/ (Division) (arcpy.sa)

サマリ

Divides the values of two rasters on a cell-by-cell basis.

Divide illustration
OutRas = Raster("InRas1") / Raster("InRas2")

説明

ラスタ入力で演算子を使用すると、結果はラスタになります。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。

この演算子では、入力の順序が結果に影響します。

When a number is divided by zero, the output result is NoData.

If both inputs are integers, the divide operator performs an integer division, and the output contains integer values. For example, if 3 is divided by 2, the output is 1.

If either input is of floating-point type, the divide operator performs a floating-point division, and the output contains floating-point values. For example, if 3 is divided by 2.0, the output is 1.5.

Another way to perform the divide 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 whose values will be divided 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 divided by the scalar value.

Raster Layer | Constant
in_raster_or_constant2

The input whose values the first input are to be divided by.

If the first input is a scalar and the second is a raster, an output raster is created with each input raster value being divided into the scalar value.

Raster Layer | Constant

戻り値

名前説明データ タイプ
out_raster

出力ラスタ オブジェクト。

The cell values are the quotient of the first input raster (dividend) divided by the second input (divisor).

Raster

コードのサンプル

/ (Division) example 1 (Python window)

This sample divides the values of the first input raster by the second.

import arcpy
from arcpy import env
from arcpy.sa import *
env.workspace = "C:/sapyexamples/data"
outDivide = Raster("degs") / Raster("negs")
outDivide.save("C:/sapyexamples/output/outdivide")
/ (Division) example 2 (stand-alone script)

This sample divides the values of the first input raster by the second.

# Name: Op_Divide_Ex_02.py
# Description: Divides the values of two rasters on a cell-by-cell basis
# 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
inRaster01 = Raster("elevation")
inRaster02 = Raster("landuse")

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

# Execute Divide
outDivide = inRaster01 / inRaster02

# Save the output 
outDivide.save("C:/sapyexamples/output/outdivide2")

環境

関連トピック

9/14/2013