Available with Spatial Analyst license.
Summary
Performs a Relational greater-than operation on two inputs on a cell-by-cell basis.
Returns 1 for cells where the first raster is greater than the second raster and 0 for cells 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
GreaterThan (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 greater 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 greater 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
GreaterThan example 1 (Python window)
This example performs a Relational greater-than 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"
outGreaterThan = GreaterThan("degs", "negs")
outGreaterThan.save("C:/sapyexamples/output/outgt.img")
GreaterThan example 2 (stand-alone script)
This example performs a Relational greater-than operation on two Grid rasters.
# Name: GreaterThan_Ex_02.py
# Description: Performs a relational greater-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 GreaterThan
outGreaterThan = GreaterThan(inRaster1, inRaster2)
# Save the output
outGreaterThan.save("C:/sapyexamples/output/outgt")
Environments
Licensing information
- ArcGIS Desktop Basic: Requires Spatial Analyst
- ArcGIS Desktop Standard: Requires Spatial Analyst
- ArcGIS Desktop Advanced: Requires Spatial Analyst