ArcMap

Minus

Available with Spatial 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"

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

# Execute Minus
outMinus = Minus(inRaster1, inRaster2)

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

Environments

Licensing information

  • Basic: Requires Spatial Analyst
  • Standard: Requires Spatial Analyst
  • Advanced: Requires Spatial Analyst

Related topics