Less Than Equal (Spatial Analyst)

Summary

Performs a Relational less-than-or-equal-to operation on two inputs on a cell-by-cell basis.

Returns 1 for cells where the first raster is less than or equal to the second raster and 0 where it is not.

Learn more about how the Relational Math tools work

Illustration

OutRas = LessThanEqual(InRas1, 2)

Usage

• Two inputs are necessary for this relational evaluation to take place.

• The order of inputs is relevant for this tool.

• In Map Algebra, the equivalent operator symbol for this tool is "<=" (link).

Syntax

LessThanEqual (in_raster_or_constant1, in_raster_or_constant2)

Parameter	Explanation	Data Type
in_raster_or_constant1	The input being tested to determine if it is less than or equal to the second input. A number can be used as an input for this parameter, provided a raster is specified for the other parameter. To be able 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 against which the first input is tested to be less than or equal to. A number can be used as an input for this parameter, provided a raster is specified for the other parameter. To be able 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 output cell values will be either integer 0 or 1; or NoData if any input cell value is NoData.	Raster

Code Sample

LessThanEqual example 1 (Python window)

This example performs a Relational less-than-or-equal-to operation on two GRID rasters and outputs the result as an IMG raster.

import arcpy
from arcpy import env
from arcpy.sa import *
env.workspace = "C:/sapyexamples/data"
outLTE = LessThanEqual("degs", "negs")
outLTE.save("C:/sapyexamples/output/outlte.img")

LessThanEqual example 2 (stand-alone script)

This example performs a Relational less-than-or-equal-to operation on two GRID rasters.

# Name: LessThanEqual_Ex_02.py
# Description: Performs a relational less-than-equal operation on two
#              inputs on a cell-by-cell basis
# 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
inRaster1 = "degs"
inRaster2 = "negs"

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

# Execute LessThanEqual
outLTE = LessThanEqual(inRaster1, inRaster2)

# Save the output 
outLTE.save("C:/sapyexamples/output/outlte")

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