FME Transformers: 2024.1

Categories
Geometries

Geometries

Spatial Analysis

Spatial Analysis

Categories
Geometries

Geometries

Spatial Analysis

Spatial Analysis

CenterPointReplacer

Replaces the geometry of the feature with a point that is either in the center of the feature's bounding box, at the center of mass of the feature, or somewhere guaranteed to be inside the feature's area.

If the Mode is Center Point of Bounding Box or Center of Gravity Point, depending on the feature's shape, the resulting point may be far outside of the original feature.

Example

The following illustration shows the result when the Mode is Center of Gravity Point. The transformer calculates the exact distribution of portions of a shape; therefore, some points can actually appear outside a feature.

Configuration

Output Ports

Points that have replaced the input features.

This port outputs null geometry features, and when Mode is Any Inside Point, all non-area geometry features.

Parameters

Mode

Center Point of Bounding Box: Replaces the geometry of the feature with a point that is in the center of the feature's bounding box. Depending on the feature’s shape, the resulting point may be far outside of the original feature.

Center of Gravity Point: Replaces the geometry of the feature with a point at the center of mass of the feature. Depending on the feature’s shape, the resulting point may be far outside of the original feature.

Any Inside Point: Replaces the geometry of the area feature with a point that is guaranteed to be inside the area.

Editing Transformer Parameters

Transformer parameters can be set by directly entering values, using expressions, or referencing other elements in the workspace such as attribute values or user parameters. Various editors and context menus are available to assist. To see what is available, click beside the applicable parameter.

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.

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.

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.

Table Tools

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:

  • 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.

For more information, see Transformer Parameter Menu Options.

 

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 CenterPointReplacer on the FME Community.

Keywords: MBR "minimum bounding rectangle" CenterPointCreator CentrePointCreator CentrePointReplacer