ACos (Image Analyst)

Available with Spatial Analyst license.

Summary

Calculates the inverse cosine of cells in a raster.

Illustration

ACos illustration
OutRas = ACos(InRas)

Usage

  • In mathematics, all trigonometric functions have a defined range of valid input values called the domain. The output values from each function also have a defined range. For this tool, the following are true:

    • The Domain is: -1 ≤ [in_value] ≤ 1

      Note that any input value that is outside this domain will receive NoData on the output raster.

    • The Range is: 0 ≤ [out_value] ≤ pi

  • The input values to this tool are interpreted as unitless.

  • Output values are always floating point, regardless of the input data type.

  • The output values from this tool are in radians. To use degrees instead, the resulting raster must be multiplied by the radians-to-degrees conversion factor of 180/pi, or approximately 57.296.

    For further assistance, a procedure to follow and examples of converting output in radians to degrees are available.

  • If the input is a multiband raster, the output will be a multiband raster. The tool will perform the operation on each band in the input.

  • If the input is multidimensional raster data, all slices from all variables will be processed. The output will be a multidimensional raster in CRF format.

Parameters

LabelExplanationData Type
Input raster or constant value

The input for which to calculate the inverse cosine values.

To use a number as an input for this parameter, the cell size and extent must first be set in the environment.

Raster Layer; Constant

Return Value

LabelExplanationData Type
Output raster

The output raster.

The values are the inverse cosine of the input values.

Raster

ACos(in_raster_or_constant)
NameExplanationData Type
in_raster_or_constant

The input for which to calculate the inverse cosine values.

To use a number as an input for this parameter, the cell size and extent must first be set in the environment.

Raster Layer; Constant

Return Value

NameExplanationData Type
out_raster

The output raster.

The values are the inverse cosine of the input values.

Raster

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