面转线 (Data Management)

许可等级:BasicStandardAdvanced

摘要

创建的要素类中将包含由面边界转换而来的线(无论是否考虑邻近面)。

插图

Polygon To Line illustration

用法

语法

PolygonToLine_management (in_features, out_feature_class, {neighbor_option})
参数说明数据类型
in_features

几何必须为面的输入要素。

Feature Layer
out_feature_class

输出线要素类。

Feature Class
neighbor_option
(可选)

指定是否识别并存储面邻域信息。

  • IDENTIFY_NEIGHBORS识别面邻域关系并将该关系存储在输出中。如果某个面的不同线段与不同的面共用边界,那么该边界将被分割成各个唯一公用的线段,这些线段的两个邻近面 FID 值将存储在输出中。这是默认设置。
  • IGNORE_NEIGHBORS忽略面邻域关系;每个面边界均将变为线要素,并且边界原始面要素 ID 将存储在输出中。
Boolean

代码实例

面转线 (PolygonToLine) 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 PolygonToLine 函数。

import arcpy
from arcpy import env
env.workspace = "C:/data"
arcpy.PolygonToLine_management("Habitat_Analysis.gdb/vegtype", 
                               "C:/output/Output.gdb/vegtype_lines",
                               "IGNORE_NEIGHBORS")
面转线 (PolygonToLine) 示例 2(独立脚本)

以下独立脚本是如何在脚本环境中应用 PolygonToLine 函数的简单示例。

# Name: PolygonToLine_Example2.py
# Description: Use PolygonToLine function to convert polygons to lines,
#              and report how many shared or overlapping boundary lines
#              were found.
# 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 = "bldgs"
outFeatureClass = "bldgs_lines"
 
# Use error trapping in case a problem occurs when running the tool
try:
    # Run PolygonToLine to convert polygons to lines using default neighbor_option
    arcpy.PolygonToLine_management(inFeatureClass, outFeatureClass)
 
    # Select lines that have LEFT_FID values greater than -1
    arcpy.MakeFeatureLayer_management(outFeatureClass, "selection_lyr", 
                                      "\"LEFT_FID\" > -1")
    result = arcpy.GetCount_management("selection_lyr")

    if (result.getOutput(0) == "0"):
        print "No overlapping or shared boundary lines were found."
    else:
        print result.getOutput(0) + " overlapping or shared " +\
              "boundary lines were found."
 
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

ArcGIS for Desktop Basic: 否
ArcGIS for Desktop Standard: 否
ArcGIS for Desktop Advanced: 是
5/10/2014