描述
创建路径网络分析图层并设置其分析属性。路径分析图层可用于根据指定的网络成本确定一组网络位置之间的最佳路径。该图层可通过本地网络数据集进行创建，也可通过在线托管路径服务或门户托管路径服务进行创建。
使用方法
通过此工具创建分析图层后，您可以使用添加位置工具向图层中添加网络分析对象；使用求解工具来求解分析；以及使用保存至图层文件工具将结果保存到磁盘中。
在地理处理模型中使用此工具时，如果模型作为工具来运行，则必须将输出网络分析图层创建为模型参数；否则，输出图层将无法添加到地图内容中。
在 ArcGIS Pro 中，网络分析图层数据存储在文件地理数据库要素类中的磁盘上。在工程中创建网络分析图层时，将在当前工作空间环境的新要素数据集中创建图层数据。在 Python 脚本中创建网络分析图层时，您必须首先使用 arcpy.env.workspace = "<path to file gdb>" 将工作空间环境显式地设置到想要存储图层数据的文件地理数据库。创建图层后，将向该文件地理数据库添加一个包含相应子图层要素类的新要素数据集。
语法
arcpy.na.MakeRouteAnalysisLayer(network_data_source, {layer_name}, {travel_mode}, {sequence}, {time_of_day}, {time_zone}, {line_shape}, {accumulate_attributes}, {generate_directions_on_solve}, {time_zone_for_time_fields})| 参数 | 说明 | 数据类型 |
network_data_source | 将对其执行网络分析的网络数据集或服务。将门户 URL 用于服务。 | Network Dataset Layer;String |
layer_name （可选） | 要创建的网络分析图层的名称。 | String |
travel_mode （可选） | 分析中使用的出行模式名称。出行模式为一组网络设置（例如行驶限制和 U 形转弯），用于确定行人、车辆、卡车或其他交通媒介在网络中的移动方式。出行模式在网络数据源中进行定义。 arcpy.na.TravelMode 对象和包含出行模式有效 JSON 表示的字符串也可用作参数的输入。 | String |
sequence （可选） | 指定在计算最佳路径时是否必须以特定顺序访问输入停靠点。此选项将路径分析由最短路径问题变为流动推销员问题 (TSP)。
| String |
time_of_day （可选） | 路径的开始日期和时间。路径开始时间通常用于查找阻抗属性随当日时间变化的路径。例如，开始时间 7:00 a.m. 可用于查找被认为是高峰时段流量的路径。此参数的默认值为 8:00 a.m.。可将日期和时间指定为 10/21/05 10:30 AM。如果路径跨越多天，则仅指定开始时间，并使用当前日期。 可使用以下日期来指定一周中的每一天，而无需使用特定的日期：
例如，要指定行程从星期二 5:00 p.m. 开始，则请将该参数值指定为 1/2/1900 5:00 PM。 求解结束后，在输出路径中填充路径的开始时间与结束时间。也会在生成方向时使用这些开始时间和结束时间。 | Date |
time_zone （可选） | 指定 time_of_day 参数的时区。
| String |
line_shape （可选） | 为分析所输出的路径要素指定形状类型。
无论选择何种输出形状类型，最佳路径始终由网络阻抗（而非欧氏距离）决定。这表示只是路径形状不同，而对网络进行的基础遍历则相同。 | String |
accumulate_attributes [accumulate_attributes,...] （可选） | 分析过程中要累积的成本属性的列表。这些累积属性仅供参考；求解程序仅使用求解分析时指定的出行模式所使用的成本属性。 对于每个累积的成本属性，会在网络分析输出要素中填充 Total_[Impedance] 属性。 如果网络数据源为 ArcGIS Online 服务，或如果网络数据源是不支持累积的 Portal for ArcGIS 版本上的服务，则此参数不可用。 | String |
generate_directions_on_solve （可选） | 指定运行分析时是否生成方向。
对于不需要生成转向指示的分析，使用 NO_DIRECTIONS 选项可以减少求解分析的时间。 | Boolean |
time_zone_for_time_fields （可选） | 指定将用于解释输入表中包括的时间字段（例如用于时间窗口的字段）的时区。
| String |
派生输出
| 名称 | 说明 | 数据类型 |
| out_network_analysis_layer | 输出网络分析图层。 | 网络分析图层 |
代码示例
仅使用必需参数执行此工具。
network = "C:/Data/SanFrancisco.gdb/Transportation/Streets_ND"
arcpy.na.MakeRouteAnalysisLayer(network, "WorkRoute")使用所有参数执行此工具。
network = "C:/Data/SanFrancisco.gdb/Transportation/Streets_ND"
arcpy.na.MakeRouteAnalysisLayer(network, "InspectionRoute", "Driving Time",
"FIND_BEST_ORDER", "1/1/1900 9:00 AM", "UTC",
"ALONG_NETWORK", ["Meters", "TravelTime"])以下独立 Python 脚本演示了如何使用 MakeRouteAnalysisLayer 工具查找访问地理编码停靠点位置的最佳路径。
