带渲染的聚类/异常值分析 (空间统计)

许可等级:BasicStandardAdvanced

摘要

给定一组加权要素,利用 Anselin 提出的局部 Moran's I 统计量识别出热点、冷点和空间异常值。然后,将由冷到热的渲染方式应用于 z 得分结果。

法律声明法律声明:

由于 ArcGIS 新特性中允许脚本和模型工具的输出与默认渲染相关联,此工具将在 ArcGIS 10.1 之后的版本中弃用

插图

Cluster and Outlier Analysis illustration

用法

语法

ClustersOutliersRendered_stats (Input_Feature_Class, Input_Field, Output_Layer_File, Output_Feature_Class)
参数说明数据类型
Input_Feature_Class

要执行聚类分析的要素类。

Feature Layer
Input_Field

要评估的字段。

Field
Output_Layer_File

用于存储渲染信息的输出图层文件。

Layer File
Output_Feature_Class

接收结果字段、z 得分、p 值和聚类类型标识的输出要素类。

Feature Class

代码实例

带渲染的聚类/异常值分析示例(Python 窗口)

以下 Python 窗口脚本演示了“带渲染的聚类/异常值分析”工具的使用方法。

import arcpy
arcpy.env.workspace = "c:/data/911calls"
arcpy.ClustersOutliersRendered_stats("911Count.shp", "ICOUNT","911ClusterOutlier_rendered.lyr", "911ClusterOutlier.shp")
带渲染的聚类/异常值分析示例(独立 Python 脚本)。

以下独立 Python 脚本演示了“带渲染的聚类/异常值分析”工具的使用方法。

# Analyze the spatial distribution of 911 calls in a metropolitan area
# using the Cluster-Outlier Analysis with Rendering Tool (Anselin's Local Moran's I)

# Import system modules
import arcpy

# Set geoprocessor object property to overwrite outputs if they already exist
arcpy.gp.OverwriteOutput = True

# Local variables...
workspace = r"C:\Data\911Calls"

try:
    # Set the current workspace (to avoid having to specify the full path to the feature classes each time)
    arcpy.env.workspace = workspace

    # Copy the input feature class and integrate the points to snap
    # together at 500 feet
    # Process: Copy Features and Integrate
    cf = arcpy.CopyFeatures_management("911Calls.shp", "911Copied.shp",
                         "#", 0, 0, 0)

    integrate = arcpy.Integrate_management("911Copied.shp #", "500 Feet")

    # Use Collect Events to count the number of calls at each location
    # Process: Collect Events
    ce = arcpy.CollectEvents_stats("911Copied.shp", "911Count.shp", "Count", "#")

    # Cluster/Outlier Analysis of 911 Calls
    # Process: Local Moran's I
    clusters = arcpy.ClustersOutliersRendered_stats("911Count.shp", "ICOUNT", 
                        "911ClusterOutlier_rendered.lyr", "911ClusterOutlier.shp")

except:
    # If an error occurred when running the tool, print out the error message.
    print arcpy.GetMessages()

环境

输出坐标系

在分析之前,会将要素几何投影到“输出坐标系”,这样,为距离范围或距离阈值参数输入的值会与“输出坐标系”中指定的值一致。所有数学计算都基于“输出坐标系”的空间参考进行。

相关主题

许可信息

ArcGIS for Desktop Basic:是
ArcGIS for Desktop Standard:是
ArcGIS for Desktop Advanced:是
9/15/2013