从创建输出功能的所有输入功能中的每个属性都将添加到指定的列表中List Name。

选定的属性：只有所指定的属性选定的属性参数将添加到指定的列表中List Name。

The attributes to be added to the list when添加到列表is选定的属性。

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.

文本编辑器

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.

算术编辑器

Conditional Values

根据通过或失败的一个或多个测试条件设置值。

参数条件定义对话框

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

字符串函数	These functions manipulate and format strings.
Special Characters	A set of control characters is available in the Text Editor.
Math Functions	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.
Math Operators	These operators are available in the Arithmetic Editor.
FME功能功能	这些主要是特定于特征的值。
FME参数	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。

Note:Not all tools are available in all transformers.