Make Closest Facility Analysis Layer (Network Analyst)

Summary

Makes a closest facility network analysis layer and sets its analysis properties. A closest facility analysis layer is useful in determining the closest facility or facilities to an incident based on a specified travel mode. The layer can be created using a local network dataset or a service hosted online or in a portal.

Usage

• After creating the analysis layer with this tool, you can add network analysis objects to it using the Add Locations tool, solve the analysis using the Solve tool, and save the results on disk using the Save To Layer File tool.

• When using this tool in geoprocessing models, if the model is run as a tool, the output network analysis layer must be made a model parameter; otherwise, the output layer is not added to the contents of the map.

• In ArcGIS AllSource, network analysis layer data is stored on disk in file geodatabase feature classes. When creating a network analysis layer in a project, the layer's data will be created in a new feature dataset in the Current Workspace environment. When creating a network analysis layer in a Python script, you must first explicitly set the workspace environment to a file geodatabase where you want the layer's data to be stored using arcpy.env.workspace = "<path to file gdb>". When the layer is created, a new feature dataset containing the appropriate sublayer feature classes will be added to this file geodatabase.

Parameters

Dialog

Label	Explanation	Data Type
Network Data Source	The network dataset or service on which the network analysis will be performed. Use the portal URL for a service.	Network Dataset Layer;String
Layer Name (Optional)	The name of the network analysis layer that will be created.	String
Travel Mode (Optional)	The name of the travel mode that will be used in the analysis. The travel mode represents a collection of network settings, such as travel restrictions and U-turn policies, that determine how a pedestrian, car, truck, or other medium of transportation moves through the network. Travel modes are defined on your network data source. An arcpy.na.TravelMode object and a string containing the valid JSON representation of a travel mode can also be used as input to this parameter.	String
Travel Direction (Optional)	Specifies the direction of travel between facilities and incidents. The direction of travel may influence the facilities found if the network contains one-way streets or impedances based on the direction of travel. For instance, it may take 10 minutes to drive from a particular incident to a particular facility, but the journey may take 15 minutes traveling in the other direction, from the facility to the incident, because of one-way streets or different traffic conditions. Toward facilities—Direction of travel is from incidents to facilities. Retail stores commonly use this setting, since they are concerned with the time it takes the shoppers (incidents) to reach the store (facility). This is the default. Away from facilities—Direction of travel is from facilities to incidents. Fire departments commonly use this setting, since they are concerned with the time it takes to travel from the fire station (facility) to the location of the emergency (incident).	String
Cutoff (Optional)	The impedance value at which to stop searching for facilities for a given incident in the units of the impedance attribute used by the Travel Mode value. This cutoff can be overridden on a per-incident basis by specifying individual cutoff values in the incidents sublayer when the Travel Direction parameter is set to Toward facilities or on a per-facility basis by specifying individual cutoff values in the facilities sublayer when the Travel Direction parameter is set to Away from facilities. By default, no cutoff is used for the analysis.	Double
Number of Facilities to Find (Optional)	The number of closest facilities to find per incident. This default can be overridden by specifying an individual value for the TargetFacilityCount property in the incidents sublayer. The default number of facilities to find is one.	Long
Time of Day (Optional)	The time and date at which the routes will begin or end. The interpretation of this value depends on whether Time of Day Usage is set to be the start time or the end time of the route. If you chose a traffic-based impedance attribute, the solution will be generated given dynamic traffic conditions at the time of day specified here. A date and time can be specified as 5/14/2012 10:30 AM. Configure the analysis to use one of the following special dates to model a day of the week or the current date instead of a specific, static date: Today—12/30/1899 Sunday—12/31/1899 Monday—1/1/1900 Tuesday—1/2/1900 Wednesday—1/3/1900 Thursday—1/4/1900 Friday—1/5/1900 Saturday—1/6/1900 Learn more about how dates and times are used and interpreted in a network analysis	Date
Time Zone (Optional)	The time zone of the Time of Day parameter. Local time at locations—The Time of Day parameter refers to the time zone in which the facilities or incidents are located. This is the default. If Time of Day Usage is set to Start time and Travel Direction is set to Away from facilities, this is the time zone of the facilities. If Time of Day Usage is set to Start time and Travel Direction is set to Toward facilities, this is the time zone of the incidents. If Time of Day Usage is set to End time and Travel Direction is set to Away from facilities, this is the time zone of the incidents. If Time of Day Usage is set to End time and Travel Direction is set to Toward facilities, this is the time zone of the facilities. UTC—The Time of Day parameter refers to coordinated universal time (UTC). Choose this option if you want to find what's nearest for a specific time, such as now, but aren't certain in which time zone the facilities or incidents will be located.	String
Time of Day Usage (Optional)	Specifies whether the value of the Time of Day parameter represents the arrival or departure time for the route or routes. Start time—The Time of Day parameter value is interpreted as the departure time from the facility or incident. This is the default.When this setting is chosen, the Time of Day parameter indicates that the solver will find the best route given a departure time. End time—The Time of Day parameter value is interpreted as the arrival time at the facility or incident. This option is useful if you want to know the time to depart from a location so you arrive at the destination at the time specified in the Time of Day parameter.	String
Line Shape (Optional)	Specifies the shape type that will be used for the route features that are output by the analysis. Regardless of the output shape type specified, the best route is always determined by the network impedance, not Euclidean distance. This means that only the route shapes are different, not the underlying traversal of the network. Along network—The output routes will have the exact shape of the underlying network sources. The output includes route measurements for linear referencing. The measurements increase from the first stop and record the cumulative impedance to reach a given position. No lines—No shape will be generated for the output routes. Straight lines—The output route shape will be a single straight line between the stops.	String
Accumulate Attributes (Optional)	A list of cost attributes to be accumulated during analysis. These accumulated attributes are for reference only; the solver only uses the cost attribute used by the designated travel mode when solving the analysis. For each cost attribute that is accumulated, a Total_[Impedance] property is populated in the network analysis output features. This parameter is not available if the network data source is an ArcGIS Online service or the network data source is a service on a version of Portal for ArcGIS that does not support accumulation.	String
Generate Directions on Solve (Optional)	Specifies whether directions will be generated. Checked—Turn-by-turn directions will be generated on solve. Unchecked—Turn-by-turn directions will not be generated on solve. This is the default. For an analysis in which generating turn-by-turn directions is not needed, leaving this option unchecked will reduce the time it takes to solve the analysis.	Boolean
Ignore Invalid Locations at Solve Time (Optional)	Specifies whether invalid input locations will be ignored. Typically, locations are invalid if they cannot be located on the network. When invalid locations are ignored, the solver will skip them and attempt to perform the analysis using the remaining locations. Checked—Invalid input locations will be ignored and only valid locations will be used. This is the default. Unchecked—All input locations will be used. Invalid locations will cause the analysis to fail.	Boolean

