ArcMap

多部件至单部件

描述

创建包含通过分割多部件输入要素而生成的单部件要素的要素类。

插图

多部件至单部件图示

使用方法

  • 输入要素的属性将保留在输出要素类中。向输出要素类添加新字段 ORIG_FID，并设置为输入要素 ID。

  • 多部件要素的各个部件在输出要素类中将成为独立的要素。已经是单部件的要素不会受到影响。

  • 大多数输出要素的类型与输入要素的类型相同（输入面仍为面；输入线仍为线）。唯一的例外是当输入要素类型为多点时，输出要素类的类型将为点。

  • 要使用单部件要素根据公用字段值重新构建多部件要素（例如 ORIG_FID），请使用融合工具。

  • 多面体要素将被分为其构成的几何部件。每一部件可定义为包含 X、Y 和 Z 坐标的折点集合，请形式如下所示：

    • 引用 3 个折点的单个三角形。
    • 三角条带由共享同一条公用边的多个三角形定义。
    • 三角扇由具有公用原点的多个三角形定义。
    • 表示由 4 个或更多折点定义边界的共平面区域的圆环。

语法

arcpy.management.MultipartToSinglepart(in_features, out_feature_class)
参数说明数据类型
in_features

任意要素类型的输入要素。

Feature Layer
out_feature_class

所含要素视输入要素类型而定的输出要素类。

Feature Class

代码示例

MultipartToSinglepart 示例 1（Python 窗口）

以下 Python 窗口脚本演示了如何在即时模式下使用 MultipartToSinglepart 函数。

import arcpy
arcpy.env.workspace = "C:/data"
arcpy.MultipartToSinglepart_management("landuse.shp",
                                       "c:/output/output.gdb/landuse_singlepart")
MultipartToSinglepart 示例 2（独立脚本）

以下独立脚本是演示如何在脚本环境中应用 MultipartToSinglepart 函数的简单示例。

# Name: MultipartToSinglepart_Example2.py
# Description: Break all multipart features into singlepart features,
#              and report which features were separated.
# Import system modules
import arcpy
 
# Create variables for the input and output feature classes
inFeatureClass = "c:/data/gdb.gdb/vegetation"
outFeatureClass = "c:/data/gdb.gdb/vegetation_singlepart"
try:
    # Create list of all fields in inFeatureClass
    fieldNameList = [field.name for field in arcpy.ListFields(inFeatureClass)]
    # Add a field to the input this will be used as a unique identifier
    arcpy.AddField_management(inFeatureClass, "tmpUID", "double")
 
    # Determine what the name of the Object ID is 
    OIDFieldName = arcpy.Describe(inFeatureClass).OIDFieldName
   
    # Calculate the tmpUID to the OID
    arcpy.CalculateField_management(inFeatureClass, "tmpUID",
                                    "!" + OIDFieldName + "!", "PYTHON")
 
    # Run the tool to create a new fc with only singlepart features
    arcpy.MultipartToSinglepart_management(inFeatureClass, outFeatureClass)
 
    # Check if there is a different number of features in the output
    #   than there was in the input
    inCount = int(arcpy.GetCount_management(inFeatureClass).getOutput(0))
    outCount = int(arcpy.GetCount_management(outFeatureClass).getOutput(0))
    
    if inCount != outCount:
        # If there is a difference, print out the FID of the input 
        #   features which were multipart
        arcpy.Frequency_analysis(outFeatureClass,
                                 outFeatureClass + "_freq", "tmpUID")
 
        # Use a search cursor to go through the table, and print the tmpUID 
        print("Multipart features from {0}".format(inFeatureClass))
        for row in arcpy.da.SearchCursor(outFeatureClass + "_freq",
                                         ["tmpUID"], "FREQUENCY > 1"):
            print(int(row[0]))
    else:
        print("No multipart features were found")
except arcpy.ExecuteError:
    print(arcpy.GetMessages())
except Exception as err:
    print(err.args[0])

环境

许可信息

  • Basic: 是
  • Standard: 是
  • Advanced: 是

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