Cartographic realignment

The activity of updating the route geometry based on aerial imagery, as-built drawings, or input from field data collectors in a manner that does not change measures can be achieved by direct modifications to the centerline. This is known as cartographic realignment. Esri Roads and Highways allows you to change the shape of centerlines and preserve the calibration of the underlying routes as they existed before the cartographic realignment was applied. The results are achieved by editing the geometry of the centerlines that are associated to the route.

Note:

You need the centerline feature class visible in the table of contents to do cartographic realignment.

1. Start ArcMap.
2. Set up the editing environment to use Roads and Highways.
3. Use the ArcMap navigation tools to zoom to the location of the alignment change.

   

4. Uncheck the network layer in the table of contents.
5. Check the Centerline layer in the table of contents.
6. Click the Edit tool on the Editor toolbar and click the feature.
7. Double-click the centerline's edge.

   The selected centerline's vertices appear.

   

8. Edit the vertices of the selected centerline to match the correct alignment of the route.

   You can do this by adding and deleting the vertices and by modifying segments. You can also use the geometry editing tools available in ArcGIS for Desktop.

   

   Note:

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

   • If a centerline is shared by concurrent routes in the same network, routes from a different time span, or routes from a different network, all those routes need to be locked to perform the cartographic realignment.
9. After editing the vertices to match the proposed alignment of the route, right-click anywhere on the map and click Finish Sketch.

   

   Note:

   If an elevation model is configured with the ALRS, the z-values on the centerline being edited will be updated using the elevation model. To configure an elevation model with the ALRS, see step 14 in Creating a new ALRS.

10. Check the network layer in the table of contents.

    The route is now cartographically realigned.

    

    Note:

    • After centerlines are updated, the route shapes in all networks are also updated. However, the event shapes for internal events and locations of the Roads and Highways managed intersections are not updated until you click the Apply Updates button on the Roads And Highways Editing toolbar or save your edits. For more information, see Updating event shapes.
    • The intersections will be updated only when any referent offset events are present in the ALRS. These referent offset events should have the Honor Referent Location event behavior set up for cartographic realignment.

      

    • In case you do not have any referent offset events in the ALRS and want to update the intersections on the basis of the cartographic realignment, you can use the tools discussed in Updating an LRS intersection class and Update intersection points to do so.
    • It is also important to note that when the centerlines are edited, all routes in all networks, across all times, are modified accordingly.
    • If there exists a calibration point in the cartographic realignment section, then, you have an option to either delete or proportionally snap the affected calibration point to the new realignment.

      

When the route's geometry is cartographically realigned to increase or decrease in length, the resulting alignment will follow the geometrical length of the centerline if you have selected the option on the Roads And Highways Editing dialog box. To do so, right-click the LRS Network in ArcCatalog and click Properties, and then click the Calibration tab.

In the figure below, a cartographic realignment was performed on the route. The measure length of the route increased as a product of the realignment. Checking the option described above (right) will result in recalibration of the route by updating the measure length. If you keep the option unchecked (left), the route will not be recalibrated and the measures will remain the same as they were before the cartographic realignment.