Available with Spatial Analyst license.
Summary
Performs a Relational less-than operation on two inputs on a cell-by-cell basis.
Returns 1 for cells where the first raster is less than the second raster and 0 if it is not.
Illustration
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).
See Analysis environments and Spatial Analyst for additional details on the geoprocessing environments that apply to this tool.
Syntax
LessThan (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 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. 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
LessThan example 1 (Python window)
This example performs a Relational less-than operation on two Grid rasters and outputs the result as a TIFF raster.
import arcpy
from arcpy import env
from arcpy.sa import *
env.workspace = "C:/sapyexamples/data"
outLessThan = LessThan("degs", "negs")
outLessThan.save("C:/sapyexamples/output/outlt.tif")
LessThan example 2 (stand-alone script)
This example performs a Relational less-than operation on two Grid rasters.
# Name: LessThan_Ex_02.py
# Description: Performs a relational less-than operation on two inputs
# on a cell-by-cell basis within the Analysis window
# 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
inRaster1 = "degs"
inRaster2 = "negs"
# Check out the ArcGIS Spatial Analyst extension license
arcpy.CheckOutExtension("Spatial")
# Execute LessThan
outLessThan = LessThan(inRaster1, inRaster2)
# Save the output
outLessThan.save("C:/sapyexamples/output/outlt")
Environments
Licensing Information
- ArcGIS for Desktop Basic: Requires Spatial Analyst
- ArcGIS for Desktop Standard: Requires Spatial Analyst
- ArcGIS for Desktop Advanced: Requires Spatial Analyst