Clips raster features using pixel bounds instead of ground coordinates, and optionally adds cells around the perimeter.

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Typical Uses

  • Clipping a portion of a raster based on number of pixels instead of ground coordinates
  • Adding a frame of empty cells around a raster or subset of a raster

How does it work?

The RasterSubsetter accepts raster features, and clips them according to the origin and number of pixels defined.

The subset is defined by a starting column and row, and the number of columns and rows (that is, cells) to be included.

The starting column and row position are offset from the raster origin (0,0), in the upper left corner of the raster. For more information on raster structure, see Raster.

The clipped raster (subset) may be padded with empty cells, with settings available for top, bottom, left and right.

This transformer is unaffected by raster band and palette selection.


Usage Notes

  • To superset a raster, set the Subset to include the entire raster and add Padding.
  • To clip a raster by spatial extents, use the Clipper.

Choosing a Raster Transformer

FME has an extensive selection of transformers for working with raster data. They can be generally categorized as working with whole rasters, bands, cells or palettes, and those designed for workflow control or combining raster with vector data.

For information on raster geometry and properties, see Rasters (IFMERaster).


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

FME Community

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