Calculates a circle containing all vertices of the input feature, output as either attribute values or geometry.

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Typical Uses

  • Calculating circular boundaries around features

How does it work?

The MinimumSpanningCircleReplacer receives features with any type of geometry and calculates a 2D circular ellipse that encloses all of the feature’s vertices.

The transformer has two modes:

  • Replace Geometry - replace the input feature geometry with the circle

  • Set Attributes - add the center coordinates and radius as attribute values, keeping the input geometry intact.

One circle is generated for each feature or aggregate.

Features with 3D geometry such as 3D objects and point clouds will have a circle generated that encloses their footprint in 2D.

Point features are passed through unchanged (unless they are aggregated or multi-point).


Usage Notes

  • To generate a circle around multiple features, use an Aggregator before the MinimumSpanningCircleReplacer.


Input Ports

Output Ports


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

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