Replaces or creates feature geometry with a 2D arc as defined in parameters for center point, radii, angles, and rotation.

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Typical Uses

  • Creating arc geometry from attribute values or user parameters

  • Replacing point geometry with arcs defined by values

How does it work?

The 2DArcReplacer receives features of any kind and replaces their geometry with arcs as defined in parameters.

The parameters describe Arc By Center Point geometry with the following:

  • Center X and Y coordinates

  • Primary and Secondary Radius in ground units

  • Start Angle and Sweep Angle in degrees

  • Rotation in degrees

Values may be entered or provided through attribute values, expressions, or user parameters.

If the Center X and Y coordinates are left blank, the first coordinate of the feature’s existing geometry will be used. If the feature has no geometry, the center is set to 0,0.

For more information on arc geometry and types, see Arc.


Usage Notes

  • If the arc values are unknown and need to be calculated from a line feature, consider using the Curvefitter or ArcEstimator.

  • The Creator can create alternate arc types Arc By Bulge and Arc By 3 Points.

Creating and Modifying Arcs, Circles, and Ellipses

These transformers work with arcs in a variety of ways.


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.