Modifying shared line events when one is completely selected

Some linear events, such as pavement conditions and speed limits, are used to describe route attributes that exist continuously along the route. While every location along the route has a pavement condition, the condition may not be the same along the entire length of the route. The Modify Shared Line Event tool allows you to adjust the value in the to- or from-measure field to ensure two events are contiguous, without overlaps or gaps. The tool can also be used to extend one event along a route and automatically adjust an adjacent event to maintain the coincidence of their endpoints.

When selecting the two line events you want to modify, one of the line events may be completely contained within the selection envelope.

Example of an envelope around two events, with one completely selected

When this happens, you are asked to choose which end of the contained feature is the shared end that you want to modify. As you select the From or To measure from the dialog box, it flashes in the map to help you choose which endpoint to use.

If the endpoint you choose does not have the same measure as the endpoint of the other feature, you are prompted to choose whether or not to make the two events coincident on the route.

For example, you might have a poor and a good pavement event in your data where the from-measures of both events are in the same location. Perhaps the poor event overlaps part of the good event and you want to make them continuous rather than overlapping. When you select the line events, the selection envelope contains the entire poor event and the from-point of the good event. You are then prompted to choose which end of the poor event to use, and you can choose the To measure. When you choose the location where the two events meet, both records are updated. The from-measure of the good event will have the same values as the to-measure of the poor event, so they will now be continuous along the route rather than overlapping.

Example of overlapping events made coincident

  1. Start ArcMap.
  2. Load event features in the table of contents.

    When working with joins and event layers, make sure you add the event layer before you perform the join to ensure that edits to the event layer are performed correctly. If you join the event table before adding it as an event layer, you cannot update the attributes of the event while editing, and some of the event editing may not work.

  3. On the main menu, click Customize > Toolbars > Production Editing.
  4. On the main menu, click Customize > Toolbars > Production Linear Referencing.
  5. Click the Production Start Editing button Production Start Editing on the Production Editing toolbar.

    The Manage Features and Create Attributes, Update Attributes, or Metadata Attributes windows automatically appear when you start an edit session using the Production Start Editing tool.


    If the Create Attributes, Update Attributes, or Metadata Attributes window does not appear when you start an edit session, click the Show/Hide Attributes button Show/Hide Attributes on the Manage Features window.

  6. Click the Modify Shared Line Event button Modify Shared Line Event on the Production Linear Referencing toolbar.
  7. Click the Select Route Events tool Select Route Events Tool on the Production Linear Referencing toolbar.
  8. Select two events in the map.

    If an entire event is included in the selection, the Modify Shared Event End Points dialog box appears.

    Modify Shared Event End Points dialog box

  9. Choose the measure you want to use to modify the shared line events.

    The common point between the two events is displayed as a red box. If the measure you chose is not at the same location as the measure from the other selected feature, you are prompted to make the two endpoints coincident.

  10. Click and drag the box to where you want the first event to end and the second one to begin, then click the line.

The value of the to-measure field is updated for one event, and the value of the from-measure field is updated for the other event. Both events are redrawn in the map to reflect the new values.

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