BoundsExtractor
Extracts the minimum and maximum values of the feature’s coordinates into new attributes.
It determines the extreme values of the feature in each of the x and y (and optionally z) axes, and assigns these values to the resulting attribute names.
This transformer does not change the geometry of the original feature.
Parameters
The names of the attributes to be assigned the minimum and maximum values of the feature along the X, Y, and Z axes. If the feature has only two dimensions, the Z Attributes will be set to 0. All of these parameters are optional.
Example
As each feature enters the transformer, it has six new attributes added to it to hold the extents of the feature.
If a feature had the coordinates (1,10,100), (2,-20,150), then after leaving the transformer, it would have these new attributes with these values:
Attribute | Value |
---|---|
_xmin |
1 |
_xmax |
2 |
_ymin |
-20 |
_ymax |
10 |
_zmin |
100 |
_zmax |
150 |
Editing Transformer Parameters
Using a set of menu options, transformer parameters can be assigned by referencing other elements in the workspace. More advanced functions, such as an advanced editor and an arithmetic editor, are also available in some transformers. To access a menu of these options, click beside the applicable parameter. For more information, see Transformer Parameter Menu Options.
Defining Values
There are several ways to define a value for use in a Transformer. The simplest is to simply type in a value or string, which can include functions of various types such as attribute references, math and string functions, and workspace parameters. There are a number of tools and shortcuts that can assist in constructing values, generally available from the drop-down context menu adjacent to the value field.
Using the Text Editor
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
Set values depending on one or more test conditions that either pass or fail.
Parameter Condition Definition Dialog
Content
Expressions and strings can include a number of functions, characters, parameters, and more.
When setting values - whether entered directly in a parameter or constructed using one of the editors - strings and expressions containing String, Math, Date/Time or FME Feature Functions will have those functions evaluated. Therefore, the names of these functions (in the form @<function_name>) should not be used as literal string values.
These functions manipulate and format strings. | |
Special Characters |
A set of control characters is available in the Text Editor. |
Math functions are available in both editors. | |
Date/Time Functions | Date and time functions are available in the Text Editor. |
These operators are available in the Arithmetic Editor. | |
These return primarily feature-specific values. | |
FME and workspace-specific parameters may be used. | |
Creating and Modifying User Parameters | Create your own editable parameters. |
Dialog Options - Tables
Transformers with table-style parameters have additional tools for populating and manipulating values.
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. |
Filter
|
Start typing a string, and the matrix will only display rows matching those characters. Searches all columns. This only affects the display of attributes within the transformer - it does not alter which attributes are output. |
Import
|
Import populates the table with a set of new attributes read from a dataset. Specific application varies between transformers. |
Reset/Refresh
|
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.
Usage Notes
- To accumulate the bounding box of a number of features, use the BoundingBoxAccumulator.
- To replace a feature with its bounding box, use the BoundingBoxReplacer.
FME Community
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Search for samples and information about this transformer on the FME Community.
Keywords: MBR "minimum bounding rectangle" "neatline envelope" "Topfer index"