RadiusFixed

摘要

Defines a fixed search radius by specifing a distance and a minimum number of points required for analysis. If the required number of points is not found within the specified distance, the search radius will be increased until the specified minimum number of points is found.

讨论

Tools that use radius objects: Kriging and IDW.

语法

RadiusFixed ({distance}, {minNumberOfPoints})

参数	说明	数据类型
distance	The distance specifies the distance as a radius within which input sample points will be used to perform the interpolation. The value of the radius is expressed in map units. The default radius is five times the cell size of the output raster.	Double
minNumberOfPoints	The minNumberOfPoints is an integer defining the minimum number of points to be used to perform the interpolation. If the required number of points is not found within the specified distance, the search distance will be increased until the specified minimum number of points is found. When the search radius needs to be increased, it is done so until the minNumberOfPoints fall within that radius, or the extent of the radius crosses the lower (southern) and/or upper (northern) extent of the output raster. NoData is assigned to all locations that do not satisfy the above condition. (默认值为 0)	Long

属性

属性	说明	数据类型
distance （可读写）	The distance, in map units, specifying that all input sample points within the specified radius will be used to perform interpolation.	Double
minNumberOfPoints （可读写）	The minNumberOfPoints is an integer defining the minimum number of points to be used for interpolation. If the required number of points is not found within the specified distance, the search distance will be increased until the specified minimum number of points is found.	Long

代码示例

RadiusFixed example 1 (Python window)

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

import arcpy
from arcpy import env
from arcpy.sa import *
env.workspace = "C:/sapyexamples/data"
myRadius = RadiusFixed(80000)
outKriging = Kriging("ca_ozone_pts.shp", "ELEVATION", "SPHERICAL", "", myRadius)
outKriging.save("C:/sapyexamples/output/krigradfix")

RadiusFixed example 2 (stand-alone script)

Calculates a surface with the Idw interpolation tool using the RadiusFixed class.

# Name: RadiusFixed_Ex_02.py
# Description: Uses the RadiusFixed object to execute IDW 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
inFeature = "ca_ozone_pts.shp"

# Create the Radius Object
distance = 15000
minNumPoints = 3
searchRadius = RadiusFixed(distance, minNumPoints)

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

# Execute IDW
outRadFix = Idw(inFeature, "elevation", 2000, 2, searchRadius)

# Save the output 
outRadFix.save("C:/sapyexamples/output/idwradfix")