Expand (Spatial Analyst)

Summary

Expands specified zones of a raster by a specified number of cells.

Learn more about how Expand works

Illustration

Expand illustration
OutRas = Expand(InRas1, 1, [5])

Usage

Syntax

Expand (in_raster, number_cells, zone_values)
ParameterExplanationData Type
in_raster

The input raster for which the identified zones are to be expanded

It must be of integer type.

Raster Layer
number_cells

The number of cells to expand each specified zone by.

The value must be an integer greater than 1.

Long
zone_values
[zone_value,...]

The list of zone values to expand.

The zone values must be integers. They can be in any order.

Long

Return Value

NameExplanationData Type
out_raster

The output generalized raster.

The specified zones of the input raster will be expanded by the specified number of cells.

Raster

Code Sample

Expand example 1 (Python window)

This example expands the zone specified by a list of values by two cells.

import arcpy
from arcpy import env
from arcpy.sa import *
env.workspace = "C:/sapyexamples/data"
outExpand = Expand("filter", 2, [0, 6, -3])
outExpand.save("C:/sapyexamples/output/outexpand.img")
Expand example 2 (stand-alone script)

This example expands the zone specified by a list of values by two cells.

# Name: Expand_Ex_02.py
# Description: Expands specified zones of a raster 
#              by a specified number of cells.
# Requirements: Spatial Analyst Extension
# Author: ESRI

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

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

# Set local variables
inRaster = "filter"
numberCells = 2
zoneValues = [0, 6, -3]

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

# Execute Expand
outExpand = Expand(inRaster, numberCells, zoneValues)

# Save the output 
outExpand.save("C:/sapyexamples/output/outexpand")

Environments

Related Topics

Licensing Information

ArcView: Requires Spatial Analyst
ArcEditor: Requires Spatial Analyst
ArcInfo: Requires Spatial Analyst

6/29/2011