Derived Output

Label	Explanation	Data Type
Network Analyst Layer	The newly created network analysis layer.	Network Analyst Layer

Python

arcpy.management.MakeClosestFacilityAnalysisLayer(network_data_source, {layer_name}, {travel_mode}, {travel_direction}, {cutoff}, {number_of_facilities_to_find}, {time_of_day}, {time_zone}, {time_of_day_usage}, {line_shape}, {accumulate_attributes}, {generate_directions_on_solve}, {ignore_invalid_locations})

Name	Explanation	Data Type
network_data_source	The network dataset or service on which the network analysis will be performed. Use the portal URL for a service.	Network Dataset Layer;String
layer_name (Optional)	The name of the network analysis layer that will be created.	String
travel_mode (Optional)	The name of the travel mode that will be used in the analysis. The travel mode represents a collection of network settings, such as travel restrictions and U-turn policies, that determine how a pedestrian, car, truck, or other medium of transportation moves through the network. Travel modes are defined on your network data source. An arcpy.na.TravelMode object and a string containing the valid JSON representation of a travel mode can also be used as input to this parameter.	String
travel_direction (Optional)	Specifies the direction of travel between facilities and incidents. TO_FACILITIES—Direction of travel is from incidents to facilities. Retail stores commonly use this setting, since they are concerned with the time it takes the shoppers (incidents) to reach the store (facility). This is the default. FROM_FACILITIES—Direction of travel is from facilities to incidents. Fire departments commonly use this setting, since they are concerned with the time it takes to travel from the fire station (facility) to the location of the emergency (incident). The direction of travel may influence the facilities found if the network contains one-way streets or impedances based on the direction of travel. For instance, it may take 10 minutes to drive from a particular incident to a particular facility, but the journey may take 15 minutes traveling in the other direction, from the facility to the incident, because of one-way streets or different traffic conditions.	String
cutoff (Optional)	The impedance value at which to stop searching for facilities for a given incident in the units of the impedance attribute used by the travel_mode value. This cutoff can be overridden on a per-incident basis by specifying individual cutoff values in the incidents sublayer when travel_direction = 'TO_FACILITIES' or on a per-facility basis by specifying individual cutoff values in the facilities sublayer when travel_direction = 'FROM_FACILITIES'By default, no cutoff is used for the analysis.	Double
number_of_facilities_to_find (Optional)	The number of closest facilities to find per incident. This default can be overridden by specifying an individual value for the TargetFacilityCount property in the incidents sublayer. The default number of facilities to find is one.	Long
time_of_day (Optional)	The time and date at which the routes will begin or end. The interpretation of this value depends on whether time_of_day_usage is set to be the start time or the end time of the route. If you chose a traffic-based impedance attribute, the solution will be generated given dynamic traffic conditions at the time of day specified here. A date and time can be specified as 5/14/2012 10:30 AM. Configure the analysis to use one of the following special dates to model a day of the week or the current date instead of a specific, static date: Today—12/30/1899 Sunday—12/31/1899 Monday—1/1/1900 Tuesday—1/2/1900 Wednesday—1/3/1900 Thursday—1/4/1900 Friday—1/5/1900 Saturday—1/6/1900 Learn more about how dates and times are used and interpreted in a network analysis	Date
time_zone (Optional)	Specifies the time zone for the time_of_day parameter. LOCAL_TIME_AT_LOCATIONS—The time_of_day parameter refers to the time zone in which the facilities or incidents are located. This is the default. If time_of_day_usage is set to START_TIME and travel_direction is set to FROM_FACILITIES, this is the time zone of the facilities. If time_of_day_usage is set to START_TIME and travel_direction is set to TO_FACILITIES, this is the time zone of the incidents. If time_of_day_usage is set to END_TIME and travel_direction is set to FROM_FACILITIES, this is the time zone of the incidents. If time_of_day_usage is set to END_TIME and travel_direction is set to TO_FACILITIES, this is the time zone of the facilities. UTC—The time_of_day parameter refers to coordinated universal time (UTC). Choose this option if you want to find what's nearest for a specific time, such as now, but aren't certain in which time zone the facilities or incidents will be located.	String
