ArcMap

Over

Available with Spatial Analyst license.

Summary

For the cell values in the first input that are not 0, the output value will be that of the first input. Where the cell values are 0, the output will be that of the second input raster.

Illustration

Over illustration
OutRas = Over(InRas1, InRas2)

Usage

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

  • The order of inputs is relevant for this tool.

  • If both inputs are integer, the output will be an integer raster; otherwise, it will be a floating-point raster.

  • See Analysis environments and Spatial Analyst for additional details on the geoprocessing environments that apply to this tool.

Syntax

Over (in_raster_or_constant1, in_raster_or_constant2)
ParameterExplanationData Type
in_raster_or_constant1

The input for which cell values of 0 will be replaced with the value from 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 whose value will be assigned to the output raster cells where the first input value is 0.

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

NameExplanationData Type
out_raster

The output raster.

Raster

Code sample

Over example 1 (Python window)

This example performs an Over operation on two Grid rasters.

import arcpy
from arcpy import env
from arcpy.sa import *
env.workspace = "C:/sapyexamples/data"
outOver = Over("degs", "negs")
outOver.save("C:/sapyexamples/output/outover2")
Over example 2 (stand-alone script)

This example performs an Over operation on two Grid rasters.

# Name: Over_Ex_02.py
# Description: Returns those values from the first input that are
#    non-zero; otherwise, returns the value from the second input
# 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 Over
outOver = Over(inRaster1, inRaster2)

# Save the output 
outOver.save("C:/sapyexamples/output/outover")

Environments

Licensing information

  • ArcGIS Desktop Basic: Requires Spatial Analyst
  • ArcGIS Desktop Standard: Requires Spatial Analyst
  • ArcGIS Desktop Advanced: Requires Spatial Analyst

Related topics