概化 (编辑)
摘要
使用道格拉斯-普克简化算法和指定的最大偏移容差来简化输入要素。输出要素将包含原始输入折点的子集。
插图
用法
语法
Generalize_edit (in_features, {tolerance})
参数 | 说明 | 数据类型 |
in_features |
要概化的面或线要素。 | Feature Layer |
tolerance (可选) |
此容差可设定最大允许偏移量,这会确定简化程度。该值会限制输出几何与输入几何的容许偏移距离。可以指定首选测量单位。默认值为要素单位。 | Linear unit |
代码实例
概化示例(Python 窗口)
以下 Python 窗口脚本演示了如何在即时模式下使用“概化”函数:
import arcpy from arcpy import env env.workspace = "C:\data\data.gdb" arcpy.Generalize_edit("zones", "10 Feet")
概化示例 2(独立脚本)
以下独立脚本是如何在先对要素进行简化再进行缓冲的工作流中使用“概化”函数的示例:
#Name: BufferZones.py #Purpose: Simplify features using the Generalize tool and then Buffer them #Author: ESRI #Import script modules import arcpy from arcpy import env try: #Set the workspace env.workspace = "C:/data/data.gdb" #Set local parameters inFeatures = "zones" gTolerance = "4 Feet" copFeatures = "zones_cp" bufDist = "50 Miles" bufOutput = "zones_buff" #Since Generalize permanently updates the input, first make a copy of the original FC arcpy.CopyFeatures_management (inFeatures, copFeatures) #Use the Generalize tool to simplify the Buffer input to shorten Buffer processing time arcpy.Generalize_edit(copFeatures, gTolerance) #Buffer the output arcpy.Buffer_analysis(copFeatures, bufOutput, bufDist, "", "", "", "") 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
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许可信息
ArcGIS for Desktop Basic:否
ArcGIS for Desktop Standard:是
ArcGIS for Desktop Advanced:是
9/15/2013