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Minus

Available with Spatial Analyst license.

Available with Image Analyst license.

Available with 3D Analyst license.

Summary

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

Illustration

Minus illustration
OutRas = Minus (InRas1, InRas2)

Usage

  • The order of inputs is relevant for this tool.

  • If both inputs are integer, the output will be an integer raster; otherwise, it will be a floating-point raster.

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

  • See Analysis environments and Spatial Analyst for additional details on the geoprocessing environments that apply to this tool.

Syntax

Minus (in_raster_or_constant1, in_raster_or_constant2)
ParameterExplanationData Type
in_raster_or_constant1

The input from which to subtract the values in 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 values to subtract from the values in the first 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

Return Value

NameExplanationData Type
out_raster

The output raster.

The cell values are the result of subtracting the second input from the first.

Raster

Code sample

Minus example 1 (Python window)

This example 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 = Minus("degs", "negs")
outMinus.save("C:/sapyexamples/output/outminus")
Minus example 2 (stand-alone script)

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

# Name: 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 = "degs"
inRaster2 = "negs"

# Execute Minus
outMinus = Minus(inRaster1, inRaster2)

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

Licensing information

  • ArcGIS Desktop Basic: Requires Spatial Analyst or Image Analyst or 3D Analyst
  • ArcGIS Desktop Standard: Requires Spatial Analyst or Image Analyst or 3D Analyst
  • ArcGIS Desktop Advanced: Requires Spatial Analyst or Image Analyst or 3D Analyst

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