Performs basic arithmetic operations on the cell values of a raster against a numeric value.

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Typical Uses

  • Recalculating raster cell values by processing them individually against a numeric value

How does it work?

The RasterSingularCellValueCalculator receives raster features, and evaluates a defined arithmetic expression on the band value(s) of each cell.

The expression is composed of the cell value, an Operation, and a single numeric value (which may also be an attribute or expression). Available operations are addition, subtraction, multiplication, and division.

Particularly useful for operations where the order matters (subtraction and division), the Operand Order specifies whether the raster value or the numeric value is considered first.

The new values are output on the same band they were calculated from. Preserve Interpretation determines whether or not the band is converted to a different type on output - for example, the division of two integers may produce a floating-point decimal result, converting the output band to interpretation type real64.

This transformer supports raster band selection. The RasterSelector can be used to modify the selection. Palettes are not supported.


Usage Notes

  • This transformer performs calculations between one raster cell and a numeric value (Cell 1 <operator> Numeric Value). To perform calculations between two rasters (Cell 1 <operator> Cell 2), use the RasterCellValueCalculator.
  • For more complex calculations, including multiple operators, consider using the RasterExpressionEvaluator.

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.