/ (Division) (arcpy.sa)
Summary
Divides the values of two rasters on a cell-by-cell basis.
Illustration
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OutRas = Raster("InRas1") / Raster("InRas2") |
Discussion
When using an operator with a raster input the result will be a raster. However, if all inputs are numbers, then the result is a number.
When multiple operators are used in an expression, they are not necessarily executed in left-to-right order. The operator with the highest precedence value will be executed first. For more information on operator precedence, see operator precedence table. You can use parentheses to control the execution order.
The order of input is relevant for this operator.
When a number is divided by zero, the output result is NoData.
If both inputs are integers, the divide operator performs an integer division, and the output contains integer values. For example, if 3 is divided by 2, the output is 1.
If either input is of floating-point type, the divide operator performs a floating-point division, and the output contains floating-point values. For example, if 3 is divided by 2.0, the output is 1.5.
Another way to perform the divide operation is a /= b which is an alternative way to write a = a / b.
Syntax
| Operand | Explanation | Data Type |
in_raster_or_constant1 |
The input whose values will be divided by the second input. If the first input is a raster and the second is a scalar, an output raster is created with each input raster value being divided by the scalar value. | Raster Layer | Constant |
in_raster_or_constant2 |
The input whose values the first input are to be divided by. If the first input is a scalar and the second is a raster, an output raster is created with each input raster value being divided into the scalar value. | Raster Layer | Constant |
Return Value
| Name | Explanation | Data Type |
| out_raster |
The output raster object. The cell values are the quotient of the first input raster (dividend) divided by the second input (divisor). | Raster |
Code Sample
This sample 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 = Raster("degs") / Raster("negs")
outDivide.save("C:/sapyexamples/output/outdivide")
This sample divides the values of the first input raster by the second.
# Name: Op_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 = Raster("elevation")
inRaster02 = Raster("landuse")
# Check out the ArcGIS Spatial Analyst extension license
arcpy.CheckOutExtension("Spatial")
# Execute Divide
outDivide = inRaster01 / inRaster02
# Save the output
outDivide.save("C:/sapyexamples/output/outdivide2")