Available with Spatial Analyst license.
Summary
Changes the sign (multiplies by -1) of the cell values of the input raster on a cell-by-cell basis.
Illustration
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)
| Parameter | Explanation | Data 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
| Name | Explanation | Data 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"
# Check out the ArcGIS Spatial Analyst extension license
arcpy.CheckOutExtension("Spatial")
# Execute Negate
outNegate = Negate(inRaster)
# Save the output
outNegate.save("C:/sapyexamples/output/outnegate")
Environments
Licensing information
- ArcGIS Desktop Basic: Requires Spatial Analyst
- ArcGIS Desktop Standard: Requires Spatial Analyst
- ArcGIS Desktop Advanced: Requires Spatial Analyst