Over (Spatial Analyst)

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

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.

Syntax

Over (in_raster_or_constant1, in_raster_or_constant2)

Parameter	Explanation	Data 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

Name	Explanation	Data 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
# 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 Over
outOver = Over(inRaster1, inRaster2)

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

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