Spatial Analyst のライセンスで利用可能。
概要
Raises the cell values in a raster to the power of the values found in another raster.
図
ディスカッション
ラスター入力で演算子を使用すると、結果はラスターになります。ただし、すべての入力値が数字の場合、結果は数字になります。
複数の演算子が式に使用されている場合、それらは必ずしも左から右へという順に実行されるわけではありません。優先順位値が最も高い演算子が最初に実行されます。演算子の優先順位に関する詳細については、「演算子の優先順位のテーブル」をご参照ください。実行順序の制御には、括弧が使用できます。
Output values are always floating point, regardless of the input value type.
Another way to perform the power operation is a **= b, which is an alternative way to write a = a ** b.
構文
in_raster_or_constant1 ** in_raster_or_constant2
| オペランド | 説明 | データ タイプ |
in_raster_or_constant1 | The input values to be raised to the power defined by the second input. If the first input is a raster and the second is a scalar, an output raster is created with each input raster value being raised to the power of the scalar value. | Raster Layer | Constant |
in_raster_or_constant2 | The input that determines the power to which the values in the first input will be raised. If the first input is a scalar and the second is a raster, an output raster is created with the scalar value being raised to the power of each input raster value. | Raster Layer | Constant |
戻り値
| 名前 | 説明 | データ タイプ |
| out_raster | 出力ラスター オブジェクト。 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 |
コードのサンプル
** (Power) example 1 (Python window)
This sample uses the values in the second input raster as the power by which to raise the values in the first input raster.
import arcpy
from arcpy import env
from arcpy.sa import *
env.workspace = "C:/sapyexamples/data"
outPower = Raster("degs") ** Raster("cost")
outPower.save("C:/sapyexamples/output/outpower.img")
** (Power) example 2 (stand-alone script)
This sample uses the values in the second input raster as the power by which to raise the values in the first input raster.
# Name: Op_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
# 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 = Raster("degs")
inRaster2 = Raster("cost")
# Check out the ArcGIS Spatial Analyst extension license
arcpy.CheckOutExtension("Spatial")
# Execute Power
outPower = inRaster1 ** inRaster2
# Save the output
outPower.save("C:/sapyexamples/output/outpower")