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Creates a buffer zone of specified size around or inside input geometry.

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Typical Uses

  • Creating fixed size zones around features, such as rights-of-way or setbacks
  • Determining spatial relationships based on proximity
  • Creating variable size zones around features to represent attribute values

How does it work?

The Bufferer accepts 2D point, curve (line), and area geometries when the Buffer Type is Area (2D). All geometry types are accepted when the Buffer Type is Solid.

Point and lines may be expanded, creating surrounding polygons or solids with points offset by the specified Buffer Amount in ground units. Areas may be expanded or shrunk, using positive or negative Buffer Amounts, but solids require positive Buffer Amounts.

The attributes of the original features are retained, and the buffer is output, discarding the original geometry.

A selection of end cap and corner styles is available.

An optional list attribute may be created, holding multiple attributes for grouped or aggregate input.

Usage Notes

  • This transformer creates buffers that are of equal width on either side of a linear input feature. To create offsets to either the left or right-hand side of a feature, use the OffsetCurveGenerator.
  • To buffer features in Geographic (lat/long) coordinates, consider the GeographicBufferer.
  • Areas will be buffered on one side only - externally for a positive Buffer Amount, and internally for a negative Buffer Amount.


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.


Processing Behavior

Dependent on Group By parameter. If:

Feature Holding

Dependent on Group By parameter. If:

  • Group By Unset: No
  • Group By Set: Yes
FME Licensing Level FME Base Edition and above


Spatial Analysis

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Examples may contain information licensed under the Open Government Licence – Vancouver