描述
基于网络位置和属性求解网络分析图层问题。
使用方法
语法
arcpy.na.Solve(in_network_analysis_layer, {ignore_invalids}, {terminate_on_solve_error}, {simplification_tolerance}, {overrides})| 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） | 指定是否忽略无效的输入位置。
| Boolean |
terminate_on_solve_error （可选） | 指定在求解过程中遇到错误时是否应终止工具执行。
| Boolean |
simplification_tolerance （可选） | 容差确定输出几何的简化程度。如果已指定了容差，容差必须大于零。可以选择首选单位；默认单位为十进制度。 指定简化容差会减少渲染路径或服务区的时间。但缺点是，简化几何移除了折点，这样会降低以更大比例输出的空间精确度。 由于带两个折点的线不能再简化，所以此参数对单一线段输出的绘制时间没有影响，例如直线路线、 OD 成本矩阵线和位置分配线。 | Linear Unit |
overrides （可选） | 求解网络分析问题时，指定可影响求解程序行为的其他设置。 需要在 JavaScript 对象表示法 (JSON) 中指定此参数的值。例如，有效值的格式如下：{"overrideSetting1" : "value1", "overrideSetting2" : "value2"}。覆盖设置名称始终以双引号括起。该值可以是数字、布尔值或字符串。 此参数的默认值为无值，表示不覆盖任何求解程序设置。 覆盖是高级设置，应仅在谨慎分析应用设置前后得到的结果之后使用。要获得每个求解程序支持的覆盖设置及其可接受值的列表，请联系 Esri 技术支持。 | String |
派生输出
| 名称 | 说明 | 数据类型 |
| output_layer | 已求解的网络分析图层。 | 网络分析图层 |
| solve_succeeded | 指示求解是否成功的布尔值。 | 布尔型 |
代码示例
使用所有参数执行工具。
arcpy.na.Solve("Route", "HALT", "TERMINATE", "10 Meters")以下独立 Python 脚本演示了如何使用 Solve 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
import os
try:
#Check out Network Analyst license if available. Fail if the Network Analyst license is not available.
if arcpy.CheckExtension("network") == "Available":
arcpy.CheckOutExtension("network")
else:
raise arcpy.ExecuteError("Network Analyst Extension license is not available.")
#Set environment settings
output_dir = "C:/Data"
#The NA layer's data will be saved to the workspace specified here
env.workspace = os.path.join(output_dir, "Output.gdb")
env.overwriteOutput = True
#Set local variables
input_gdb = "C:/Data/Paris.gdb"
network = os.path.join(input_gdb, "Transportation", "ParisMultimodal_ND")
layer_name = "ClosestWarehouse"
travel_mode = "Driving Time"
facilities = os.path.join(input_gdb, "Analysis", "Warehouses")
incidents = os.path.join(input_gdb, "Analysis", "Stores")
output_layer_file = os.path.join(output_dir, layer_name + ".lyrx")
#Create a new closest facility analysis layer.
result_object = arcpy.na.MakeClosestFacilityAnalysisLayer(network,
layer_name, travel_mode,
"TO_FACILITIES",
number_of_facilities_to_find=1)
#Get the layer object from the result object. The closest facility layer can
#now be referenced using the layer object.
layer_object = result_object.getOutput(0)
#Get the names of all the sublayers within the closest facility layer.
sublayer_names = arcpy.na.GetNAClassNames(layer_object)
#Stores the layer names that we will use later
facilities_layer_name = sublayer_names["Facilities"]
incidents_layer_name = sublayer_names["Incidents"]
#Load the warehouses as Facilities using the default field mappings and
#search tolerance
arcpy.na.AddLocations(layer_object, facilities_layer_name,
facilities, "", "")
#Load the stores as Incidents. Map the Name property from the NOM field
#using field mappings
field_mappings = arcpy.na.NAClassFieldMappings(layer_object,
incidents_layer_name)
field_mappings["Name"].mappedFieldName = "NOM"
arcpy.na.AddLocations(layer_object, incidents_layer_name, incidents,
field_mappings, "")
#Solve the closest facility layer
arcpy.na.Solve(layer_object)
#Save the solved closest facility layer as a layer file on disk
layer_object.saveACopy(output_layer_file)
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 occurred on line %i" % tb.tb_lineno)
print(str(e))环境
许可信息
- Basic: 受限
- Standard: 受限
- Advanced: 受限