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Examples of Logarithmic tool output on floating-point input

Available with Spatial Analyst license.

Available with Image Analyst license.

The Logarithmic math tools can process both integer and floating-point input values. However, note that input values that are 0 or negative will be NoData in the output raster.

The following illustrations demonstrate the output values from both positive and negative floating-point inputs, as well as inputs of value 0.

Logarithmic tools on float input

ToolIllustration and Python syntax
Ln
Ln illustration on float input)
OutRas = Ln(InRas1)
Log10
Log10 illustration on float input)
OutRas = Log10(InRas1)
Log2
Log2 illustration on float input)
OutRas = Log2(InRas1)

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