Available with Spatial Analyst license.
Available with Image Analyst license.
Available with 3D 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.
If both inputs are single band rasters, or one of the inputs is a constant, the output will be a single band raster.
If both inputs are multiband rasters, or one of the inputs is a constant, the output will be a multiband raster. The number of bands in each multiband input must be the same.
The tool will perform the operation on each band from one input against the corresponding band from the other input. If one of the inputs is a multiband raster and the other input is a constant, the tool will perform the operation against the constant value for each band in the multiband input.
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 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 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
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")
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"
# Execute Plus
outPlus = Plus(inRaster1, inRaster2)
# Save the output
outPlus.save("C:/sapyexamples/output/outplus")
Environments
Licensing information
- Basic: Requires Spatial Analyst or Image Analyst or 3D Analyst
- Standard: Requires Spatial Analyst or Image Analyst or 3D Analyst
- Advanced: Requires Spatial Analyst or Image Analyst or 3D Analyst