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Create Constant Raster

Available with Spatial Analyst license.

Summary

Creates a raster of a constant value within the extent and cell size of the analysis window.

Illustration

Create Constant raster illustration
OutRas = CreateConstantRaster(2)

Usage

  • The Create Constant Raster tool assigns the specified value to every cell in the output raster.

  • The constant value must be a numeric value. Scientific notation is acceptable (for example, 3.048e-4 for 0.003048).

  • See Analysis environments and Spatial Analyst for additional details on the geoprocessing environments that apply to this tool.

Syntax

CreateConstantRaster (constant_value, {data_type}, {cell_size}, {extent})
ParameterExplanationData Type
constant_value

The constant value with which to populate all the cells in the output raster.

Double
data_type
(Optional)

Data type of the output raster dataset.

  • INTEGER An integer raster will be created.
  • FLOAT A floating-point raster will be created.

If the specified data type is Float, the values of the cells in the output raster will only be accurate to the constant value of 7 decimal places, regardless of the output format.

String
cell_size
(Optional)

The cell size for the output raster dataset.

This is the value in the environment if specifically set. If not specifically set, it is the shorter of the width or height of the environment extent in the output spatial reference, divided by 250.

Analysis Cell Size
extent
(Optional)

The extent for the output raster dataset.

The Extent is a Python class.

In this tool, it is in the form of Extent(XMin, YMin, XMax, YMax)

  • where XMin and YMin define the lower left coordinate of the extent, with XMax and YMax defining the upper right coordinate.

The coordinates are specified in the same map units as the Output coordinate system environment setting.

The extent will be the value in the environment if specifically set. If not specifically set, the default is 0, 0, 250, 250.

Extent

Return Value

NameExplanationData Type
out_raster

The output raster for which each cell will have the specified constant value.

Raster

Code sample

CreateConstantRaster example 1 (Python window)

This sample creates a float raster of a particular value at the defined cell size and extent.

import arcpy
from arcpy import env
from arcpy.sa import *
env.workspace = "C:/sapyexamples/data"
outConstRaster = CreateConstantRaster(12.7, "FLOAT", 2, Extent(0, 0, 250, 250))
outConstRaster.save("C:/sapyexamples/output/outconst2")
CreateConstantRaster example 2 (stand-alone script)

This sample creates an integer raster of a particular value at the defined cell size and extent.

# Name: CreateConstantRaster_Ex_02.py
# Description: Creates a raster from a constant value
# Requirements: Spatial Analyst Extension

# Import system modules
import arcpy
from arcpy.sa import *

# Set local variables
constantValue = 12
cellSize = 2
outExtent = Extent(0, 0, 250, 250)

# Execute CreateConstantRaster
outConstRaster = CreateConstantRaster(constantValue, "FLOAT", cellSize,
                                      outExtent)

# Save the output 
outConstRaster.save("C:/sapyexamples/output/outconst")

Licensing information

  • ArcGIS Desktop Basic: Requires Spatial Analyst
  • ArcGIS Desktop Standard: Requires Spatial Analyst
  • ArcGIS Desktop Advanced: Requires Spatial Analyst

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