解决 (网络分析)
摘要
基于网络位置和属性解决网络分析图层问题。
用法
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解决失败时,警告和错误消息可提供有关失败原因的有用信息。
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运行此工具前,请确保为网络分析图层指定了解决问题所需的所有参数。
语法
Solve_na (in_network_analysis_layer, {ignore_invalids}, {terminate_on_solve_error})
参数 | 说明 | 数据类型 |
in_network_analysis_layer |
要进行分析计算的网络分析图层。 | Network Analyst Layer |
ignore_invalids (可选) |
对于多路径配送网络分析图层,由于多路径配送解决程序要求所有网络位置都有效,因此将 HALT 作为参数值。 | Boolean |
terminate_on_solve_error (可选) |
| Boolean |
代码示例
解决示例 1(Python 窗口)
使用所有参数执行工具。
import arcpy arcpy.Solve_na("Route","HALT","TERMINATE")
解决示例 2(工作流)
以下独立 Python 脚本演示了如何使用“解决”工具执行最近设施点分析并将结果保存到图层文件中。
# Name: Solve_Workflow.py # Description: Solve a closest facility analysis to find the closest warehouse # from the store locations and save the results to a layer file on # disk. # Requirements: Network Analyst Extension #Import system modules import arcpy from arcpy import env try: #Check out the Network Analyst extension license arcpy.CheckOutExtension("Network") #Set environment settings env.workspace = "C:/data/Paris.gdb" env.overwriteOutput = True #Set local variables inNetworkDataset = "Transportation/ParisMultimodal_ND" outNALayer = "ClosestWarehouse" impedanceAttribute = "Drivetime" accumulateAttributeName = ["Meters"] inFacilities = "Analysis/Warehouses" inIncidents = "Analysis/Stores" fieldMappings = "Name NOM #" outLayerFile = "C:/data/output" + "/" + outNALayer + ".lyr" #Create a new closest facility analysis layer. Apart from finding the drive #time to the closest warehouse, we also want to find the total distance. So #we will accumulate the "Meters" impedance attribute. arcpy.MakeClosestFacilityLayer_na(inNetworkDataset,outNALayer, impedanceAttribute,"TRAVEL_TO","",1, accumulateAttributeName,"NO_UTURNS") #Load the warehouses as Facilities using the default field mappings and #search tolerance arcpy.AddLocations_na(outNALayer,"Facilities",inFacilities,"","") #Load the Stores as Incidents. Map the Name property from the NOM field arcpy.AddLocations_na(outNALayer,"Incidents",inIncidents,fieldMappings,"") #Solve the closest facility layer arcpy.Solve_na(outNALayer) #Save the solved closest facility layer as a layer file on disk using #relative paths arcpy.SaveToLayerFile_management(outNALayer,outLayerFile,"RELATIVE") print "Script completed successfully" except Exception as e: # If an error occurred, print line number and error message import traceback, sys tb = sys.exc_info()[2] print "An error occured on line %i" % tb.tb_lineno print str(e)
环境
相关主题
7/10/2012