多部分(multipart)至单部分(singlepart) (数据管理)
摘要
创建包含通过分割多部分输入要素而生成的单部分要素的要素类。
插图
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用法
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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。
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多部分输入要素的各个部分在输出要素类中将成为独立的单部分要素。已经是单部分的要素不会受到影响。
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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。
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要使用单部分要素根据公用字段值重新构建多部分要素（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立即模式下使用 MultipartToSinglepart 函数。
import arcpy from arcpy import env 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. # Author: ESRI # import system modules import arcpy from arcpy import env # Set environment settings env.workspace = "C:/data/landcovers.gdb" # Create variables for the input and output feature classes inFeatureClass = "vegetation" outFeatureClass = "vegetation_singlepart" # Use error trapping in case a problem occurs when running the tool try: # 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 # Get the results of GetCount for input and output resultIn = arcpy.GetCount_management(inFeatureClass) resultOut = arcpy.GetCount_management(outFeatureClass) if (resultIn.getOutput(0) == resultOut.getOutput(0)): print "The number of features in the input is the same as in the output," +\ "so no multipart features were found" else: # If there is a difference, print out the FID of the input features # which were multipart arcpy.Frequency_analysis(outFeatureClass, outFeatureClass + "_freq", "ORIG_FID") # Use a search cursor to go through the table, and print the ORIG_FID print "Here are the FIDs of all the multipart features from " + inFeatureClass rows = arcpy.SearchCursor(outFeatureClass + "_freq", "\"FREQUENCY\" > 1") row = rows.next() while row: print int(row.ORIG_FID) row = rows.next() except Exception, e: # If an error occurred, print line number and error message import traceback, sys tb = sys.exc_info()[2] print "Line %i" % tb.tb_lineno print e.message
环境
相关主题
许可信息
ArcView: 是
ArcEditor: 是
ArcInfo: 是
7/10/2012