# Name: MakeRouteAnalysisLayer_Workflow.py
# Description: Find a best route to visit the stop locations and save the
# route to a layer file. The stop locations are geocoded from a
# text file containing the addresses.
# 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/SanFrancisco.gdb"
network = os.path.join(input_gdb, "Transportation", "Streets_ND")
layer_name = "BestRoute"
travel_mode = "Driving Time"
address_locator = "C:/Data/SanFranciscoLocator"
address_table = "C:/Data/StopAddresses.csv"
address_fields = "Street Address;City City;State State;ZIP <None>"
out_stops = "GeocodedStops"
output_layer_file = os.path.join(output_dir, layer_name + ".lyrx")
#Create a new Route layer. For this scenario, the default values for all the
#remaining parameters statisfy the analysis requirements
result_object = arcpy.na.MakeRouteAnalysisLayer(network, layer_name,
travel_mode)
#Get the layer object from the result object. The route layer can now be
#referenced using the layer object.
layer_object = result_object.getOutput(0)
#Get the names of all the sublayers within the route layer.
sublayer_names = arcpy.na.GetNAClassNames(layer_object)
#Stores the layer names that we will use later
stops_layer_name = sublayer_names["Stops"]
#Geocode the stop locations from a csv file containing the addresses.
#The Geocode Addresses tool can use a text or csv file as input table
#as long as the first line in the file contains the field names.
arcpy.geocoding.GeocodeAddresses(address_table, address_locator,
address_fields, out_stops)
#Load the geocoded address locations as stops mapping the address field from
#geocoded stop features as Name property using field mappings.
field_mappings = arcpy.na.NAClassFieldMappings(layer_object,
stops_layer_name)
field_mappings["Name"].mappedFieldName = "Address"
arcpy.na.AddLocations(layer_object, stops_layer_name, out_stops,
field_mappings, "")
#Solve the route layer, ignoring any invalid locations such as those that
#cannot be geocoded
arcpy.na.Solve(layer_object, "SKIP")
#Save the solved route 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))本示例展示如何在单次求解中创建多条路径，这种方法可用于计算起始点-目的地对间的距离或行驶时间。
旧版本：
GetNASublayer 功能可用于检索网络分析图层的子图层。它是在 ArcGIS Pro 2.7 中引入的。在以前的软件版本中，检索网络分析图层的子图层对象的最佳方法是使用网络分析 Layer 对象的 listLayers 方法，该方法将子图层名称用作通配符。
# Name: MakeRouteAnalysisLayer_MultiRouteWorkflow.py
# Description: Calculate the home-work commutes for a set of people and save
# the output to a feature class
# Requirements: Network Analyst Extension
#Import system modules
import arcpy
from arcpy import env
import datetime
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/SanFrancisco.gdb"
network = os.path.join(input_gdb, "Transportation", "Streets_ND")
stops_home = os.path.join(input_gdb, "Analysis", "Commuters_Home")
stops_work = os.path.join(input_gdb, "Analysis", "Commuters_Work")
layer_name = "Commuters"
out_routes_featureclass = "Commuter_Routes"
travel_mode = "Driving Time"
#Set the time of day for the analysis to 8AM on a generic Monday.
start_time = datetime.datetime(1900, 1, 1, 8, 0, 0)
#Create a new Route layer. Optimize on driving time, but compute the
#distance traveled by accumulating the Meters attribute.
result_object = arcpy.na.MakeRouteAnalysisLayer(network, layer_name,
travel_mode, time_of_day=start_time,
accumulate_attributes=["Meters"])
#Get the layer object from the result object. The route layer can now be
#referenced using the layer object.
layer_object = result_object.getOutput(0)
#Get the names of all the sublayers within the route layer.
sublayer_names = arcpy.na.GetNAClassNames(layer_object)
#Stores the layer names that we will use later
stops_layer_name = sublayer_names["Stops"]
routes_layer_name = sublayer_names["Routes"]
#Before loading the commuters' home and work locations as route stops, set
#up field mapping. Map the "Commuter_Name" field from the input data to
#the RouteName property in the Stops sublayer, which ensures that each
#unique Commuter_Name will be placed in a separate route. Matching
#Commuter_Names from stops_home and stops_work will end up in the same
#route.
field_mappings = arcpy.na.NAClassFieldMappings(layer_object, stops_layer_name)
field_mappings["RouteName"].mappedFieldName = "Commuter_Name"
#Add the commuters' home and work locations as Stops. The same field mapping
#works for both input feature classes because they both have a field called
#"Commuter_Name"
arcpy.na.AddLocations(layer_object, stops_layer_name, stops_home,
field_mappings, "")
arcpy.na.AddLocations(layer_object, stops_layer_name, stops_work,
field_mappings, "", append="APPEND")
#Solve the route layer.
arcpy.na.Solve(layer_object)
# Get the output Routes sublayer and save it to a feature class
routes_sublayer = arcpy.na.GetNASublayer(layer_object, "Routes")
arcpy.management.CopyFeatures(routes_sublayer, out_routes_featureclass)
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: 是
- Standard: 是
- Advanced: 是