# HfInverseLinear (arcpy.sa)

## 插图

 路径距离功能的 HfInverseLinear 水平系数。

## 讨论

HfInverseLinear 对象用于 Spatial Analyst 工具路径距离路径距离分配路径距离回溯链接

## 语法

HfInverseLinear ({zeroFactor}, {cutAngle}, {slope})
 参数 说明 数据类型 zeroFactor The zeroFactor will be used to position the y-intercept of the inverse linear function. (默认值为 2.0) Double cutAngle The cutAngle establishes the HRMA degree threshold beyond which the HFs are set to infinity. (默认值为 180.0) Double slope Identifies the slope of the straight line in the HRMA-HF coordinate system. Slope is specified as the rise over the run. For example, a 30-degree slope is 1/30, specified as 0.03333 (rise/run: 1 HF on the y axis / 30 degrees on the x axis). (默认值为 -0.011111) Double

## 属性

 属性 说明 数据类型 zeroFactor(读写) 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(读写) 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 slope(读写) Identifies the slope of the straight line in the HRMA-HF coordinate system. Slope is specified as the rise over the run. For example, a 30-degree slope is 1/30, specified as 0.03333 (rise/run: 1 HF on the y axis / 30 degrees on the x axis). Double

## 代码实例

HfInverseLinear 示例 1（Python 窗口）

``````import arcpy
from arcpy import env
from arcpy.sa import *
env.workspace = "C:/sapyexamples/data"
myHorizFactor = HfInverseLinear(2.0, 181.0, -0.01111)
outPathDist = PathDistance("source.shp", "costraster", "", "", myHorizFactor)
outPathDist.save("C:/sapyexamples/output/pathdisthfil")
``````
HfInverseLinear 示例 2（独立脚本）

``````# Name: HfInverseLinear_Ex_02.py
# Description: Uses the HfInverseLinear object to execute the PathDistance 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 = "source.shp"
inCostRaster = "costraster"

# Create the HfInverseLinear Object
zeroFactor = 2.0
cutAngle = 181.0
slope = -0.01111
myHorizFactor = HfInverseLinear(zeroFactor, cutAngle, slope)

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

# Execute PathDistance
outPathDist = PathDistance(inSourceData, inCostRaster, "", "", myHorizFactor)

# Save the output
outPathDist.save("C:/sapyexamples/output/pathdisthfil2")
``````

5/10/2014