# HfBinary

Available with Spatial Analyst license.

## Summary

Defines the relationship between the horizontal cost factor and the horizontal relative moving angle through a binary function. If the horizontal relative moving angle is less than the cut angle, the horizontal factor is set to the value associated with the zero factor; otherwise it is infinity.

## Discussion

This object is used in the Distance Accumulation and Distance Allocation Spatial Analyst tools, as well as the Path Distance, Path Distance Allocation, and Path Distance Back Link Legacy Distance tools.

When the horizontal relative moving angle (HRMA) is less than the cut angle, the horizontal factor (HF) for moving through the section of the cell is set to the value associated with the zeroFactor. If the HRMA is greater than the cutAngle, the HF for the section is set to infinity.

## Syntax

`HfBinary ({zeroFactor}, {cutAngle})`
 Parameter Explanation Data Type zeroFactor The zeroFactor will be used to position the y-intercept of the binary function. (The zeroFactor is assigned as the horizontal factor when HRMA is less then the cutAngle.)(The default value is 1.0) Double cutAngle The cutAngle establishes the HRMA degree threshold beyond which the HFs are set to infinity. (When the HRMA is less than the cutAngle the horizontal factor is assigned to the zeroFactor; when the HRMA is greater than the cutAngle the horizontal factor is assigned infinity.)(The default value is 45) Double

## Properties

 Property Explanation Data Type zeroFactor(Read and Write) The zeroFactor will be used to position the y-intercept of the function. The zeroFactor is assigned as the horizontal factor when HRMA is less then the cut angle. Double cutAngle(Read and Write) The cutAngle establishes the HRMA degree threshold beyond which the HFs are set to infinity. When the HRMA is less than the cut angle then the zero factor is assigned and when the HRMA is greater than the cut angle, infinity is assigned. Double

## Code sample

HfBinary example 1 (Python window)

Demonstrates how to create a HfBinary class and use it in the DistanceAccumulation tool within the Python window.

``````import arcpy
from arcpy import env
from arcpy.sa import *
env.workspace = "C:/sapyexamples/data"
myHfBinary = HfBinary(1.5, 45.5)
outDistAccum = DistanceAccumulation("source.shp", "barrier.tif",
"elev.tif", "", "", "",
"horizontalRas.tif", myHfBinary)
outDistAccum.save("C:/sapyexamples/output/distaccumhfb")``````
HfBinary example 2 (stand-alone script)

Performs a DistanceAccumulation analysis using the HfBinary class.

``````# Name: HfBinary_Ex_02.py
# Description: Uses the HFBinary object to run the
#              DistanceAccumulation tool.
# 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
inSourceData = "sourcepts.shp"
inSurfaceRaster = "elevation.tif"
inHorizontalRaster = "horizontalRas.tif"

# Create the HfBinary Object
zeroFactor = 1.0
cutAngle = 45.0
myHorizFactor = HfBinary(zeroFactor, cutAngle)

# Check out the ArcGIS Spatial Analyst extension license
arcpy.CheckOutExtension("Spatial")

# Execute
outDistAccum = DistanceAccumulation(inSourceData,"", inSurfaceRaster,"","",
"", inHorizontalRaster, myHorizFactor)

# Save the output
outDistAccum.save("C:/sapyexamples/output/distaccumhfb2")``````