ArcMap

多部件至单部件

摘要

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

Multipart to Singlepart illustration

用法

  • 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。

  • 多部件输入要素的各个部件在输出要素类中将成为独立的单部件要素。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。

语法

MultipartToSinglepart_management (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

  • ArcGIS Desktop Basic: 是
  • ArcGIS Desktop Standard: 是
  • ArcGIS Desktop Advanced: 是

相关主题