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Negate

Available with Spatial Analyst license.

Available with Image Analyst license.

Summary

Changes the sign (multiplies by -1) of the cell values of the input raster on a cell-by-cell basis.

Illustration

Negate illustration
OutRas = Negate(InRas1)

Usage

  • If the input is integer, the output raster will be integer type. If the input is floating point, the output raster will be floating point.

  • 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

Negate (in_raster_or_constant)
ParameterExplanationData Type
in_raster_or_constant

The input raster to be negated (multiplied by -1).

In order to use a number as an input for this parameter, 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 input values negated (multiplied by -1).

Raster

Code sample

Negate example 1 (Python window)

This example changes the sign of the values in the input raster and outputs a Grid raster.

import arcpy
from arcpy import env
from arcpy.sa import *
env.workspace = "C:/sapyexamples/data"
outNegate = Negate("degs")
outNegate.save("C:/sapyexamples/output/outneg")
Negate example 2 (stand-alone script)

This example changes the sign of the values in the input raster and outputs a Grid raster.

# Name: Negate_Ex_02.py
# Description: Changes the sign (multiplies by -1) of the cell values
#              of the 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
inRaster = "degs"

# Execute Negate
outNegate = Negate(inRaster)

# Save the output 
outNegate.save("C:/sapyexamples/output/outnegate")

Licensing information

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

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