MRF2DDangleRemover

每个功能,通过输出清洁端口将具有新的属性“MRF_CLEAN_STATUS”，以指定在清洁过程中是否已修改，创建或不变的功能。此属性的可能值是“修改”，“创建”和“原始”。

If Dangle Action is set to Remove Short and Flag Long, for each feature that is a dangle but is longer than this tolerance, a point, label, or circle (depending on the value of Flag Type) will be output through the标记port.

如果选择，则每组具有相同值的功能通过...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

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.

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

用于清洁数据的层数由输入特征的不同公差值的数量决定。具有相同公差的特征被处理为在同一层上。

默认值为1.0，最小值为0.0。

If Dangle Action is set to Remove Short and Flag Long, for each feature that is a dangle but is longer than this tolerance, a point, label, or circle (depending on the value of Flag Type) will be output through the标记port.

对于悬挂的每个功能但长于标志尺寸公差，此参数将标志类型设置为点，标签或圆圈，如果设置为拆除短而标记长。

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.

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

String Functions	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。
Date/Time Functions	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	These return primarily feature-specific values.
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.