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, and 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. The Apply Event Behaviors and Generate Routes tools should be run 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 against the file geodatabase at initial migration of the data. It will run faster this way because the operation must modify every single event record in the database. Once in production, the tool can be run on only 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 against 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 offending locks. For more information, see Conflict prevention.
- While working in the default version, the acquired locks are 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.

Syntax

Parameter	Explanation
in_route_features	The LRS Network containing the events with DerivedRouteID and measure fields configured.
update_all_events (Optional)	Determines whether all event feature classes in the network will be updated. Checked—Updates all events in the network selected in Input Route Features. This is the default. Unchecked—Does not update all events in the network selected in Input Route Features. Allows the user to select individual event layers in the event layers parameter below.
event_layers (Optional)	The event layers that will have DerivedRouteID and measure fields updated.

Parameter

Explanation

in_route_features

The LRS Network containing the events with DerivedRouteID and measure fields configured.

update_all_events (Optional)

Determines whether all event feature classes in the network will be updated.

Checked—Updates all events in the network selected in Input Route Features. This is the default.
Unchecked—Does not update all events in the network selected in Input Route Features. Allows the user to select individual event layers in the event layers parameter below.

event_layers (Optional)

The event layers that will have DerivedRouteID and measure fields updated.

Code Samples

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

# Import arcpy module
import arcpy

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

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

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

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

# Name: DeriveEventMeasures_ex2.py
# Description: Populates/Updates the Derived RouteID and measure values on point and line events with those fields configured and enabled.
# Requirements: ArcGIS Pipeline Referencing

# Import arcpy module
import arcpy

# Check out any necessary licenses
arcpy.CheckOutExtension("LocationReferencing")

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

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

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

# Name: DeriveEventMeasures_Pro_Ex3.py
# Description: This script demonstrates how to use derive event measures in stand alone mode using feature service. It is recommended to work in a version and post it into the default version.
# Requires: LocationReferencing license

# Import arcpy module.
import arcpy

# Check out any necessary licenses.
arcpy.CheckOutExtension("LocationReferencing")


## Input LRS Route Network is in feature service.  Signing in portal 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"

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


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

Derive Event Measures (Location Referencing)

Title Derive Event Measures (Location Referencing)

Summary

Usage

Syntax

Code Samples

Tags

Credits

Use limitations