Extracts the x, y, and z coordinate values of a calculated point in the center of a feature, and adds them as attributes.

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Typical Uses

  • Identifying the center of mass of a feature

  • Identifying the center of the bounding box of a feature

  • Identifying locations for annotation

How does it work?

The CenterPointExtractor receives features with any type of geometry and calculates a center point for each feature, according to a choice of Point Extraction Mode. The calculated coordinates are added to the feature as attribute values. Both 2D and 3D geometry are supported.

Aggregates are also supported, with one center point extracted for each aggregate.

Point Extraction Modes include:

Center of Bounding Box

Extracts the point that is in the center of the feature's bounding box.

Depending on the feature’s shape, the resulting point may fall outside of the original feature.

Center of Gravity

Extracts the point at the feature's center of mass.

Depending on the feature’s shape, the resulting point may fall outside of the original feature.

Any Inside Point

Extracts a point that is guaranteed to fall within the feature.


Usage Notes

  • This transformer does not alter geometry. To replace a feature with its center point, use a CenterPointReplacer.


Input Ports

Output Port


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.

Dialog Options - Tables

Transformers with table-style parameters have additional tools for populating and manipulating values.


Processing Behavior


Feature Holding


Dependencies None
Aliases InsidePointExtractor

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