Calibrating a route

To modify the path of a route, use the Esri Roads and Highways editing activities (for example, extend route, retire route, realign route, or reassign route). To change the calibration or measure values on a route, but not the path of the route, you can edit the network's calibration point feature class. The calibration point feature class can be edited using ArcMap editing tools to add a new calibration point, edit an existing calibration point, or delete a calibration point. Roads and Highways will reflect these changes by updating the calibration (or measures) on the route.

Calibration points drive the calibration of a route and can override the digitized direction of centerlines. If you add, modify, or delete calibration points, you are telling Esri Roads and Highways explicitly what a measure value is at a specific location on the route.

Note:

This will override any interpolation of measures already existing on the route.

Route recalibration is only impacted by calibration points that have changed. The route will be recalibrated between the two calibration points to either side of the calibration point being changed. The results you see will vary depending on how far apart your calibration points are. To ensure that calibration stops at a specific location before or after the calibration point being modified, add a new calibration point at that location to lock the calibration in place.

Calibration points are time aware; this means that route calibration on a highway may change over time. When adding or modifying a calibration point, be sure to apply a time period for when that calibration point is active by setting the From Date and To Date fields. A From Date value of null means the calibration point has been effective since the highway was first created. A null To Date value means the calibration point is expected to continue to be valid into the foreseeable future.

To properly locate events along routes, Roads and Highways expects calibration points to have strictly increasing or strictly decreasing measure values along the routes. Although Roads and Highways does not prevent you from doing so, adding calibration points with measures out of sequence will improperly calibrate the route, and event data may not display properly. By applying calibration, you also cause event data to be updated. If you improperly calibrate a route by setting out-of-sequence measure values, event data with Stay Put or Snap behavior may be incorrectly updated.

In this topic you will learn how to do the following:

• Adding calibration points
• Retiring calibration points
• Moving calibration points
• Modifying calibration point measure values
• Deleting calibration points
• Saving route calibration

Adding calibration points

Roads and Highways listens for edits made in the calibration point feature class. If you add a new calibration point, Roads and Highways will attempt to apply the new calibration to whatever route it references.

See Adding new calibration points along routes using the ArcMap editing tools for more information on adding calibration points.

Steps:

1. Add a new calibration point feature by snapping to your route.
   • Create a point by copying and pasting an existing point.
     Tip:

     Copying and pasting is the easiest way to add new points. This can be done by copying an existing calibration point along the same route, moving it, and modifying its attributes; or by copying calibration points from a shapefile or other feature class and pasting them into the calibration point feature class.

   • Create a point at an exact x,y location.
   • Create a point at the end of a line you sketch.
   • Create a point at a distance and direction from a specific location.
   • Create a point at the intersection of two distances.
   • Create a point at the intersection of two segments.
   • Create a point at the midpoint of two locations.
2. Update the attributes of the new calibration points.
   1. Provide a route ID.
   2. Specify the LRS Network ID.
      Note:

      If a message appears that is related to acquiring locks, the need to reconcile, or not being able to acquire locks, Roads and Highways conflict prevention is enabled. For more information about these messages, see Conflict prevention in Roads and Highways for Desktop.

   3. Assign a measure value.
   4. Set the From Date of the calibration point.
   5. Optionally provide a To Date if you know when it was or is expected to be retired.
   6. Optionally give the point a calibration point ID.
3. Click the Apply Updates button .

   The route is recalibrated by regenerating its shape based on the updated calibration points and its measures, and event data is updated based on the event layers' Calibrate Route rules.

Retiring calibration points

Calibration points can be retired when they are no longer relevant. The original calibration point should be retired by modifying its To Date value, and a new calibration point should be added with updated measure values and/or location information and a From Date set to the effective date of the change in the route calibration.

Steps:

1. Select a calibration point.
   Note:

   If a message appears that is related to acquiring locks, the need to reconcile, or not being able to acquire locks, Roads and Highways conflict prevention is enabled. For more information about these messages, see Conflict prevention in Roads and Highways for Desktop.

2. Change the To Date attribute to the effective date of the recalibration.
3. Click the Apply Updates button .

   The existing calibration point will be retired effective as of the calibration point's To Date. The route is recalibrated by regenerating its shape based on the updated calibration point and its measures. If you set the time view of the LRS Network to an earlier date, you will see the route calibration as it was at that time. Event data will be updated according to each event layer's Calibrate Route rules.

Moving calibration points

Routes can also be calibrated by moving calibration points from one location to another along a route.

Caution:

Calibration points should only be moved if you want the change to be effective for the entire life span of the calibration point.

Steps:

1. Select a calibration point using the Edit tool on the Editor toolbar.
2. Drag the point along the route and drop it in a new location.
3. Verify the Route ID, Network ID, and measure attributes.
   Note:

   If a message appears that is related to acquiring locks, the need to reconcile, or not being able to acquire locks, Roads and Highways conflict prevention is enabled. For more information about these messages, see Conflict prevention in Roads and Highways for Desktop.

4. Click the Apply Updates button .

   The route is recalibrated by regenerating its shape based on the updated calibration points and its measures, and event data is updated based on the event layers' Calibrate Route rules.

Modifying calibration point measure values

Another way to recalibrate a route is to change the measure value of an existing calibration point.

Caution:

Calibration point measure values should only be modified if you want the change to be effective for the entire life span of the calibration point.

Steps:

1. Select a calibration point.
2. Edit the measure value.
   Note:

   If a message appears that is related to acquiring locks, the need to reconcile, or not being able to acquire locks, Roads and Highways conflict prevention is enabled. For more information about these messages, see Conflict prevention in Roads and Highways for Desktop.

3. Click the Apply Updates button .

   The route is recalibrated by regenerating its shape based on the updated calibration points and its measures, and event data is updated based on the event layers' Calibrate Route rules.

Deleting calibration points

Routes can also be calibrated by deleting calibration points.

Caution:

Deletion of calibration points is not recommended. To preserve the historical integrity of the route, obsolete calibration points should be retired instead.

Steps:

1. Select a calibration point.
2. Press the DELETE key.
   Note:

   If a message appears that is related to acquiring locks, the need to reconcile, or not being able to acquire locks, Roads and Highways conflict prevention is enabled. For more information about these messages, see Conflict prevention in Roads and Highways for Desktop.

3. Click the Apply Updates button .

   The route is recalibrated by regenerating its shape based on the updated calibration points and its measures, and event data is updated based on the event layers' Calibrate Route rules.

Saving route calibration

Route calibration and event updating is not fully implemented until you save your edits. If you don't save or stop editing without saving changes, calibration and events will roll back to their previous state. If you choose to save your changes, however, your recalibration and event updates will be applied.

Note:

If theApply Updates button was not clicked when making edits to calibration points, the edits will be applied when you save your changes.