HfBinary
摘要
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.
插图
讨论
The HfBinary object is used in the Spatial Analyst tools: Path Distance, Path Distance Allocation, and Path Distance Back Link.
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.
语法
参数 | 说明 | 数据类型 |
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.) (默认值为 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.) (默认值为 45) | Double |
属性
属性 | 说明 | 数据类型 |
zeroFactor (可读写) |
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 (可读写) |
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 |
代码示例
Demonstrates how to create a HFBinary class and use it in the PathDistance 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) outPathDist = PathDistance("source.shp", "elevation", "", "", myHfBinary) outPathDist.save("C:/sapyexamples/output/pathdisthfb")
Performs a PathDistance analysis using the HFBinary class.
# Name: HfBinary_Ex_02.py # Description: Uses the HFBinary 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 = "sourcepts.shp" inCostRaster = "elevation" # 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 outPathDist = PathDistance(inSourceData, inCostRaster, "", "", myHorizFactor) # Save the output outPathDist.save("C:/sapyexamples/output/pathdisthfb2")