Rounds off raster cell values.

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Typical Uses

  • Rounding cell values to a fixed number of decimal places
  • Creating value ranges by rounding to powers of 10.

How does it work?

The RasterCellValueRounder receives raster features. All values on all bands are rounded according to the parameter selections.

Values may be rounded up, down, or to the nearest value, and are calculated to the specified number of decimal places. Negative decimal places may be used to round values to powers of ten - for example, -1 rounds to multiples of 10, -2 rounds to multiples of 100, and so on.

This transformer supports raster band selection. The RasterSelector can be used to modify selection.

Palettes are not supported.


Usage Notes

  • If applying rounding to floating-point (decimal) values that are stored as real32, consider coercing the raster or band to interpretation type real64 prior to using this transformer to avoid unexpected results. The RasterInterpretationCoercer or RasterBandInterpretationCoercer may be used to do this.
    FME’s internal calculations are performed in real64, which is considerably more precise than real32. By converting to real64 prior to using the transformer, the calculation result will not be converted twice (once to real64 for calculations, then again back to less-precise real32 for output), where error may be introduced. Values will be output as real64.

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

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