MRF2DGeneralizer

每个功能,通过输出清洗端口将添加到指定功能是否被修改，创建，或在清洗过程中不变的一个新的属性“mrf_clean_status”。该属性的可能值“修改”，“创建”和“原始”。

如果选择，每个组的特征与在相同的值通过...分组attributes will be processed separately from other groups.

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

有使用两个典型原因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.

性能提升是最有可能当数据已经排序（或使用阅读SQL ORDER BY声明），因为更少的工作需要FME的。如果数据需要排序，它可以在工作区中进行排序（虽然增加的处理开销可能会抵消任何收益）。

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...分组同Process At End (Blocking)可能是等效的和简单的方法。

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.

Cleaning tolerance is used as the default tolerance unless the Feature Tolerance Attribute is specified and valid. The minimum tolerance allowed is 0.0.

在清洗数据中使用的层的数目是由输入特征的不同的公差值的数量来确定。具有相同特征的公差被处理为在同一层上。

The default value of Filter Factor is 1.0 and the minimum value is 0.0.

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.

Text Editor

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

Set values depending on one or more test conditions that either pass or fail.

参数条件定义对话框

内容

Expressions and strings can include a number of functions, characters, parameters, and more.

当设定值 - 无论是直接在参数输入或使用的编辑之一构造 - 字符串和表达式包含字符串，数学，日期/时间或FME特征函数将具有评价这些功能。因此，这些功能的名称（在形式@ <FUNCTION_NAME>) should not be used as literal string values.

内容类型

String Functions	These functions manipulate and format strings.
Special Characters	A set of control characters is available in the Text Editor.
Math Functions	数学函数在两种编辑器中可用。
Date/Time Functions	Date and time functions are available in the Text Editor.
Math Operators	These operators are available in the Arithmetic Editor.
FME Feature Functions	These return primarily feature-specific values.
FME Parameters	FME和工作区特有的参数可被使用。
创建和修改用户参数	创建您自己的可编辑参数。

Note:Not all tools are available in all transformers.