Divide (Spatial Analyst)

Available with Spatial Analyst license.

Available with Image Analyst license.

Available with 3D Analyst license.

Summary

Divides the values of two rasters on a cell-by-cell basis.

Illustration

OutRas = Divide (InRas1, InRas2)

Usage

• The order of inputs is relevant for this tool.

• When a number is divided by zero, the output result is NoData.

• The data types of the inputs to determine the data type of the output:

  • If both inputs are integers, an integer division is performed, and the output result is an integer. For example, if 3 is divided by 2, the output is 1.
  • If either input is floating-point, a floating-point division is performed, and the output result is a floating-point value. For example, if 3 is divided by 2.0, the output is 1.5.

• 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

Divide(in_raster_or_constant1, in_raster_or_constant2)

Parameter	Explanation	Data Type
in_raster_or_constant1	The input whose values will be divided by the second 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
in_raster_or_constant2	The input whose values the first input are to be divided by. 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 quotient of the first input raster (dividend) divided by the second input (divisor).	Raster

Code sample

Divide example 1 (Python window)

This example divides the values of the first input raster by the second.

import arcpy
from arcpy import env
from arcpy.sa import *
env.workspace = "C:/sapyexamples/data"
outDivide = Divide("degs", "negs")
outDivide.save("C:/sapyexamples/output/outdivide2")

Divide example 2 (stand-alone script)

This example divides the values of the first input raster by the second.

# Name: Divide_Ex_02.py
# Description: Divides 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
inRaster01 = "elevation"
inRaster02 = "landuse"

# Execute Divide
outDivide = Divide(inRaster01, inRaster02)

# Save the output 
outDivide.save("C:/sapyexamples/output/outdivide")

Environments

Auto Commit, Cell Size, Cell Size Projection Method, Compression, Current Workspace, Extent, Geographic Transformations, Mask, Output CONFIG Keyword, Output Coordinate System, Scratch Workspace, Snap Raster, Tile Size

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