Available with Spatial Analyst license.
Summary
Adds (sums) the values of two rasters on a cell-by-cell basis.
Illustration
Usage
The order of inputs is irrelevant 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
Plus (in_raster_or_constant1, in_raster_or_constant2)
| Parameter | Explanation | Data Type |
in_raster_or_constant1 | The input whose values will be added to. 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 whose values will be added to 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
| Name | Explanation | Data Type |
| out_raster | The output raster. The cell values are the sum of the first input added to the second. | Raster |
Code sample
Plus example 1 (Python window)
This example adds the values of two Grid rasters and outputs the result as an IMG raster.
import arcpy
from arcpy import env
from arcpy.sa import *
env.workspace = "C:/sapyexamples/data"
outPlus = Plus("degs", "negs")
outPlus.save("C:/sapyexamples/output/outplus.img")
Plus example 2 (stand-alone script)
This example adds the values of two Grid rasters and outputs the result as a Grid raster.
# Name: Plus_Ex_02.py
# Description: Adds the values of two rasters 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 = "cost"
inRaster2 = "degs"
# Check out the ArcGIS Spatial Analyst extension license
arcpy.CheckOutExtension("Spatial")
# Execute Plus
outPlus = Plus(inRaster1, inRaster2)
# Save the output
outPlus.save("C:/sapyexamples/output/outplus")
Environments
Licensing information
- ArcGIS Desktop Basic: Requires Spatial Analyst or 3D Analyst
- ArcGIS Desktop Standard: Requires Spatial Analyst or 3D Analyst
- ArcGIS Desktop Advanced: Requires Spatial Analyst or 3D Analyst