收集事件并渲染 (空间统计)

摘要

首先将事件数据转换为加权点数据，然后使用分级圆圈对生成的计数字段进行渲染。

旧版本：

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

用法

• 收集事件并渲染工具是一个将收集事件工具与计数渲染工具结合起来的合成模型。

• 自 ArcGIS 9.3 开始，收集事件工具中的输出要素类会自动添加到内容列表中（将默认分级圆圈渲染应用于 ICOUNT 字段）。

语法

CollectEventsRendered_stats (Input_Incident_Features, Output_Layer, Output_Weighted_Point_Feature_Class)

参数	说明	数据类型
Input_Incident_Features	表示事件或事件点数据的要素。	Feature Layer
Output_Layer	用于存储分级圆圈渲染信息的图层文件 (.lyr)。	Layer File
Output_Weighted_Point_Feature_Class	包含加权点数据的输出要素类。	Feature Class

代码示例

收集事件并渲染示例（Python 窗口）

以下 Python 窗口脚本演示了“收集事件并渲染”工具的使用方法。

import arcpy
arcpy.env.workspace = "C:/Data"
arcpy.CollectEventsRendered_stats("911.shp", "911Count_rendered.lyr", "911Count.shp")

收集事件并渲染示例（独立 Python 脚本）

以下独立 Python 脚本演示了“收集事件并渲染”工具的使用方法。

# Analyze the spatial distribution of 911 calls in a metropolitan area
# using the Hot-Spot Analysis Tool (Local Gi*)

# Import system modules
import arcpy

# Set geoprocessor object property to overwrite existing output, by default
arcpy.gp.overwriteOutput = True

# Local variables...
workspace = "C:/Data"

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.CollectEventsRendered_stats("911Copied.shp", "911Count_rendered.lyr", "911Count.shp")

    # Add a unique ID field to the count feature class
    # Process: Add Field and Calculate Field
    af = arcpy.AddField_management("911Count.shp", "MyID", "LONG", "#", "#", "#", "#",
                     "NON_NULLABLE", "NON_REQUIRED", "#",
                     "911Count.shp")
    
    cf = arcpy.CalculateField_management("911Count.shp", "MyID", "[FID]", "VB")

    # Create Spatial Weights Matrix for Calculations
    # Process: Generate Spatial Weights Matrix... 
    swm = arcpy.GenerateSpatialWeightsMatrix_stats("911Count.shp", "MYID",
                        "euclidean6Neighs.swm",
                        "K_NEAREST_NEIGHBORS",
                        "#", "#", "#", 6,
                        "NO_STANDARDIZATION") 

    # Hot Spot Analysis of 911 Calls
    # Process: Hot Spot Analysis (Getis-Ord Gi*)
    hs = arcpy.HotSpots_stats("911Count.shp", "ICOUNT", "911HotSpots.shp", 
                     "GET_SPATIAL_WEIGHTS_FROM_FILE",
                     "EUCLIDEAN_DISTANCE", "NONE",
                     "#", "#", "euclidean6Neighs.swm")

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

环境

当前工作空间, 临时工作空间, 输出坐标系, 输出包含 Z 值, 默认输出 Z 值, 输出包含 M 值