Bitwise Or (Spatial Analyst)

Available with Spatial Analyst license.

Available with Image Analyst license.

Summary

Performs a Bitwise Or operation on the binary values of two input rasters.

Learn more about how Bitwise Math tools work

Illustration

OutRas = BitwiseOr(InRas1, InRas2)

Usage

• Two inputs are necessary for this bitwise operation to take place.

• The order of inputs is irrelevant for this tool.

• If an input is floating point, the values are converted to integer values through truncation before the bitwise operation is performed.

• In bitwise operations, the following are true:

  • Binary values are stored in two's complement.
  • The tools work on 32-bit integers.
  • The leftmost bit position is reserved for the sign (positive or negative) of the value. If the integer is positive, the bit position is 0; if it's negative, the bit position is 1.

• The Bitwise Or operation treats the sign bit as it would any other bit. If one or both inputs for a cell location are negative, the output is negative; if both inputs are positive, the output is positive.

• If both inputs are single-band rasters or one of the inputs is a constant, the output will be a single-band raster.

• If both inputs are multiband rasters, the tool will perform the operation on each band from one input, and the output will be a multiband raster. The number of bands in each multiband input must be the same.

• If one of the inputs is a multiband raster and the other input is a constant, the tool will perform the operation using the constant value for each band in the multiband input, and the output will be a multiband raster.

• If both inputs are multidimensional raster data with the same number of variables, the tool will perform the operation for all slices with the same dimension value. The output will be a multidimensional raster in CRF format. The variables in the inputs must have at least one common dimension and one common dimensional value for this tool to process; otherwise, an error will occur.

  If both inputs have one variable but different names, uncheck the Match Multidimensional Variable geoprocessing environment (set arcpy.env.matchMultidimensionalVariable = False in Python) before running the tool.

  If one of the inputs is a multidimensional raster and the other input is a constant, the tool will perform the operation for all slices for all variables using the constant value, and the output will be a multidimensional raster.

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

Parameters

Dialog

Label	Explanation	Data Type
Input raster or constant value 1	The first input to use in this bitwise operation. A number can be used as an input for this parameter, provided a raster is specified for the other parameter. To specify a number for both inputs, the cell size and extent must first be set in the environment.	Raster Layer; Constant
Input raster or constant value 2	The second input to use in this bitwise operation. A number can be used as an input for this parameter, provided a raster is specified for the other parameter. To specify a number for both inputs, the cell size and extent must first be set in the environment.	Raster Layer; Constant

Return Value

Label	Explanation	Data Type
Output raster	The output raster. The cell values are the result of a Bitwise Or operation on the two inputs.	Raster

Python

BitwiseOr(in_raster_or_constant1, in_raster_or_constant2)

Name	Explanation	Data Type
in_raster_or_constant1	The first input to use in this bitwise operation. A number can be used as an input for this parameter, provided a raster is specified for the other parameter. 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 second input to use in this bitwise operation. A number can be used as an input for this parameter, provided a raster is specified for the other parameter. 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 cell values are the result of a Bitwise Or operation on the two inputs.	Raster

Code sample

BitwiseOr example 1 (Python window)

This example performs a Bitwise Or operation on two Grid rasters.

import arcpy
from arcpy import env
from arcpy.sa import *
env.workspace = "C:/sapyexamples/data"
outBitwiseOr = BitwiseOr("degs", "negs")
outBitwiseOr.save("C:/sapyexamples/output/outbitor")

BitwiseOr example 2 (stand-alone script)

This example performs a Bitwise Or operation on two Grid rasters and outputs the result as a TIFF.

# Name: BitwiseOr_Ex_02.py
# Description: Performs a Bitwise Or operation on the binary values
#              of two input rasters
# 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"

# Execute BitwiseOr
outBitwiseOr = BitwiseOr(inRaster1, inRaster2)

# Save the output 
outBitwiseOr.save("C:/sapyexamples/output/outbitwiseor.tif")

Environments

Auto Commit, Cell Size, Cell Size Projection Method, Compression, Current Workspace, Extent, Geographic Transformations, Mask, Output CONFIG Keyword, Output Coordinate System, Scratch Workspace, Snap Raster, Tile Size