Divide (Image Analyst)

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, the tool will perform the operation on each band from one input, and the output will be a multiband raster. The number of bands in each multiband input must be the same.

• If one of the inputs is a multiband raster and the other input is a constant, the tool will perform the operation using the constant value for each band in the multiband input, and the output will be a multiband raster.

• If both inputs are multidimensional raster data with the same number of variables, the tool will perform the operation for all slices with the same dimension value. The output will be a multidimensional raster in CRF format. The variables in the inputs must have at least one common dimension and one common dimensional value for this tool to process; otherwise, an error will occur.

  If both inputs have one variable but different names, uncheck the Match Multidimensional Variable geoprocessing environment (set arcpy.env.matchMultidimensionalVariable = False in Python) before running the tool.

  If one of the inputs is a multidimensional raster and the other input is a constant, the tool will perform the operation for all slices for all variables using the constant value, and the output will be a multidimensional raster.

• In map algebra, the equivalent operator symbol for this tool is "/" (link).

Parameters

Dialog

Label	Explanation	Data Type
Input raster or constant value 1	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
Input raster or constant value 2	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

Label	Explanation	Data Type
Output raster	The output raster. The cell values are the quotient of the first input raster (dividend) divided by the second input (divisor).	Raster

Python

Divide(in_raster_or_constant1, in_raster_or_constant2)

Name	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.ia import *
env.workspace = "C:/iapyexamples/data"
outDivide = Divide("degs", "negs")
outDivide.save("C:/iapyexamples/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 pixel-by-pixel basis
# Requirements: Image Analyst Extension

# Import system modules
import arcpy
from arcpy import env
from arcpy.ia import *

# Set environment settings
env.workspace = "C:/iapyexamples/data"

# Set local variables
inRaster01 = "elevation"
inRaster02 = "landuse"

# Check out the ArcGIS Image Analyst extension license
arcpy.CheckOutExtension("ImageAnalyst")

# Execute Divide
outDivide = Divide(inRaster01, inRaster02)

# Save the output 
outDivide.save("C:/iapyexamples/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