time_of_day_usage (Optional)	Specifies whether the value of the time_of_day parameter represents the arrival or departure time for the route or routes. START_TIME—The time_of_day parameter value is interpreted as the departure time from the facility or incident. This is the default.When this setting is chosen, the time_of_day parameter indicates that the solver will find the best route given a departure time. END_TIME—The time_of_dayparameter value is interpreted as the arrival time at the facility or incident. This option is useful if you want to know the time to depart from a location so you arrive at the destination at the time specified in the time_of_day parameter.	String
line_shape (Optional)	Specifies the shape type that will be used for the route features that are output by the analysis. Regardless of the output shape type specified, the best route is always determined by the network impedance, not Euclidean distance. This means that only the route shapes are different, not the underlying traversal of the network. ALONG_NETWORK—The output routes will have the exact shape of the underlying network sources. The output includes route measurements for linear referencing. The measurements increase from the first stop and record the cumulative impedance to reach a given position. NO_LINES—No shape will be generated for the output routes. STRAIGHT_LINES—The output route shape will be a single straight line between the stops.	String
accumulate_attributes [accumulate_attributes,...] (Optional)	A list of cost attributes to be accumulated during analysis. These accumulated attributes are for reference only; the solver only uses the cost attribute used by the designated travel mode when solving the analysis. For each cost attribute that is accumulated, a Total_[Impedance] property is populated in the network analysis output features. This parameter is not available if the network data source is an ArcGIS Online service or the network data source is a service on a version of Portal for ArcGIS that does not support accumulation.	String
generate_directions_on_solve (Optional)	Specifies whether directions will be generated when running the analysis. DIRECTIONS—Turn-by-turn directions will be generated on solve. NO_DIRECTIONS—Turn-by-turn directions will not be generated on solve. This is the default. For an analysis in which generating turn-by-turn directions is not needed, use the default option NO_DIRECTIONS to reduce the time it takes to solve the analysis.	Boolean
ignore_invalid_locations (Optional)	Specifies whether invalid input locations will be ignored. Typically, locations are invalid if they cannot be located on the network. When invalid locations are ignored, the solver will skip them and attempt to perform the analysis using the remaining locations. SKIP—Invalid input locations will be ignored and only valid locations will be used. This is the default. HALT—All input locations will be used. Invalid locations will cause the analysis to fail.	Boolean

Derived Output

Name	Explanation	Data Type
out_network_analysis_layer	The newly created network analysis layer.	Network Analyst Layer

Code sample

MakeClosestFacilityAnalysisLayer example 1 (Python window)

Run the tool using only the required parameters.

network = "C:/Data/SanFrancisco.gdb/Transportation/Streets_ND"
arcpy.na.MakeClosestFacilityAnalysisLayer(network, "ClosestFireStations")

MakeClosestFacilityAnalysisLayer example 2 (Python window)

Run the tool using all parameters.

network = "C:/Data/SanFrancisco.gdb/Transportation/Streets_ND"
arcpy.na.MakeClosestFacilityAnalysisLayer(network, "ClosestHospitals",
                                "Driving Time", "TO_FACILITIES", 5, 3,
                                "1/1/1900 9:00 AM", "UTC", "START_TIME",
                                "ALONG_NETWORK", ["Meters", "TravelTime"])

MakeClosestFacilityAnalysisLayer example 3 (stand-alone script)

The following stand-alone Python script demonstrates how the MakeClosestFacilityAnalysisLayer function can be used to find the closest warehouse from the store locations.

# Name: MakeClosestFacilityAnalysisLayer_Workflow.py
# Description: 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))

Environments

Current Workspace