BoundsExtractor

Extracts a feature’s minimum and maximum coordinate values into attributes.

Typical Uses

Determining a feature’s extents as attribute values instead of geometry.

How does it work?

The BoundsExtractor receives features with any type of geometry and individually extracts their minimum and maximum x, y, and z coordinate values, storing them as attributes.

Where coordinate values do not exist (such as z values on 2D geometry or non-spatial features) a value of zero (0) is assigned.

To exclude an attribute, leave the parameter blank and it will not be added to the output features.

Feature geometry is unchanged.

Examples

Usage Notes

Point cloud extents need to be recalculated after some operations. Consider using the PointCloudPropertyExtractor and its Calculate and Update Extents parameter instead.
To extract minimum and maximum values on attributes, use the StatisticsCalculator.

Creating Boxes and Rectangles

Creating rectangular geometry is a common task. These transformers do so in a variety of ways.

Transformer	Function
Creator	Creates one or more new features with box geometry of a specific size and position (when Geometry Object is Box).
2DBoxReplacer	Replaces an existing feature’s geometry with a box of a specific size and position.
BoundingBoxAccumulator	Creates one rectangle that encompasses all features received.
BoundingBoxReplacer	Individually replaces the geometry of each feature with a rectangle that covers its extents.
RasterExtentsCoercer	Individually replaces the geometry of each raster feature with a rectangle that covers its extents (with various Extents Type options).
BoundsExtractor	Extracts the coordinate values that describe an individual feature’s bounding box (or cube) and stores them as attributes.
2DGridAccumulator	Creates a series of regularly-spaced rectangles that span the extent of all features received (when Type of Grid to Create is Polygons).
2DGridCreator	Creates a series of regularly-spaced rectangles of a specific size and position (when Type of Grid to Create is Polygons).
Tiler and RasterTiler	Do not create actual rectangles, but chop features into a series of rectangular tiles, specified in a similar fashion to the 2DGridAccumulator.

Configuration

Input Ports

Output Ports

Parameters

Output Attribute Names

Minimum X	Name the attribute to contain the minimum x value.
Maximum X	Name the attribute to contain the maximum x value.
Minimum Y	Name the attribute to contain the minimum y value.
Maximum Y	Name the attribute to contain the maximum y value.
Minimum Z	Name the attribute to contain the minimum z value.
Maximum Z	Name the attribute to contain the maximum z value.

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.

How to Set Parameter Values

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.

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.

Arithmetic Editor

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.

Content Types

String Functions	These functions manipulate and format strings.
Special Characters	A set of control characters is available in the Text Editor.
Math Functions	Math functions are available in both editors.
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 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.

Table Tools

Row Reordering

Enabled once you have clicked on a row item. Choices include:

Add a row
Remove a row
Move current row up one
Move current row down one
Move current row to top
Move current row to bottom

Cut, Copy, and Paste

Enabled once you have clicked on a row item. Choices include:

Cut a row - delete and copy to clipboard
Copy a row to the clipboard
Paste a row from the clipboard

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.

Reference

Processing Behavior	Feature-Based
Feature Holding	No
Dependencies	None
Aliases
History

FME Community

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.

Search for all results about the BoundsExtractor on the FME Community.

Examples may contain information licensed under the Open Government Licence – Vancouver and/or the Open Government Licence – Canada.