Extract by Rectangle (Spatial Analyst)

Summary

Extracts the cells of a raster based on a rectangle.

Usage

• The center of the cell is used to determine whether a cell is inside or outside a rectangle. If the center is within the outline of a rectangle, the cell is considered fully inside even if portions of the cell fall outside the rectangle.

• Cell locations that are not selected are assigned a value of NoData.

• When a multiband raster is specified as input, a new multiband raster will be created as output. Each individual band in the input multiband raster will be analyzed accordingly.

  The default output format is an ESRI grid stack. Note that the name of an ESRI grid stack cannot start with a number, use spaces, or be more than 9 characters in length.

• If the input is a layer created from a multiband raster with more than three bands, the extraction operation will only consider the bands that were loaded (symbolized) by the layer. As a result, the output multiband raster can only have three bands, corresponding to those used in the display of the input layer.

• If the input raster is integer, the output raster will be integer. If the input is floating point, the output will be floating point.

Syntax

ExtractByRectangle (in_raster, rectangle, {extraction_area})

Parameter	Explanation	Data Type
in_raster	The input raster from which cells will be extracted.	Raster Layer
rectangle extent	A rectangle that defines the area to be extracted. An Extent object is used to specify the coordinates. The form of the object is: Extent(XMin, YMin, XMax, YMax) where XMin and YMin define the lower-left coordinates of the area to be extracted, and XMax and YMax define the upper-right coordinates. The coordinates are specified in the same map units as the in_raster.	Extent
extraction_area (Optional)	Identifies whether to extract cells inside or outside the input rectangle. INSIDE — A keyword specifying that the cells inside the input rectangle should be selected and written to the output raster. All cells outside the rectangle will receive NoData values on the output raster. OUTSIDE — A keyword specifying that the cells outside the input rectangle should be selected and written to the output raster. All cells inside the rectangle will receive NoData values on the output raster.	String

Return Value

Name	Explanation	Data Type
out_raster	The output raster containing the cell values extracted from the input raster.	Raster

Code Sample

ExtractByRectangle example 1 (Python window)

This example extracts cells outside a rectangular extent to a new raster.

import arcpy
from arcpy import env
from arcpy.sa import *
env.workspace = "C:/sapyexamples/data"
rectExtract = ExtractByRectangle("elevation", 
                                 Extent(477625, 213900, 486400, 224200), 
                                 "OUTSIDE")
rectExtract.save("c:/sapyexamples/output/extrect")

ExtractByRectangle example 2 (stand-alone script)

This example extracts cells inside a rectangular extent to a new raster.

# Name: ExtractByRectangle_Ex_02.py
# Description: 
# 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 = "elevation"
inRectangle = Extent(477625, 213900, 486400, 224200)

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

# Execute ExtractByRectangle
rectExtract = ExtractByRectangle(inRaster, inRectangle, "INSIDE")

# Save the output 
rectExtract.save("c:/sapyexamples/output/extrect02")

Environments

Cell Size, Current Workspace, Mask, Output Coordinate System, Extent, Scratch Workspace, Snap Raster

Licensing Information

ArcView: Requires Spatial Analyst

ArcEditor: Requires Spatial Analyst

ArcInfo: Requires Spatial Analyst