- (Subtract) operator

Spatial Analyst のライセンスで利用可能。

Image Analyst ライセンスで利用できます。

概要

Subtracts the value of the second input raster from the value of the first input raster on a cell-by-cell basis.

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。

この演算子では、入力の順序が結果に影響します。

Another way to perform the subtraction operator 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 from which to subtract the values in 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 subtracted by the scalar value. Raster Layer | Constant in_raster_or_constant2 The input values to subtract from the values in the first input.If the first input is a scalar and the second is a raster, an output raster is created with each input raster value being subtracted from the scalar value. Raster Layer | Constant

戻り値

 名前 説明 データ タイプ out_raster 出力ラスター オブジェクト。The cell values are the result of subtracting the second input from the first. Raster

コードのサンプル

- (Subtraction) example 1 (Python window)

This sample subtracts the values of the second input raster from the first.

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

This sample subtracts the values of the second input raster from the first.

``````# Name: Op_Minus_Ex_02.py
# Description: Subtracts the value of the second input raster from the
#              value of the first input raster 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
inRaster1 = Raster("degs")
inRaster2 = Raster("negs")

# Execute Minus
outMinus = inRaster1 - inRaster2

# Save the output
outMinus.save("C:/sapyexamples/output/outminus.tif")``````