# Power (Spatial Analyst)

## Summary

Raises the cell values in a raster to the power of the values found in another raster.

## Illustration

 OutRas = Power(InRas1, 2)

## Usage

• The output raster from this tool is always floating point type, regardless of the input value type.

• In Map Algebra, the equivalent operator symbol for this tool is "**" (link).

## Syntax

Power (in_raster_or_constant1, in_raster_or_constant2)
 Parameter Explanation Data Type in_raster_or_constant1 The input values to be raised to the power defined by the second input. A number can be used as an input for this parameter, provided a raster is specified for the other parameter. To be able to specify a number for both inputs, the cell size and extent must first be set in the environment. Raster Layer | Constant in_raster_or_constant2 The input that determines the power the values in the first input will be raised to. A number can be used as an input for this parameter, provided a raster is specified for the other parameter. To be able to specify a number for both inputs, the cell size and extent must first be set in the environment. Raster Layer | Constant

#### Return Value

 Name Explanation Data Type out_raster The output raster.The cell values are the result of raising the values in the first input to the power of the values in the second input. Raster

## Code Sample

Power example 1 (Python window)

This example uses the values in the second input raster as the power to raise the values in the first input raster by, and outputs the result as an IMG raster.

```import arcpy
from arcpy import env
from arcpy.sa import *
env.workspace = "C:/sapyexamples/data"
outPower = Power("degs", "cost")
outPower.save("C:/sapyexamples/output/outpower.img")```
Power example 2 (stand-alone script)

This example uses the values in the second input raster as the power to raise the values in the first input raster by, and outputs the result as an IMG raster.

```# Name: Power_Ex_02.py
# Description: Raises the cells in a raster to the power of the values
#              found in another raster
# Requirements: Spatial Analyst Extension
# Author: ESRI

# Import system modules
import arcpy
from arcpy import env
from arcpy.sa import *

# Set environment settings
env.workspace = "C:/sapyexamples/data"

# Set local variables
inRaster1 = "degs"
inRaster2 = "cost"

# Check out the ArcGIS Spatial Analyst extension license
arcpy.CheckOutExtension("Spatial")

# Execute Power
outPower = Power(inRaster1, inRaster2)

# Save the output
outPower.save("C:/sapyexamples/output/outpower.img")```

## Licensing Information

ArcView: Requires Spatial Analyst
ArcEditor: Requires Spatial Analyst
ArcInfo: Requires Spatial Analyst

6/29/2011