Derive Event Measures (Location Referencing)

Summary

Populates and updates the DerivedRouteID field and measure values on point and line events with those fields configured and enabled.

Usage

• An LRS dataset is required to run this tool. To create an LRS dataset, add the calibration point, centerline, and redline layers to a feature dataset; then run the Modify LRS tool with the geodatabase as the input.

• This tool is designed to be executed as part of a larger workflow. Run the Apply Event Behaviors and Generate Routes tools before executing Derive Event Measures. Running this tool without running the previous tools in the workflow may result in inaccurate data.

• It is recommended that you run this tool on the file geodatabase at initial migration of the data. It will run faster this way because the operation must modify each event record in the database. Once in production, the tool can be run on a selection set of the routes that have been modified to significantly reduce execution time.

• The input event feature layer must have DerivedRouteID and measure fields configured.

• This tool can be run on one, multiple, or all events in a line network.

• When conflict prevention is enabled, the following are supported:

  • The events whose derived event measures need to be updated will automatically acquire event locks, if available. If the locks cannot be acquired, the tool will fail and provide the text file of those locks.

    Learn more about conflict prevention in Pipeline Referencing or conflict prevention in Roads and Highways.

  • While working in the default version, the acquired locks will be released automatically when the tool completes.
  • While working in a child version, the acquired locks will remain in post status when the tool completes. The user must post or delete the version to release the locks.
  • While working in a child version, if the execution of the tool is canceled by interruption, the acquired locks will remain in releasable status.

• This tool supports conflict prevention and will attempt to acquire and transfer locks.

  Learn more about conflict prevention in ArcGIS Pipeline Referencing or conflict prevention in ArcGIS Roads and Highways.

Parameters

Dialog

Label	Explanation	Data Type
Input Route Features	The LRS Network containing the events with DerivedRouteID and measure fields configured.	Feature Layer
Update all event feature classes registered in the selected network (Optional)	Specifies whether all event feature classes in the network will be updated. Checked—All event feature classes in the network selected in the Input Route Features parameter value will be updated. This is the default. Unchecked—All event feature classes in the network selected in the Input Route Features parameter value will be not be updated. Individual event layers can be selected using the Event Layers parameter.	Boolean
Event Layers (Optional)	The event layers that will have DerivedRouteID and measure fields updated.	Feature Layer

Derived Output

Label	Explanation	Data Type
Output Events	The updated events feature layer.	Feature Layer
Output Details File	The text file that details changes made to the events feature layer. Note: Validation results for this tool are written to the ArcGIS Server directory. This file is automatically cleaned up in 10 minutes by default, which may not be enough time to process all of the validations and write them to your workstation that is running ArcGIS Pro. For larger data loads, it is recommended that you adjust the maximum file age to at least one hour.	Text File

Python

arcpy.locref.DeriveEventMeasures(in_route_features, {update_all_events}, {event_layers})

Name	Explanation	Data Type
in_route_features	The LRS Network containing the events with DerivedRouteID and measure fields configured.	Feature Layer
update_all_events (Optional)	Specifies whether all event feature classes in the network will be updated. UPDATE_ALL—All event feature classes in the network selected in the in_route_features parameter value will be updated. This is the default. UPDATE_SOME—All event feature classes in the network selected in the in_route_features parameter value will not be updated. Individual event layers can be selected using the event_layers parameter.	Boolean
event_layers [event_layers,...] (Optional)	The event layers that will have DerivedRouteID and measure fields updated.	Feature Layer

Derived Output

Name	Explanation	Data Type
out_events	The updated events feature layer.	Feature Layer
out_details_file	The text file that details changes made to the events feature layer. Note: Validation results for this tool are written to the ArcGIS Server directory. This file is automatically cleaned up in 10 minutes by default, which may not be enough time to process all of the validations and write them to your workstation that is running ArcGIS Pro. For larger data loads, it is recommended that you adjust the maximum file age to at least one hour.	Text File

Code sample

DeriveEventMeasures example 1 (Python window)

The following Python window script demonstrates how to use DeriveEventMeasures in immediate mode.

# Name: DeriveEventMeasures_ex1.py
# Description: Populate and update the Derived RouteID and measure values on point and line events with those fields configured and enabled.
# Requires: ArcGIS Location Referencing

# Check out license
arcpy.CheckOutExtension("LocationReferencing")

# Local variables
in_route_features = r'C:\Data\PipelineReferencing.gdb\LRS\LineNetwork'
update_all_events = "UPDATE_SOME"
event_layers = "Casing, Coating"

# Set current workspace
arcpy.env.workspace = "C:\Data\PipelineReferencing.gdb"

# Execute the tool
arcpy.locref.DeriveEventMeasures(in_route_features, update_all_events, event_layers)

# Check in license
arcpy.CheckInExtension('LocationReferencing')

DeriveEventMeasures example 2 (stand-alone script)

The following stand-alone Python script demonstrates how to use the DeriveEventMeasures function.

# Name: DeriveEventMeasures_ex2.py
# Description: Populate and update the Derived routeID and measure values on point and line events with those fields configured and enabled.
# Requirements: ArcGIS Location Referencing

# Import arcpy module
import arcpy

# Check out license
arcpy.CheckOutExtension("LocationReferencing")

# Local variables
in_route_features = r'C:\Data\PipelineReferencing.gdb\LRS\LineNetwork'
update_all_events = "UPDATE_ALL"
event_layers = ""

# Execute the tool
arcpy.locref.DeriveEventMeasures(in_route_features, update_all_events, event_layers)

# Check in license
arcpy.CheckInExtension('LocationReferencing')

DeriveEventMeasures example 3 (stand-alone script)

The following stand-alone Python script demonstrates how to use the DeriveEventMeasures function in a feature service.

# Name: DeriveEventMeasures_Pro_Ex3.py
# Description: Populate and update Derived RouteID and measure values on point and line events with those fields configured and enabled.
# Requires: ArcGIS Location Referencing

# Import arcpy module.
import arcpy

# Check out license
arcpy.CheckOutExtension("LocationReferencing")

## Input LRS Route Network is in feature service. Portal signin is required to access the feature service.
arcpy.SignInToPortal('https://yourdomain.com/portal', 'username', 'password')

## Map the input route network from the feature service. Here, 3 corresponds to the input route network.
in_lrs_network = r"https://yourdomain.com/server/rest/services/FeatureServiceName/FeatureServer/3"

# Set tool variables.
update_all_events = "UPDATE_ALL"
event_layers = ""

# Process : Derive Event Measures.
arcpy.locref.DeriveEventMeasures(in_lrs_network, update_all_events, event_layers)

# Check in license
arcpy.CheckInExtension('LocationReferencing')

Environments

Current Workspace

Licensing information

• Basic: Requires ArcGIS Location Referencing
• Standard: Requires ArcGIS Location Referencing
• Advanced: Requires ArcGIS Location Referencing