Neighborhood Selection (Geostatisical Analyst)

Summary

Creates a layer of points based on a user-defined neighborhood.

The output layer contains the selection set of 10 selected blue points.

For example, you might wish to create a selection of points in a circular neighborhood around a location defined by the Input point. The illustration above demonstrates that the output will be the 10 points, colored blue, that fall within the circle.

Usage

• This tool can be used in conjunction with the interpolation tools when different searching_neighborhoods are examined.

Syntax

GANeighborhoodSelection_ga (in_dataset, out_layer, point_coord, neighbors_max, neighbors_min, minor_semiaxis, major_semiaxis, angle, {shape_type})

Parameter	Explanation	Data Type
in_dataset	Points used to create a neighborhood selection.	Feature Layer
out_layer	Layer to store the neighborhood selection.	Feature Layer
point_coord	The neighborhood center's x,y coordinate.	Point
neighbors_max	The number of points to use in each sector. If a sector has the required number of points, all points in that sector are used.	Long
neighbors_min	The minimum number of points to use in each sector. If the minimum number of required points are not available in any given sector, the nearest available point outside the sector will be selected.	Long
minor_semiaxis	Size of the minor semiaxis of the search neighborhood.	Double
major_semiaxis	Size of the major semiaxis of the search neighborhood.	Double
angle	The angle of rotation of the neighborhood axis.	Double
shape_type (Optional)	The geometry of the neighborhood. ONE SECTOR — Single ellipse FOUR SECTORS — Ellipse divided into four sectors FOUR SECTOR SHIFTED — Ellipse divided into four sectors and shifted 45 degrees EIGHT SECTORS — Ellipse divided into eight sectors	String

Code Sample

NeighborhoodSelection example 1 (Python window)

Create a feature layer based on some neighborhood criteria.

import arcpy
from arcpy import env
env.workspace = "C:/gapyexamples/data"
arcpy.GANeighborhoodSelection_ga("ca_ozone_pts", "outNS", "-2000000 -50000", 
                                 "20", "5","200000", "200000", "0", "One sector")

NeighborhoodSelection example 2 (stand-alone script)

Create a feature layer based on some neighborhood criteria.

# Name: NeighborhoodSelection_Example_02.py
# Description: Creates a layer of points based on a user-defined neighborhood.
# Requirements: Geostatistical Analyst Extension

# Import system modules
import arcpy

# Set environment settings
arcpy.env.workspace = "C:/gapyexamples/data"

# Set local variables
inPoints = "ca_ozone_pts.shp"
outLayer = "outNS"
pointCoord = "-2000000 -50000"
maxNeighbors = 20
minNeighbors = 5
majSemiaxis = 200000
minSemiaxis = 200000
angle = 0
shape = "One Sector"

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

# Execute NeighborhoodSelection
arcpy.GANeighborhoodSelection_ga(inPoints, outLayer, pointCoord, maxNeighbors,
                                 minNeighbors, majSemiaxis, minSemiaxis, angle,
                                 shape)

Environments

Current Workspace

Licensing Information

ArcView: Requires Geostatistical Analyst

ArcEditor: Requires Geostatistical Analyst

ArcInfo: Requires Geostatistical Analyst