Extracts the minimum and maximum band values, palette keys, and palette values from a raster feature, and adds them to a list attribute.

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Typical Uses

  • Determining minimum and maximum values for use in expressions or further processing
  • Examining value ranges prior to converting to a different interpretation type

How does it work?

The RasterBandMinMaxExtractor receives raster features, and extracts each raster’s minimum and maximum band values.

If the raster has palettes, the palette key and palette values are also determined. The minimum and maximum palette values are determined from the maximum possible extent of palette values, regardless of whether all values are used in the raster data itself. String palettes are evaluated alphanumerically.

The values are added to list attributes on the output raster feature. Possible list attributes include:

Minimum Band Value _band{}.min
Maximum Band Value _band{}.max
Minimum Palette Key _band{}.palette{}.keyMin
Maximum Palette Key _band{}.palette{}.keyMax
Minimum Palette Value _band{}.palette{}.valueMin
Maximum Palette Value _band{}.palette{}.valueMax

Any Nodata values that are present on the band are ignored in the minimum and maximum value calculations.

This transformer is unaffected by raster band and palette selection.


Usage Notes

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


This transformer has no parameters.

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.